Developer tools and APIs for building with AI

Scan a .env file for exposed API keys, high-entropy secrets and insecure defaults, with key patterns for OpenAI, Anthropic, AWS, Stripe and GitHub.

Developer utilities

Generate a .gitignore by combining templates for Node, Python, Java, Go, Rust, Docker, macOS, VS Code and JetBrains, with unknown stacks reported.

Developer utilities

Merge Base, Theirs and Mine versions of a text with a diff3 three-way merge, resolve each conflict by side, and copy or download the result.

Developer utilities

Validate skill definitions across OpenClaw, Claude, Codex, and MCP with portability scoring and exact fixes

AI tools

Map tool capability blast radius, score operational risk, and produce least-privilege policy buckets

AI tools

Inspect AI agent traces from LangChain runs, OpenAI Assistants run steps or a JSON step array, with LLM calls, tool calls, errors, timings and tokens.

AI tools

Generate an AGENTS.md for coding agents from Node, Python, Go or monorepo presets, with setup, build, test and lint commands and done criteria.

AI tools

Simulate multi-agent LLM costs with per-turn context growth and tool-call overhead, compare against a single agent and project monthly spend.

AI tools

Compare AI agent frameworks such as LangChain, CrewAI, AutoGen and Mastra by language, GitHub stars, multi-agent, tool, RAG and MCP support.

AI tools

Decode an error response from the OpenAI, Anthropic, Gemini, Mistral or Cohere API into its cause, a Python and Node.js fix and a retry strategy.

AI tools

Identify an AI API key's provider from its prefix (Anthropic, OpenAI, OpenRouter, Groq, Google AI, xAI and more) and check its format locally.

AI tools

Generate Node or Python CLI scaffolds from OpenAPI with auth wiring, retries, pagination, and shell completion stubs

Developer utilities

Scan code for AI-generated anti-patterns: hallucinated imports, over-abstraction, verbose error handling, redundancy, security smells and AI tells.

AI tools

Visualize how your AI model's context window is allocated across system prompt, tools, conversation, and RAG

AI tools

Estimate monthly or annual LLM API costs per model from workload presets, request volume, token counts and prompt-cache hit rate.

AI tools

Score Markdown docs on structure, code examples, API discoverability, schema coverage, LLM parseability and readability, with fixes ranked by impact.

AI tools

Write keyword and regex guardrail rules that block, flag or redact text, test them against sample inputs and outputs, and export them as JSON.

AI tools

Compare AI models side by side: pricing, context windows, max output, and release dates

AI tools

Answer 7 questions and get personalized AI model recommendations across GPT, Claude, Gemini, Grok, DeepSeek, and open-weight models

AI tools

Track deprecation and shutdown dates for API models from OpenAI, Anthropic, Google, xAI and others, with each replacement and its breaking changes.

AI tools

Calculate daily, monthly and yearly LLM API costs per model from your request volume and average input and output tokens.

AI tools

Check a system prompt's defenses against known injection patterns: role hijacking, instruction override, delimiter abuse, encoding tricks, jailbreaks.

AI tools

Compare two to four prompt variants side by side with word-level diffs, token estimates and the {{variables}} each one uses.

AI tools

Compare up to four LLM responses side by side, with line or word diffs and an analysis of length, shared sentences and content unique to each.

AI tools

Lint CLAUDE.md, .cursorrules, and copilot-instructions files for redundancy, conflicting instructions, missing sections, and token efficiency.

AI tools

Paste text to estimate its tokens and compare input and output cost across GPT, Claude, Gemini and other catalog models, with CSV export.

AI tools

Build AI tool definitions in a visual editor with typed, enum and nested parameters, and export them as OpenAI, Anthropic, MCP or JSON Schema.

AI tools

Decode an Anthropic Messages SSE stream into text, thinking and tool_use blocks, stop_reason and token usage including cache writes and reads.

AI tools

Build HTTP requests visually and generate code for cURL, fetch, axios, and Python with headers, auth, and query params

Developer utilities

Generate random test API keys in generic, OpenAI-style, Anthropic-style or GitHub-style formats with a custom prefix and length.

