Free Developer Tools

Generate a stack-aware AGENTS.md (or .cursorrules) file that Codex, Cursor, Claude Code, Aider, Amp and other agents will read before touching your code.

Paste a git diff or describe your change and get a clean, Conventional-Commits-formatted message with subject, body and footer — generated locally in your browser.

Generate a complete GitHub README.md from a short project description. Includes badges, features, install, usage, tech stack and license sections.

Paste any code in any language and get a clear walkthrough — summary, line-by-line logic, complexity, and improvements when relevant.

Rewrite a vague prompt into a structured one with role, goal, constraints, inputs, output format and edge cases — built for coding tasks.

Describe what you want to match in plain English. Get a working regex, JavaScript & Python snippets, and test cases that prove it works.

Ask a question in plain English (optionally with your CREATE TABLE schema) and get a SQL query plus an explanation and performance hints.

Paste a function and get a complete test file covering happy path, edge cases, error paths and async cancellation — in your test runner of choice.

Paste a git diff and get a complete pull request description: title, summary, test plan, and risk notes — ready to paste into GitHub.

Generate a Dockerfile with pinned base images, multi-stage builds, non-root users, healthchecks and a matching .dockerignore — for any stack.

Generate a complete .gitignore covering your stack(s), IDE(s) and OS(es) — sectioned with header comments, no duplicate patterns.

Generate a GitHub Actions workflow with pinned actions, least-privilege permissions, dependency caching and concurrency control.

Convert a range of git log entries into a Keep-a-Changelog formatted release note, grouped by Added / Changed / Fixed / Removed.

Describe a mood and get a 5–7 color palette with hex/RGB/HSL, ready-to-use CSS variables, and a Tailwind color block.

Describe a schedule in plain English and get a cron expression, English read-back, next 5 fire times, and ready-to-paste snippets.

Paste any JSON and get clean TypeScript interfaces, named from your keys, with proper optional handling.

Convert JSON into a Zod v3 schema with companion `z.infer` type — paste sample data, ship validation.

Convert JSON to Go structs with proper json tags, omitempty handling, and time.Time detection for ISO timestamps.

Convert JSON to Rust structs with serde derives, Option<T> for nullables, and Vec<T> for arrays.

Convert JSON to Pydantic v2 BaseModel classes, with Optional handling and datetime detection.

Paste CSS and get the equivalent Tailwind class string. Uses arbitrary values only when the theme has no exact match.

Paste either YAML or JSON. The tool auto-detects and gives you the other, preserving key order.

Paste JSON to format with 2/4/tab indent, sort keys, validate structure, and see size, depth and key count.

Test a regex pattern live with flag toggles (g/i/m/s/u/y), see all matches, indices and capture groups in one panel.

Paste a JWT and decode its header and payload, with friendly relative times for exp/iat/nbf claims. 100% client-side.

Encode and decode Base64 with full Unicode support. Toggle the URL-safe variant for tokens and identifiers.

Encode/decode strings with `encodeURIComponent` semantics, plus a parsed-URL panel that breaks down scheme, host, path and query.

Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests in hex and Base64. HMAC mode with secret key when needed.

Generate up to 1,000 IDs at a time. Choose UUID v4 (random), UUID v7 (time-ordered), NanoID, or ULID.

Generate placeholder text by paragraphs, sentences or words. Quick copy for mock-ups and design fills.

Generate strong passwords up to 128 chars with class toggles, an entropy meter, and an avoid-ambiguous-character mode.

Fill the form, get a complete <meta> block (Open Graph + Twitter cards) and see a live preview of how it renders on social platforms.

Render code into a styled card with macOS window chrome and download as PNG — no signup, no watermark, three themes.

Generate a downloadable QR code for a URL, plain text, WiFi network or vCard contact card.

Estimate token count and per-call cost across Claude Opus 4.7, Sonnet 4.6, Haiku 4.5, GPT-5, GPT-4o, Gemini 3 Pro and more.