Best Free Developer Tools (No Cost, Tested by Us)

Looking for free developer tools that actually work? We tested every option below — these are the best free developer tools that don't cost a thing, with honest pros and cons.

1Our pick #1

DevDocs

★ 4.7

Fast, offline-capable API documentation for 100+ programming languages.

✓ LocalNo sign-upFree

2Our pick #2

Crontab.guru

★ 4.6

The quick and simple cron schedule expression editor.

✓ LocalNo sign-upFree

3Our pick #3

Can I Use

★ 4.6

Browser support tables for modern web technologies — HTML, CSS, JS.

✓ LocalNo sign-upFree

4Our pick #4

JWT.io

★ 4.5

Decode, verify, and generate JSON Web Tokens online.

✓ LocalNo sign-upFree

5Our pick #5

JSON Formatter & Validator

★ 4.2

Format, validate, and beautify JSON with error highlighting.

No sign-upFreeServer-side