Developer utilities

Set a mock response's status, headers, JSON body and delay, then copy it as a fetch() mock, MSW handler, Express route, curl command or Python mock.

Developer utilities

Turn up to 20 characters of text into ASCII art banners in 10 FIGlet-style fonts for README files, terminal output and code comments.

Generators

Simplify a width and height to an aspect ratio, scale dimensions with a ratio lock, and copy the CSS aspect-ratio value, with common presets.

Developer utilities

Split an AWS ARN into partition, service, region, account, resource type and ID, or build one from fields, with formats for 11 common services.

Developer utilities

Analyze an AWS IAM policy for wildcard actions and resources, privilege-escalation paths, public principals and missing conditions, with a risk score.

Developer utilities

Encode text to Base64 or decode Base64 back to text, with UTF-8 handling and a URL-safe base64url option.

Converters

Encode a username and password into an HTTP Basic Authorization header or curl -H flag, or decode a Basic token back to plaintext credentials.

Developer utilities

Generate bcrypt password hashes with an adjustable cost factor and verify a password against an existing hash, using the bcryptjs library.

Developer utilities

Build a biome.json for Biome's formatter and linter with rule-group severity, import sorting and VCS ignore, plus an ESLint+Prettier comparison.

Generators

Build bunfig.toml and Bun package.json scripts from six presets, and scan Node code for APIs that behave differently under Bun, like vm and cluster.

Generators

Convert between bytes and PB in decimal (KB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) units, with bit counts and transfer times at common speeds.

Converters

Build an HTTP Cache-Control header from presets or individual directives, with a plain-language explanation and warnings for conflicting directives.

Generators

Build a multi-site Caddy v2 Caddyfile with reverse_proxy, file_server, redir, header and tls, plus snippets, named matchers and dev or prod globals.

Generators

Turn a list of commit subjects into a Markdown changelog grouped into breaking changes, features, fixes, performance, docs and chores.

Generators

Convert chat request JSON between OpenAI Chat Completions, Anthropic Messages, Gemini and Mistral, remapping roles, system prompts, tools and images.

Converters

Convert Unix permissions between numeric modes like 755 and symbolic rwx notation with a checkbox grid, setuid, setgid and sticky bits, and presets.

Developer utilities

Simulate Claude hook decisions for pre/post tool events and validate policy rule coverage before rollout

AI tools

Diff managed, user, project, and local settings scopes and compute the effective merged Claude configuration

AI tools

Generate CLAUDE.md, .cursorrules, copilot-instructions.md, .windsurfrules and .clinerules files from one form or a stack template.

AI tools

Audit your CLI --help output for discoverability, flag consistency, examples, and error guidance

Developer utilities

Pack code files into an LLM prompt under a token budget with per-file truncation (full, signatures, first N lines) and XML, Markdown or plain output.

AI tools

Check the WCAG 2.1 contrast ratio between a text and background color in hex, rgb() or hsl(), with AA and AAA results for normal and large text.

Developer utilities

Convert colors between HEX, RGB, HSL, HSV, CMYK, and Tailwind CSS with contrast checker

Converters

Generate color palettes from a base color with six harmony rules, lock colors, check contrast, and export CSS, SCSS, Tailwind or JSON.

Generators

Edit CSS @container breakpoints, resize the parent by slider or drag handle to watch a component reflow, and copy the named-container CSS.

Developer utilities

Diagnose a browser CORS error from its message and the response headers, and get the missing Access-Control headers plus an Express fix.

Developer utilities

Build and validate cron expressions with plain-English descriptions, next-run previews and an optional seconds field. Also available as a REST API.

Developer utilities

Test 5- or 6-field cron expressions, see upcoming run times in your timezone, and turn phrases like 'weekdays at 9am' into cron.

Developer utilities

Build strict CSP header templates and SRI tag snippets for frontend script hardening and safer deployments

Developer utilities

Build a CSS @keyframes animation from bounce, fade, slide, pulse or shake presets, set duration, delay, easing and fill mode, and copy the CSS.

Generators

Create layered CSS box shadows with sliders for offset, blur, spread, color, opacity and inset, start from presets, and copy the CSS.

