Any alternative to requestly?

Discussion & Solutions
1

I thought I had found an useful tool.

Unfortunately, it became restricted, even if claimed as “open source” :

https://app.requestly.io/pricing

Any similar tool with no restrictions ?

2

:1st_place_medal: Best No-Restriction Alternative to Requestly

Relay (Chrome Extension)

Relay is an open-source browser extension that lets you intercept and modify HTTP requests directly inside your browser. It doesn’t require an account or paid plan.

Why it’s the best unrestricted alternative

  • :white_check_mark: No login required
  • :white_check_mark: Open source
  • :white_check_mark: No rule limits
  • :white_check_mark: Works directly in the browser
  • :white_check_mark: Free

You install it and start intercepting requests immediately.

:wrench: Main Features

:one: Intercept HTTP requests

Relay can capture requests made by websites and APIs.

You can see:

  • headers
  • request body
  • parameters
  • response data

This helps debug frontend apps and APIs.

:two: Modify requests

You can edit requests before they are sent.

Examples:

  • Change Authorization headers
  • Modify POST body
  • Add or remove headers
  • Change query parameters

This is useful for testing APIs or bypassing certain checks during development.

:three: Run API requests directly in the browser

Relay can send requests manually like a mini Postman inside Chrome.

You can:

  • run REST requests
  • test endpoints
  • export requests as cURL commands.

:four: Save and organize sessions

Relay lets you save request sessions so you can reuse them later for debugging or testing.

:brain: When Relay is best

Relay is ideal if you want something:

  • similar to Requestly
  • 100% free
  • no account
  • no SaaS limits
  • browser-only tool

:high_voltage: Other good “no restriction” alternatives

mitmproxy

  • advanced interception tool
  • CLI-based
  • extremely powerful
  • used in security research

HTTP Toolkit

  • intercepts traffic from apps, browsers, and mobile
  • supports mocking APIs

Tweak

  • modify HTTP requests easily
  • good for frontend testing

There are 25+ tools similar to Requestly including Postman, mitmproxy, and Fiddler depending on your use case.

:white_check_mark: My recommendation

If you want something closest to Requestly but with no restrictions:

:backhand_index_pointing_right: Relay

If you want something much more powerful:

:backhand_index_pointing_right: mitmproxy

3

Requestly has indeed shifted to a more restricted model over time. While the core remains open-source on GitHub (requestly/requestly) and you can still use many features for free or self-host parts of it, the cloud-synced features, unlimited rules/mocks, team collaboration, and some advanced modifications now push toward paid plans (as seen on their pricing page). This is a common evolution for freemium dev tools.

Here are some solid similar tools that focus on being unrestricted, fully open-source, or truly free forever with no artificial limits on core interception/modification features:

Strong open-source alternatives (browser extensions or desktop apps)

  • Inssman A fully open-source Chrome/Firefox extension specifically for modifying HTTP requests and responses. Features: Custom rules to modify headers, change responses, block requests, redirects, custom HTML/CSS/JS/JSON injection, logging. No paid tiers or restrictions mentioned — completely free and open-source. GitHub: https://github.com/vvmgev/Inssman Chrome Web Store: Search for “Inssman: Open-Source: Modify HTTP Request”.

  • HTTP Toolkit Excellent open-source desktop app (with browser integration via extensions) for intercepting, viewing, debugging, and mocking HTTP(S) traffic. It works system-wide or per-browser, supports request/response modification, rules, breakpoints, and injecting custom responses/scripts. Fully free for most use cases, open-source core, no hard limits on rules or modifications (some advanced team/cloud features are paid, but local usage is unrestricted). Highly regarded as a modern Charles/Fiddler alternative. Website: https://httptoolkit.com

  • Tamper Dev (formerly Tampermonkey-like for requests, but focused on interception) Chrome extension that lets you intercept, inspect, and edit live HTTP requests/responses. Very powerful for on-the-fly modifications. Free, no mentioned restrictions.

Other good open-source options (more API client + some interception)

If you’re okay with a tool that’s stronger on API testing but still offers interception/modification:

  • Hoppscotch (formerly Postwoman) — Fully open-source, lightweight API client with request interception in browser contexts.

  • Bruno — Open-source, Git-friendly API client (local files, no cloud required).

  • Insomnia (core is open-source) — Great for API work, with some proxy/interception capabilities.

