Free Developer Tools
Fast, free, no sign-up. A growing collection of everyday developer utilities — some powered by AI — that run entirely in your browser.
Regex Tester & AI Explainer AI
Test patterns live, then get a plain-English explanation from AI.
Cron Expression Explainer
Decode any cron schedule and preview the next run times.
JSON to TypeScript
Turn any JSON payload into clean TypeScript interfaces.
More tools are on the way. Have a request? Let me know.
A growing hub of free developer tools
Developers lose a surprising amount of time to small, repetitive tasks: decoding a cron schedule, sanity-checking a regular expression, or hand-writing TypeScript interfaces for an API response. This page collects fast, focused utilities that take those chores off your plate — each one does a single job well, runs instantly, and stays out of your way.
Some of the tools are enhanced with AI where it genuinely helps, such as explaining a gnarly regular expression in plain English. The rest are deterministic and run entirely in your browser, so they are private, reliable, and always available.
Fast and free
No sign-up, no paywall, no clutter. Every tool loads instantly and does one job well.
Private by default
The utilities run in your browser. Your text, JSON, and schedules stay on your device.
Built by an engineer
Made by a senior full-stack engineer who uses these exact tools every day — accuracy first.
What’s in the toolbox
- Regex Tester & AI Explainer — Test a regular expression against sample text with live match highlighting and capture groups, then get an AI-powered, plain-English breakdown of exactly what the pattern does.
- Cron Expression Explainer — Paste a cron expression to see a human-readable description, a field-by-field breakdown, and the next upcoming run times — all computed instantly in your browser.
- JSON to TypeScript — Paste a JSON object or API response and instantly generate strongly-typed TypeScript interfaces, with nested types, arrays, and optional fields handled automatically.