Generators

Generate a CSS clamp() value for fluid typography or spacing from min and max sizes and a viewport range, with a live preview that scales.

Generators

Experiment with CSS Flexbox and Grid layouts using visual controls, a live preview and per-item settings, then copy the generated CSS.

Generators

Create linear, radial and conic CSS gradients with multiple color stops, angle and shape controls and presets, then copy the CSS.

Generators

Visually compose grid-template-columns, rows, and named areas. Click cells to paint regions and copy minimal CSS plus matching Tailwind utility classes.

Generators

Minify or beautify CSS with size reduction stats and comment removal options

Formatters

Calculate and visualize CSS selector specificity. Paste selectors to see specificity scores, compare multiple selectors, and understand which styles win.

Developer utilities

Build and preview CSS text-shadow effects interactively. Stack multiple shadow layers, use presets like neon or retro, and copy the ready-to-use CSS.

Generators

Convert vanilla CSS to Tailwind CSS utility classes with property mapping and spacing scale conversion

Converters

Convert between CSS units: px, rem, em, vw, vh, %, and pt. Bidirectional with configurable base font size and viewport dimensions.

Converters

Convert between CSV and JSON with auto-delimiter detection and proper escaping

Converters

Turn CSV into mock JSON API responses, an OpenAPI 3.1 spec, and Cloudflare Worker, Express or FastAPI endpoint code with pagination.

Developer utilities

Edit a CSS cubic-bezier() easing curve by dragging control points or typing values, start from presets like ease-in-out or back, and preview it.

Generators

Convert cURL commands to JavaScript fetch, Axios, Python requests, Node.js http, PHP, and Go. Supports headers, JSON body, form data, and auth.

Converters

Generate .cursorrules, .windsurfrules, .clinerules, CLAUDE.md or Copilot instructions from your stack, conventions, testing approach and rules.

AI tools

Parse or build PostgreSQL, MySQL, MongoDB, Redis and SQL Server connection strings, with masked and URL-encoded variants and SSL and password checks.

Developer utilities

Scope Deno --allow-* flags (read, write, net, env, run, sys, ffi, import), see a risk score, and copy the deno run command or deno.json tasks.

Generators

Generate diceware passphrases from an embedded 1,296-word list with crypto.getRandomValues, choosing word count, separator and capitalization.

Generators

Parse dig answer lines into structured A, AAAA, CNAME, MX, TXT and NS records with host, TTL and value, and flag TTLs longer than 24 hours.

Developer utilities

Validate Docker Compose YAML for syntax errors, unknown keys, port and volume syntax, missing or circular depends_on, and undeclared networks.

Developer utilities

Generate a starter Dockerfile for Node, Python or Go with a slim or Alpine base image, a non-root user and your start command.

Developer utilities

Lint a Dockerfile with hadolint-style rules for latest tags, apt-get, root user, ADD vs COPY, cache order and HEALTHCHECK, with a score and fixes.

Developer utilities

Convert Drizzle ORM schemas to Prisma and back, with parity reports for tables, columns, relations, and indexes.

Converters

Generate a .editorconfig with a root [*] section and per-glob overrides for indent style and size, charset, line endings and trailing whitespace.

Generators

Compare two embedding vectors by cosine similarity, dot product, Euclidean and Manhattan distance, with dimension hints for common embedding models.

AI tools

Parse, validate, edit, and convert .env files between JSON, YAML, Docker, and Shell formats

Developer utilities

Validate a .env file against .env.example and catch missing variables, empty values and type mismatches.

Developer utilities

Generate .env.example templates with secrets stripped, plus Markdown variable docs, from framework presets, Docker Compose or Kubernetes configs.

Developer utilities

Generate .env, .env.example and Markdown docs from Docker Compose files, Kubernetes manifests, a custom list or presets for eight frameworks.

Developer utilities

Build an ESLint 9 eslint.config.js from TypeScript, React, Vue and Node presets with custom rules and file overrides, or migrate a legacy .eslintrc.

Generators

Build a golden eval dataset of prompt, expected, category and tag rows, remove duplicates, check category balance, and export to four eval formats.

