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Regex101

Write and test regular expressions with clear explanations.

Check the platformFree listed · not rechecked
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Regex101

This is an older listing, not part of the latest source review. Check current access, pricing and restrictions on the official site.

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WebAIM Contrast Checker

Check whether your text colour is readable on its background

Free · checks colour pairs, not the whole site

Hoppscotch

See what an API actually returns before debugging the app

Free personal API workspace · team features paid

Penpot

Sketch a screen before asking someone to build it

Free design plan · cloud storage and history limits