A collection of free, fast, privacy-first developer tools. No login, no tracking, no bloat. Just clean tools that do one thing well.
Browse 500+ AI prompts for coding, writing, analysis, and more.
Search 400K+ public AI/ML datasets from Hugging Face, Kaggle, and more.
Count tokens in text for GPT-4, Claude, Llama, and other models.
Build, test, and refine system prompts for LLM-based applications.
Generate standardized model cards for ML models with documentation.
Format, validate, minify, and prettify JSON data instantly.
Decode and inspect JWT tokens — header, payload, signature, expiration.
Encode text or files to Base64 and decode back. UTF-8 safe.
Test regular expressions in real-time with match highlighting and groups.
Generate UUIDs and ULIDs — v4, v7, bulk mode, copy, download.
Convert Unix timestamps to human-readable dates and back.
Generate MD5, SHA-1, SHA-256, SHA-512 hashes for text and files.
Format and beautify SQL queries for PostgreSQL, MySQL, SQLite.
Build and test cron expressions with visual schedule previews.
Generate .gitignore files with 500+ templates for any tech stack.
Convert JSON arrays to CSV spreadsheets and back. Supports nested data.
Convert between JSON and YAML formats with comments preserved.
Convert Markdown to clean HTML with live preview and GFM support.
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats.
Calculate API costs for GPT-4, Claude, Gemini, and other LLMs.
Calculate rate limits, burst capacity, and throttling for APIs.
Estimate database size based on row count, columns, and data types.
Calculate bandwidth and data transfer costs across cloud providers.
Generate realistic fake data in JSON, CSV, or SQL format.
Convert JSON to TypeScript interfaces, types, and Zod schemas.
Generate CREATE TABLE statements from JSON or CSV data.
Generate OpenAPI 3.1 specifications from sample data.
Generate realistic mock API responses for frontend development.
Everything runs in your browser. We never store your data.
Server-rendered, optimized, minimal JavaScript. Tools load instantly.
Every tool is free. No plans, no trials, no upsells.