AI tools

Scan Chrome extension permissions for security risks with risk scoring, dangerous combination detection, and plain-English explanations

Developer utilities

Generate favicons from text or emoji in all standard sizes with HTML and PWA manifest snippets

Generators

Validate OpenAI or Anthropic fine-tuning JSONL row by row for schema, role order, token counts and duplicates, with per-row issues and summary stats.

AI tools

Detect whether text is JSON, YAML, XML, CSV, TOML, INI or a Markdown table, with confidence scores, and convert it. Also available as a REST API.

Converters

Script a multi-step tool-calling conversation with mock tool results and errors, then export it as an OpenAI or Anthropic request body.

AI tools

Generate Conventional Commits messages with a type, optional scope, body, BREAKING CHANGE footer and issue references, with a subject length check.

Generators

Paste a git diff and see token counts per file, cost across AI models for code review, and chunking suggestions when diffs exceed context limits.

AI tools

Generate a .gitattributes file for line-ending normalization, binary files, Git LFS tracking and GitHub Linguist overrides.

Generators

Build GitHub Actions workflow YAML from a form, with Node, Python, Docker and Cloudflare Pages templates, matrix builds and cache steps.

Developer utilities

Test glob patterns against file paths with *, **, ?, bracket classes, {a,b} braces and negated patterns, plus a pattern-by-path match matrix.

Developer utilities

Build a GraphQL query or mutation from an operation name, dot-notation field paths and typed variables, with nested selections written for you.

Developer utilities

Parse a GraphQL SDL schema and browse its types, fields, arguments and references, with search and checks for undefined types.

Developer utilities

Analyze a HAR file with a request waterfall, blocking time, third-party breakdown by host, slow requests, headers, total transfer size and wall time.

Developer utilities

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text or files

Developer utilities

Diff Helm values.yaml for dev, staging and prod side by side as dotted paths, with added, removed and changed keys and which environments set each.

Developer utilities

Compute an HMAC with SHA-1, SHA-256, SHA-384 or SHA-512 in hex or base64, and reproduce GitHub, Stripe and Slack webhook signature headers.

Developer utilities

Detect zero-width characters, bidi overrides, non-ASCII spaces and Cyrillic or Greek look-alike letters in text or code, and copy a sanitized version.

Developer utilities

Generate an Apache .htaccess file with redirects, mod_rewrite rules, forced HTTPS, security headers, caching, compression and IP blocking.

Generators

Encode text to HTML entities (reserved characters, all special characters or all non-ASCII) or decode entities, with a searchable entity table.

Converters

Format or minify HTML with adjustable indentation, preview the rendered page, and flag unclosed tags, duplicate IDs and missing alt text.

Formatters

Convert HTML to JSX with automatic attribute renaming, style objects, self-closing tags, and comment conversion

Converters

Build a Set-Cookie header and matching document.cookie line with Secure, HttpOnly, SameSite, Path, Domain, Expires, Max-Age and Partitioned.

Developer utilities

Score pasted HTTP response headers on five security headers and summarize CORS and caching headers such as Access-Control-Allow-Origin and ETag.

Developer utilities

Look up HTTP status codes from 100 to 511 by number or keyword, with a description, details and typical use cases for each.

Developer utilities

Convert PNG, JPG, GIF, WebP, and SVG images to Base64 encoding with data URI, CSS, and HTML formats

Converters

Calculate IPv4 subnets, CIDR ranges, network addresses, and host counts with a visual binary breakdown

Developer utilities

Expand, compress and validate IPv6 addresses, including embedded IPv4, with hex and binary forms and the network and address count of a CIDR.

Developer utilities

Minify JavaScript by stripping comments and whitespace, or beautify it with 2-space, 4-space or tab indentation, and see the size saved.

Formatters

Format, validate and minify JSON with 2-space, 4-space or tab indents, alphabetical key sorting and line-numbered parse errors.

Formatters

Generate an RFC 6902 JSON Patch of add, remove and replace operations that turns a source JSON document into a target document.

Developer utilities

Generate a valid example JSON payload from a JSON Schema, honoring types, enums, required fields, formats, bounds and local $ref references.

