What RequestFox is
A side panel in Chrome, a sidebar in Firefox. While you use the web app you are testing, it records every API call the app makes and flags the ones that failed, dragged, fired twice or broke inside a 200 OK, in plain words with what to do next.
The same panel is also an API client, a way to mock or break a call without touching the backend, a set of checks you can run in CI with its downloadable command-line tool, and a tester for the AI tools you build. Everything it does
Who makes it
RequestFox is made and published by AccessiSight, the RequestFox team. The comparison pages on this site are written by the same team; every fact they state about another tool comes from that tool's own documentation, linked and dated on each page. Every comparison, with sources
Why it is free
RequestFox is free, and our promise is written here: nothing you can use for free today will be put behind a paywall later. It has no ads, no account and no paid tier.
Where your data lives
Everything RequestFox captures stays in your browser's storage on your device. There is no RequestFox server, no analytics and no account. Authorization headers, cookies and secret-shaped fields are redacted by default in everything RequestFox keeps, logs or exports. Requests you send yourself go to the servers you chose, and nowhere else.
How it is built
- No AI inside: RequestFox runs no AI model and gives nothing you capture, type or send to any AI service.
- The extension ships no third-party code and takes no plugins.
- Works in Google Chrome and Mozilla Firefox, in 14 interface languages.
- It is free. Its code is MIT-licensed and ships readable inside the extension; the source repository is not public.
Questions and bugs
For a question about privacy or about how the extension behaves, write to the address in section 8 of the privacy policy. To say what works and what does not, leave a review on the Chrome Web Store or Firefox Add-ons listing.