Quick comparison table for interception focus

Tool Type Fully Open-Source No Usage Limits Modification Types Desktop or Browser
Inssman Browser extension Yes Yes Headers, response, block, redirect, inject Browser
HTTP Toolkit Desktop + browser Core yes Yes (local) Full proxy: mock, rewrite, breakpoints Desktop/Browser
Request Interceptor Browser extension Partial? Yes Redirect/block, headers, query params Browser
Easy Interceptor Browser extension Yes Yes Overwrite response for XHR/fetch Browser

Many users who got frustrated with Requestly’s limits have switched to Inssman or HTTP Toolkit for pure interception work without nagging upgrades.

If you tell more about your main use case (e.g., header mods only, API mocking, script injection, mobile debugging), I can narrow it down further!

4

Thanks. Well, this one looks a good alternative for me : https://httptoolkit.com/

5

Sounds like the freemium speedrun got you.

Found a thing → it worked → "10 rules limit" wall dropped → you came here. The universal pain underneath: “free becomes freemium becomes pay-up the second I started relying on it.”

Three things to know, in order.

:bullseye: Your browser already does most of this

Chrome shipped Override Content in 2018. Override Headers in March 2023.

Right-click a request in DevTools → Override headers or Override content → edit → persists across reloads.

▸ No extension.
▸ No signup.
▸ No rule cap.

→ Native Chrome docs

:warning: If Override headers isn’t in your right-click menu, that’s just an older Chrome. Update to 111+ (chrome://version to check) and it appears.

What DevTools won’t do: modify request headers or request body. For those, escalate ↓

:magic_wand: The escalation table

If you need… Use this
:green_circle: Modify response body / headers only DevTools Overrides (above)
:green_circle: Drop-in extension, MIT, no rule cap, no signup Inssman
:yellow_circle: Intercept everything — Docker, Android, Node, terminal, browser HTTP Toolkit
:yellow_circle: Modify request headers (the DevTools gap) Inssman or HTTP Toolkit

I keep DevTools Overrides set up for the 80% case — mocking JSON while a backend dev finishes their endpoint — and HTTP Toolkit pinned for the 20% where I need request headers or to intercept a Node process. Took me a year to realise I’d been installing browser extensions for something Chrome shipped in 2018. Filing this so you don’t lose that year.

:mouse_trap: Three cheat codes Google won’t show you

🎭 #1 — Keep using Requestly itself, paywall-free

There’s a self-host workflow posted inside Requestly’s own GitHub discussions, acknowledged by the maintainer in the same thread:

→ https://github.com/orgs/requestly/discussions/594

Recipe:

  1. Clone the Requestly repo
  2. Run the local build:
    sh install.sh local && sh build.sh local
  3. Edit your hosts file:
    127.0.0.1 app.requestly.io
  4. Point a local webserver at the build output

Same UX you liked. No cloud round-trip. No rule cap.

:light_bulb: Works because the extension just talks to whatever’s at app.requestly.io — and now that’s your laptop. The maintainer can’t paywall a hosts-file entry.

🧨 #2 — Power-user tier (when extensions run out)

:globe_with_meridians: Whistle — 15.3k :star:, MIT, Node-based proxy.

→ Desktop client shipped v1.5.3 on Jan 1, 2026 — skips the npm setup pain.
→ English README at README-en_US.md if the UI feels too 中文.

:shield: Burp Suite Community — free with PortSwigger account.

→ Under Proxy → Match and replace, covers literally everything Requestly did.
→ Plus Repeater, Decoder, full proxy history.
→ Starter rule library.

:scroll: 30-line userscript in Tampermonkey or Violentmonkey.

→ Code you wrote yourself can’t be paywalled.
→ Working fetch-interception template — copy → paste → modify → yours forever.

:light_bulb: Most permanent solution that exists. No vendor to outlive, no pricing page to read.

🪦 #3 — The graveyard (don't fall for these)

:warning: ModHeader — the #1 “free alternative” on every 2024 listicle. ALSO went freemium — 10-rule cap on free tier. Same disease. Skip it.

:warning: Resource Override — stopped MV3 migration. Chrome shows removal warning. Dead.

:warning: Charles Proxy — paid ($50). 30-min trial loop. Marketed as “free trial.” Don’t waste the click.

:warning: Fiddler Everywhere — Telerik freemium with account wall. Same disease as Requestly.

:warning: Postman / Insomnia — recommended in every listicle, but they’re API clients, not interceptors. Different category.

You said you thought you’d found a useful tool. Turns out it was sitting in your browser the whole time.