AI tools

Generate Draft-07 or 2020-12 JSON Schemas from sample JSON for function calling, structured outputs and validation. Also available as a REST API.

AI tools

Sort JSON keys A-Z or Z-A, remove nulls and empty values, deduplicate arrays, strip keys, and flatten or unflatten nested objects in one pass.

Developer utilities

Convert JSON to idiomatic Go struct definitions with json tags, nested structs, omitempty, and pointer options

Converters

Convert JSON to Kotlin data classes for kotlinx.serialization, Gson or Moshi, with nested classes and optional nullable fields.

Converters

Convert JSON to Python dataclass or TypedDict definitions with type hints, nested classes, and Optional types

Converters

Convert JSON to Rust structs with Serde Serialize and Deserialize derives, rename_all options, Option<T> for nulls and pub fields.

Converters

Convert JSON to TypeScript interfaces or type aliases with nested types, union types for mixed arrays, and optional or readonly fields.

Converters

Convert JSON to Zod schema definitions with optional/required inference, coerce mode, and nested schema support

Converters

Test JSONPath expressions against JSON as you type, with filters and recursive descent, click-to-path on a JSON tree, and examples.

Developer utilities

Decode JSON Web Tokens to inspect the header, algorithm, standard and custom claims, readable timestamps and expiration status.

Developer utilities

Build and sign a JSON Web Token with HS256, HS384 or HS512 from an editable header and claims, with an exp shortcut and an expiry readout.

Developer utilities

Validate Kubernetes YAML for 14 kinds against an embedded schema: required fields, apiVersion, image tags, resource limits, probes, security context.

Developer utilities

Generate macOS launchd plist XML for LaunchAgents with KeepAlive, StartInterval or StartCalendarInterval schedules and the launchctl commands.

Generators

Check whether open source licenses such as MIT, Apache-2.0, GPL, LGPL, MPL and AGPL can be combined, with per-pair verdicts and an outbound license.

Developer utilities

Validate robots.txt and llms.txt files, detect conflicts, simulate AI bot access, and export corrected policies

AI tools

Build an LLM-as-judge rubric with weighted criteria on Likert, pass/fail, percentage or 0/1 scales, then export YAML, JSON and a judge prompt.

AI tools

Estimate time to first token, generation time and total latency for current LLMs from your token counts, with a UX pattern for each wait.

AI tools

Compare two to four LLM outputs side by side, diff any pair by line or by word, and compare response length in characters and words.

AI tools

Validate LLM JSON output against a JSON Schema, with OpenAI, Anthropic and MCP presets, per-field fixes and sample output. Also has a REST API.

AI tools

Count tokens for GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Qwen and Muse models and estimate API cost. Also available as a REST API.

AI tools

Price a multi-step LLM pipeline (embed, retrieve, generate, validate) per run, day and month, with cached-input rates and a provider comparison.

AI tools

Generate an llms.txt file with an H1, summary blockquote and Markdown link sections, or validate an existing one for structure and absolute URLs.

AI tools

Parse logs with auto-detection of JSON Lines, Python logging, syslog and nginx access formats, then filter by level and search.

Formatters

Generate lorem ipsum placeholder text as paragraphs, sentences or words, from classic Latin, hipster or plain English word lists.

Generators

Build markdown memory files for AI agents from guided forms: SOUL.md, USER.md, AGENTS.md, daily logs, decision records, project status and lessons.

AI tools

Preview Markdown as rendered HTML while you type, with tables, fenced code blocks, strikethrough and images, and copy the HTML.

Formatters

Edit a table in a spreadsheet-style grid and copy it as a Markdown table, with column alignment, padded output and CSV or Markdown import.

Generators

Convert Markdown to HTML with GFM tables and strikethrough, a live preview and a full HTML page download. Also available as a REST API.

Converters

Generate a nested Markdown table of contents from your headings with GitHub- or GitLab-style anchor links, skipping headings in code fences.

Generators

Compose managed MCP governance packs with allow/deny lists, approval boundaries, and operator rollout checklists

AI tools

Audit an MCP server config for risky capabilities, dangerous combinations such as file read plus network, risk scores and least-privilege fixes.

