How do they compare, side by side?
| RequestFox | Requestly | |
|---|---|---|
| What it is | A browser extension that records and judges the calls a web app makes, and lets you replay, mock, check and export them | A browser extension that intercepts and changes browser traffic with rules [2]. It is also an API client, and a BrowserStack product [5] |
| Rules that change traffic | Mock and fault rules for an endpoint; header and URL rules that can stay on with nothing recording; in Chrome, a script that rewrites a request or reply | Rules that modify headers, bodies and query parameters, redirect, replace strings, delay, cancel, map to local or remote files, change the user agent, and insert scripts [1] |
| Watching traffic | Every call is recorded, tied to the click that caused it and kept in History; failed, slow, duplicate and retried calls, N+1 bursts and errors inside a 200 OK are flagged | A network traffic table, session recording and HAR import [1] |
| Browsers | Chrome and Firefox | Chrome, Firefox, Edge, Brave, Arc, Vivaldi and Opera; Safari with fewer features [1][2] |
| Beyond the browser | Browser tabs only | With its desktop app: mobile devices, simulators, desktop apps, Node.js and the terminal [1] |
| Team sharing | As files: collections, sessions, HAR, reports | Team Workspaces [1] |
| Price | Free, with no paid tier | Its HTTP Interceptor page says "Free to use" [3]; its pricing page lists plans for the API platform from $10 per user per month, billed annually, with a 30-day trial [4] |
| Source code | Free; MIT licence, repository not public | Its HTTP Interceptor page calls it open source [3] |
Where is Requestly stronger?
- A long list of rule types that stay on while you browse: change headers or bodies, redirect to another environment, map a URL to a local file, insert your own script or style into a page [1].
- More browsers: its extension lists Chrome, Firefox, Edge, Brave, Arc, Vivaldi and Opera [1].
- Traffic from outside the browser, through its desktop app: phones, simulators, desktop apps, Node.js and the terminal [1].
- Team Workspaces that sync rules between the extension and the desktop app [1].
- A wider product: a Git-native API client with collections, scripts and tests, sold in team plans [4][5].
Where is RequestFox different?
- It judges the calls. Failed, slow, duplicate and retried requests, N+1 bursts, GraphQL errors in a 200, expired tokens and changed shapes are flagged as they happen, each tied to the click that caused it.
- It keeps every session, so you can compare today's run with yesterday's, and turns a recording into checks you can run in CI.
- No account for anything, and nothing leaves your browser.
- Mock and fault rules label the calls they change, so nobody files a mocked answer as a bug.
Where RequestFox falls short, so you are not surprised:
- It runs in Chrome and Firefox. It sees what a browser tab sends; mobile and desktop apps need a proxy-based tool.
- It has no rule that puts script or style into a page.
- There is no team workspace or cloud sync, by design. Share work as files.
- It is free. Its code is MIT-licensed and ships readable inside the extension; the source repository is not public.
Can I use both?
Yes. They are separate extensions with separate jobs. Record and test a flow in RequestFox to see which calls fail and why; keep always-on rewrites, such as sending a request to a staging server, in Requestly. How to mock an API response in RequestFox. Also: RequestFox vs the DevTools Network panel and RequestFox vs Postman.
Sources
- Requestly Interceptor docs, "Desktop App vs Browser Extension". Checked . interceptor-docs.requestly.com
- Requestly Interceptor docs, "Browser Extension". Checked . interceptor-docs.requestly.com
- Requestly, "HTTP Interceptor". Checked . requestly.com
- Requestly, "Pricing". Checked . requestly.com
- Requestly, home page. Checked . requestly.com
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