DevKit

"100 free browser dev tools. No signup. Your data never leaves the browser.

by Remington Collier

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Mar 19, 2026 Developer Tools

api_testing browser_based code_validation

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Tired of pasting JWTs, API keys, and wallet addresses into random online tools?DevKit is a collection of 100 free developer tools that run entirely in your browser. No signup. No server. Your data never leaves your device.What's inside:Format & Validate: JSON, SQL, YAML, HTML, CSS, OpenAPIEncode/Decode: Base64, URL, JWT, Unicode InspectorConvert: cURL→fetch, JSON→TypeScript, CSS Units, Timestamps, chmod, CronGenerate: UUID, Hash, Password, .gitignore, Robots.txt, Sitemap XML, Color ShadesTest: Regex, Diff, JSONPath, Security Headers Analyzer, CIDR CalculatorAI/ML: Token counter, Dataset cleaner, Confusion matrix, Embedding visualizerWeb3: Keccak-256, ABI encoder, Merkle tree, Gas calculator, Wallet validatorDocs/Cheatsheets: Git (70+ cmds + rescue scenarios), Docker, Bash, TypeScript, React Hooks, Tailwind, SQL, VS Code5 developer themes: Midnight, GitHub Dark, Dracula, Nord, Monokai. Live search across all 100 tools. Zero popups. Zero dark patterns.→ https://devkit.escalixstudio.com