AI tools

Generate MCP server configurations for Claude Desktop, Cursor, and Windsurf with visual editor and presets

AI tools

Browse and search Model Context Protocol (MCP) servers by category, with GitHub stars, transport type and copyable install commands.

AI tools

Generate a runnable MCP server project in TypeScript, Python or Go with tools, resources, prompts, stdio or HTTP transport and optional auth.

AI tools

Simulate context-window usage for full MCP tool injection versus search-first retrieval strategies

AI tools

Validate a WebMCP tool definition's name, description and inputSchema, generate a test form from the schema, and mock a call locally.

AI tools

Render Mermaid flowchart code as a diagram with live preview, subgraphs, light or dark theme, and SVG or PNG export.

Developer utilities

Generate SEO meta tags with live Google, Facebook, and Twitter card previews

Generators

Generate UUIDv7, ULID and NanoID identifiers in bulk with crypto.getRandomValues, and decode the timestamp inside a UUIDv7 or ULID.

Generators

Visually compose Mock Service Worker REST and GraphQL handlers with matchers, response shapes, delays, and one-shot semantics. Exports MSW v2 handlers.ts.

Generators

Parse and view JSONL (newline-delimited JSON) with interactive table, filtering, sorting, and export

Developer utilities

Generate nginx configurations for reverse proxy, SSL, static sites, and load balancers with security headers

Generators

Convert between hex, binary, decimal, and octal with bit visualization and bitwise operations

Converters

Build an OAuth 2.0 authorization code URL with a random state value, or a token exchange cURL command for the code you get back.

Developer utilities

Convert chat messages, tool definitions and responses between the OpenAI and Anthropic API formats in either direction, with format auto-detection.

Converters

Render OpenAPI 3.x and Swagger 2.0 specs in JSON or YAML as API docs with endpoints grouped by tag, parameters and schemas.

Developer utilities

Diff two OpenAPI JSON specs and list added, removed and changed endpoints by method and path as a Markdown changelog.

Developer utilities

Convert an OpenAPI 3.x JSON spec into MCP tool definitions, one per endpoint, and export config JSON or a TypeScript or Python server.

Converters

Generate TypeScript types and an optional typed fetch client from an OpenAPI 3.0 or 3.1 spec in JSON or YAML, with $ref, allOf and oneOf support.

Converters

Scan SKILL.md instructions for destructive command patterns, missing safety boundaries, and trust posture

AI tools

Lint OpenProse flow graphs for unreachable stages, dangling edges, privileged paths, and approval gaps

Developer utilities

Visualize OpenTelemetry traces (OTLP JSON or Jaeger) as a waterfall flame graph with span attributes, errors, and per-service summaries.

Developer utilities

Generate a package.json scaffold for an app with Vite scripts or a library with tsc and Vitest scripts, set to ESM with type: module.

Developer utilities

Generate strong, cryptographically secure passwords with customizable length, character sets, and entropy meter

Generators

Generate placeholder images at any width and height with custom colors, label and font size, as a PNG download, data URL or img tag.

Generators

Test getByRole, getByText, getByLabel, getByPlaceholder, CSS or XPath Playwright locators on pasted HTML, with match count and a stability score.

Developer utilities

Build a Prettier config (printWidth, tabWidth, semi, quotes, trailingComma), preview it on sample code, and export JSON, YAML, package.json or JS.

Generators

Plan a prompt A/B test: sample size per variant from a two-proportion z-test with Bonferroni correction, cost, duration and a Markdown plan.

AI tools

Compute prompt-caching breakeven and monthly savings from your static prefix, query tokens and call volume for every current model with cache pricing.

AI tools

Build AI prompt templates with variables, live preview, and export to JSON/YAML

AI tools

Split a model's context window across system prompt, tools, memory, retrieved documents and history, with a warning when allocation passes 80%.

AI tools

Diff two prompt versions line by line, with markers for template variables, XML tags and instruction keywords, plus added variables and token delta.

AI tools

Decode binary protobuf payloads with optional .proto schemas. Inspect field tags, wire types, and nested messages.

