modheader
VibeHeader
Header Override
HeaderFlex.app
Live HTTP Headers
Modify Header Value (HTTP Headers)
Add custom HTTP request headers to any site. Set Authorization tokens, override Content-Type, inject debug headers per URL pattern. declarativeNetRequest. Free: 5 rules, Pro: unlimited.

Postman
Proxyman.io
ngrok
Hoppscotch
HTTP Toolkit
Fiddler
Warp
A Powerful API Mocking and Testing Tool

Which is more popular?
Based on our record, Requestly seems to be more popular. It has been mentioned 35 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Header Editor
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| Website | dev-tools-hub.xyz | requestly.com |
| Pricing | — | |
| Platforms | — | |
| Company | — | Startup from the United States · 20 - 49 employees · 2021 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Header Editor yet.
Requestly is a modern and powerful companion for API Development and Testing. It is an open-source tool purpose-built to speed up and simplify API development workflow for developers and QAs. It is a combination of API Client and HTTP Interceptor that helps create and share API Contracts, testing...
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

No analysis of Header Editor yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Header Editor and Requestly.
Requestly's answer:
Requestly's answer:
Front-end developers, QAs, PMs, Digital Marketers
Requestly's answer:
Requestly is an open-source API development and testing tool that combines the capabilities of an API Client and HTTP Interceptor, making it a better alternative to Postman + Charles Proxy. It simplifies API mocking, request modification, and debugging with an intuitive no-code interface, enabling developers and QAs to test APIs efficiently.
Share your experience with using Header Editor and Requestly. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

We have no reviews of Header Editor yet. Be the first one to post
On the pricing front, Requestly strikes a balance between affordability and functionality. It is an open-source tool, offering freemium to individual developers and affordable pricing plans for team collaboration. We...
Recommendations tracked on public social media and blogs since March 2021.

Tracking Header Editor since Aug 2026.
If you want to try a local-first workflow, you can start using Requestly here: https://requestly.com. - Source: dev.to / 10 months ago
That’s where automation changes the game. By pairing Cursor, an AI-powered coding assistant, with Requestly's local-first API testing and mocking platform, you can offload the grunt work of writing tests to AI while keeping execution... - Source: dev.to / 10 months ago
Requestly is a versatile browser extension and web client used to intercept, mock, and debug APIs in real-time—perfect for frontend developers. - Source: dev.to / over 1 year ago
When comparing Header Editor and Requestly, you can also consider the following products.
Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
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The Collaboration Platform for API Development
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An open-source ModHeader alternative trusted by 10,000+ developers. Edit and share headers with Profiles, URL filters, and a built-in tester.
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Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
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Open-source Chrome, Firefox, and Edge extension to modify HTTP request and response headers, cookies, and local profiles for API debugging.
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ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
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