Requestly Alternatives: 7 Tools and What Each Is For
Requestly does a lot: an HTTP interceptor as a browser extension and a desktop app, a long list of rule types, an API client and team workspaces. That breadth is exactly why some developers look elsewhere. Some only need a mock in one tab and want a smaller tool. Others need more than a browser can see, or want their mocks in code.
This post lists seven alternatives, grouped by the job they do best. I build tweak, so it comes first; every section also says when another tool is the better pick.
Why look for a Requestly alternative?
Requestly is a good tool, and for a team that shares rules every day it may be the right one. The common reasons to look around are:
- You only need part of it. A mock, a header or a redirect in one tab does not need an API platform.
- You want fewer moving parts. A smaller extension has fewer screens and concepts between you and the rule.
- Its paid plans are priced per user and aimed at teams, which is more than a solo developer may want to pay.
- You need something it is not built for, such as mocks that run in your test suite.
The seven at a glance
| Tool | Type | Best for | Free option |
|---|---|---|---|
| tweak | Browser extension | Mocks, headers, redirects and blocks in the browser | Free plan, no account |
| Proxyman | Desktop proxy | Mobile and desktop app traffic, a modern UI | Free tier |
| Charles | Desktop proxy | A long-standing proxy with breakpoints and rewrites | 30-day trial |
| Mock Service Worker | JavaScript library | Mocks in your codebase and your tests | Free, open source |
| Mokku | Browser extension | Mocks from the DevTools network log | Free, open source |
| ModHeader | Browser extension | Headers only (no longer installable) | Not available |
| Resource Override | Browser extension | Redirects only (no longer maintained) | Free |
1. tweak: the closest browser alternative
tweak is a browser extension for Chrome, Edge and Firefox that mocks, modifies, redirects and delays HTTP requests without code. It covers the part of Requestly most people use day to day, in a smaller tool.
- Mock rules: a URL, a method, a status code, a body and a delay, for any
fetchor XHR request on the tab. - Modify rules call the real server and patch its answer (Tweak Basic).
- Header, redirect and block rules are applied by the browser itself, so they reach page navigations, scripts and images, and all three are free.
- Request capture turns a real request into a prefilled rule, and you can import a HAR file.
- Pause & Edit holds a request or its response so you can change it once, on the page (Tweak Max).
Free: up to 12 mock rules, plus header, redirect and block rules, with no account. Tweak Basic is $2 a month and Tweak Max $4 a month, each with a 7-day free trial (pricing).
Where Requestly is the better fit: shared team workspaces (tweak shares rules by exporting a file), traffic outside the browser, and Safari. Our tweak vs Requestly comparison goes scenario by scenario.
Best for: solo developers, QA and designers who want a mock or an error state in seconds, without an account.
2. Proxyman: when the traffic is not in the browser
Proxyman is a desktop HTTP debugging proxy for macOS, Windows and Linux, with first-class support for debugging iOS and Android apps. It sees every request your machine (or a connected device) makes, and its tools include breakpoints, Map Local and JavaScript scripting.
Free: a free tier to start; breakpoints, Map Local and scripting are in the paid licenses.
Limits: a proxy means routing traffic through it and trusting its certificate for HTTPS. For a quick mock in one browser tab, that is more setup than the job needs.
Best for: mobile developers, and anyone debugging traffic from apps other than the browser. See tweak vs Proxyman.
3. Charles: the long-standing proxy
Charles is a web debugging proxy for Windows, macOS and Linux that has been around for many years. Its Breakpoints pause a request or a response so you can edit it, Map Local serves a local file in place of a remote one, and Rewrite changes headers, urls, query parameters and bodies with rules.
Free: a 30-day trial, then a paid license per user.
Limits: like any proxy, it needs proxy and certificate setup before the first request, which is more than a quick mock in one tab calls for.
Best for: developers who already know it, and teams that want one proxy for every client on the machine.
4. Mock Service Worker: mocks in your code
Mock Service Worker (MSW) is an open source library that intercepts requests in the browser with a service worker and in Node.js for tests. You write request handlers in JavaScript and commit them next to your code.
Free: free and open source.
Limits: it needs the app's source and a code change, so it cannot help on a site you do not build, and it is usually not shipped to staging or production. It is a library for developers, not a panel for QA.
Best for: mocks that every developer gets on clone and that run in CI. Most teams pair it with an extension for manual checks; see Mock Service Worker vs a browser extension.
5. Mokku: mocks inside DevTools
Mokku adds a tab to Chrome DevTools, next to the Network panel. One click turns a logged call into a mock with a body, a status, a delay and headers, and mocks can be JavaScript functions for dynamic answers.
Free: free and open source (MIT).
Limits: DevTools has to be open, and it is listed for Chrome and Edge only.
Best for: developers who live in the Network tab. It is one of several on our list of the best Chrome extensions to mock API responses.
6. ModHeader: for headers only (and what to use now)
If the only Requestly rule you used was Modify Headers, ModHeader used to be the obvious lighter choice. That changed in July 2026, when Google and Microsoft removed it from the Chrome Web Store and Edge Add-ons after researchers found a dormant data collector in its store build (The Hacker News). It can no longer be installed from either store.
Best for: nothing new. For headers only, see ModHeader alternatives: tweak header rules are free, and so is Simple Modify Headers.
7. Resource Override: for redirects only (and what to use now)
If you used Requestly's Redirect rule to load a local build on a production site, Resource Override did that one job for years. Its author has stopped development, and it was built before the browsers' move to Manifest V3.
Best for: existing setups that still work for you. For a maintained replacement, tweak's redirect rule keeps the path and query when you type an origin, supports regex capture groups and is free; see Resource Override alternative.
How to choose
- Browser only, quick, no account: tweak.
- Mobile or desktop app traffic: Proxyman or Charles.
- Mocks in your repository and your tests: Mock Service Worker, with an extension for manual checks.
- DevTools-first and open source: Mokku.
- Shared workspaces for a whole team, or Safari: Requestly itself may still be your best fit.
Every tool we compare tweak with is on the alternatives page.
FAQ
What is the best alternative to Requestly?
For mocking and modifying requests inside the browser, tweak: no account, a free plan with mock, header, redirect and block rules, and paid plans from $2 a month. For traffic outside the browser (mobile apps, desktop apps), a desktop proxy such as Proxyman or Charles. For mocks that live in your codebase and run in tests, Mock Service Worker.
Is there a free alternative to Requestly?
Yes. tweak is free for up to 12 mock rules plus header, redirect and block rules, with no account. Mock Service Worker and Mokku are free and open source. Proxyman has a free tier, and Charles has a 30-day trial.
Can a browser extension replace Requestly's desktop app?
Only for browser traffic. An extension sees what the browser sends, so it cannot intercept a mobile app, a desktop app or a command line tool. For those, use a desktop proxy like Proxyman or Charles, or the Requestly desktop app itself.
Which Requestly alternative works without an account?
tweak works without an account on its free plan, and so do Mokku and Mock Service Worker.
Try it
Install tweak on Chrome, Edge or Firefox and create your first rule. The free plan gives you 12 mock rules, no account required.
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