Developer utilities

Generate QR codes for URLs, text, WiFi, email, phone numbers and vCards with custom colors and error correction, as SVG or PNG.

Generators

Recommend a RAG chunk size, overlap and chunking strategy from document type, query type and embedding model, with a context-window token budget.

AI tools

Convert an API rate limit and window into requests per second, and check expected traffic for utilization, headroom and an over-limit warning.

Developer utilities

Generate a README.md scaffold with title, description, features, installation, usage and license sections from a project name and feature list.

Generators

Test JavaScript regular expressions with live match highlighting, capture groups, replace preview and plain-English pattern explanations.

Developer utilities

Test JavaScript regular expressions with live match highlighting, numbered and named groups, a token-by-token explanation and replace mode.

Developer utilities

Generate endpoint-level retry and idempotency contracts with deterministic test vectors and rollout guidance

Developer utilities

Generate robots.txt with per-bot Allow and Disallow rules, crawl-delay, sitemap URLs and AI crawler blocks like GPTBot, or validate an existing file.

Generators

Validate RSS/Atom XML and preview feed entries with parser diagnostics

Developer utilities

Check whether a version satisfies a ^, ~, >=, <= or exact semver range, or compare two x.y.z versions by major, minor and patch.

Developer utilities

Explain a shell command part by part, covering commands, flags, pipes and redirects, and warn about risky patterns like rm -rf or curl piped to sh.

Developer utilities

Generate a sitemap.xml from absolute URLs with optional lastmod, changefreq and priority, skipping invalid lines and warning past 50,000 URLs.

Generators

Plan which agent skills to keep, compress or defer when their combined token payload exceeds the context window minus reserved tokens.

AI tools

Build deterministic regression suites for skill updates with risk-weighted pass-rate gates and CI-ready case definitions

AI tools

Generate staged canary rollout plans for skill updates with deterministic stop conditions and rollback checklists

AI tools

Detect cross-scope skill version and enabled-state collisions across global, user, project, and local configuration layers

AI tools

Convert one canonical skill definition into OpenClaw SKILL.md, Claude blocks, Codex scaffolds, and MCP manifest snippets

AI tools

Convert a title into a URL-safe slug with accent transliteration, hyphen or underscore separators, stop-word removal and a maximum length.

Converters

Format and minify SQL queries with 2-space, 4-space or tab indentation and uppercase, lowercase or capitalized keywords.

Formatters

Parse a Server-Sent Events log into event and data frames and replay the streamed text at 0.25x to 4x, with a timing chart and event-type counts.

Developer utilities

Generate ~/.ssh/config Host blocks with ProxyJump, local, remote and dynamic port forwarding, identity files, presets and security warnings.

Developer utilities

Parse openssl x509 -text output for issuer, subject, SANs and validity dates, with warnings for expired certificates or ones expiring within 30 days.

Developer utilities

Edit SVG path d attributes on a canvas with draggable points, and reverse, mirror, scale, round or convert paths to absolute commands.

Generators

Convert an SVG into a React component with camelCased attributes, className, style objects, optional TypeScript props, prop spread and currentColor.

Converters

Drag databases, caches, queues and load balancers onto a canvas, connect them, start from six templates, and export the design as PNG, SVG or JSON.

Developer utilities

Estimate a system prompt's tokens for Claude, GPT, Llama and Gemini, its share of a 4K to 200K context window, and its template variables.

AI tools

Write and analyze AI system prompts with live token counting, variable detection, and XML highlighting

AI tools

Browse and copy curated system prompts for coding, writing, analysis, business, education and creative tasks, searchable by keyword.

AI tools

Build systemd .service, .timer and .socket unit files with ExecStart, User, Restart, Environment and hardening directives, validated before install.

Generators

Search and browse Tailwind CSS utility classes by category, see the CSS behind each one with a live preview, and copy class names.

Developer utilities

Convert CSS declarations to Tailwind utility classes, each labeled exact, approximate or arbitrary value, and copy them as a class string or JSX.

Converters

Build a Tailwind v4 @theme block of color, spacing, font, breakpoint and container tokens, with dark color values by media query or .dark class.

Generators

Format Terraform HCL with terraform fmt-style indentation and aligned equals, and lint for hardcoded secrets, 0.0.0.0/0 rules and undeclared vars.

Formatters

Generate up to 1,000 rows of fake test data from a custom schema of typed fields, as JSON, CSV or PostgreSQL and MySQL INSERTs.

Generators

Compare two texts or code snippets line by line in side-by-side or unified view and copy the unified diff. The API also diffs JSON and YAML.

Developer utilities

Convert identifiers and text between camelCase, PascalCase, snake_case, kebab-case, Title Case and other formats, with case detection.

Converters

Show a prompt's token boundaries as a heatmap and flag zero-width, non-breaking and bidirectional control characters that change how a model reads it.

AI tools

Validate TOML and convert it to JSON or YAML and back, for Cargo.toml, pyproject.toml and other config files.

Converters

Compile cross-platform allow, ask, and deny decisions for tool capabilities across Codex, Claude, and managed MCP policies

AI tools

Validate W3C traceparent and tracestate headers for distributed tracing correctness and propagation safety

Developer utilities

Classify failed trace events into root-cause buckets and output deterministic remediation guidance for agent incident triage

AI tools

Build a tsconfig.json from five presets with target, module, strict flags, path aliases and project references, with an explanation of each option.

Generators

Break text into characters and show each one's code point, UTF-8 bytes, UTF-16 units, HTML entity, JS escape and a broad category.

Converters

Convert Unix timestamps in seconds or milliseconds to ISO 8601, UTC, local and IANA timezone dates, or turn a date back into a timestamp.

Converters

Percent-encode or decode text and URLs with encodeURIComponent or encodeURI, and see a table of every character that changed.

Converters

Extract OG tags, canonical URLs, meta descriptions, and JSON-LD from pasted HTML

Developer utilities

Generate random UUID v4 or time-ordered UUID v7 values, up to 100 at a time, in standard, no-dash or uppercase format.

Generators

Infer a JSON Schema (Draft-07 or 2020-12) from a sample JSON document, with options for required fields, titles, examples and additionalProperties.

Developer utilities

Preview fade, slide, scale, morph and flip View Transitions on a live element and copy the HTML, CSS and JS with the cross-document @view-transition.

Developer utilities

Build a typed vite.config.ts for React, Vue, Svelte, Preact or Solid with plugins, aliases, a dev server proxy, build options and SSR or library mode.

Generators

Convert pasted HTML or a fetched URL to Markdown for LLM input, dropping scripts, navigation and footers, and estimate the token savings.

AI tools

Analyze webhook payloads with formatted JSON view, HMAC signature verification, timestamp detection, and cURL reconstruction

Developer utilities

Verify a webhook's HMAC-SHA256 or HMAC-SHA1 signature against your signing secret, and inspect its headers, JSON body and timestamps.

Developer utilities

Validate WebMCP tool definitions or a webmcp.json manifest against lint rules, test them with a form built from the schema and preview discovery.

AI tools

Detect website frameworks and platforms from pasted HTML, headers, and script URLs

Developer utilities

Connect to ws:// or wss:// endpoints with the native browser WebSocket API. Send and receive frames in JSON, text, or hex.

Developer utilities

Count words, characters with and without spaces, sentences, paragraphs and lines, with reading and speaking time and the 10 most frequent words.

Developer utilities

Build a Cloudflare Workers config as wrangler.toml and wrangler.jsonc with KV, D1, R2, Durable Objects, Queues, Hyperdrive, routes, vars and crons.

Generators

Format, beautify, and validate XML with syntax highlighting, tree view toggle, and minification

Formatters

Convert XML to JSON and JSON to XML, with a configurable attribute prefix, #text keys for element text and arrays for repeated tags.

Converters

Convert YAML to JSON and JSON to YAML as you type, with 2 or 4-space indentation, key sorting and line-numbered parse errors.

Converters

Validate YAML, JSON5 and JSON config files with line-numbered syntax errors, lint warnings such as tab indentation, and conversion between formats.

Developer utilities