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A better, free, and developer-friendly alternative to ModHeader
ModHeader is a fast, lightweight extension for modifying HTTP headers, but it stops at headers. Requestly does headers plus redirect, replace, mock, and script injection, with enterprise-grade security when your team needs it.
ModHeader is built for headers. Requestly goes further.
ModHeader is a fast, lightweight extension for modifying HTTP headers, and it stops there. As your testing gets more involved and your team grows, that single focus starts to show its limits.
Fast, lightweight header editing
- Fast, lightweight browser extension
- HTTP header modification
- URL redirects and modification
- Page-level filters
The gaps that show up as your team grows
- No API response modification
- No team collaboration or rule sharing
- No enterprise controls like SSO, RBAC, or auditing
Why choose Requestly over ModHeader
Requestly goes beyond header editing, with features built for both individual developers and growing teams.
Go beyond header editing
ModHeader stops at headers. Requestly intercepts, modifies, and mocks HTTP traffic in real time, in the browser and on the desktop, so you can redirect URLs, override API responses, inject scripts, and block requests from one place.
- Modify request and response headers
- Redirect and modify URLs
- Override API responses, inject scripts, and block requests
Simple and fast, on every platform
Requestly has a clean, easy-to-use interface designed by UX experts and a shallow learning curve, with detailed documentation and interactive guides that make you a power user from day one.
- Clean interface designed by UX experts
- Use it as a browser extension or a desktop app
- Works on Chrome, Firefox, Safari, Edge, Windows, Mac, and Linux
Collaborate and share rules in one click
Share Requestly rules across your team to promote consistency and accelerate development, something ModHeader does not offer.
- One-click rule sharing across your team
- Keeps rules consistent for everyone
- Speeds up development
Switch from ModHeader in one click
Import your ModHeader configurations into Requestly with a single click. One-click migration seamlessly brings over your ModHeader settings, making the transition quick and easy.
- One-click import of your ModHeader settings
- Seamless, quick transition
- Keep your existing configurations
Requestly vs ModHeader, feature by feature
| Feature | Requestly | ModHeader |
|---|---|---|
| HTTP header modification | Yes | Yes |
| Modify API response | Yes | No |
| URL redirects & modification | Yes | Yes |
| Page-level filters | Yes | Yes |
| Collaboration | Yes | No |
| Enterprise features (SSO, RBAC, auditing) | Yes | No |
| Support | Yes | No |
Simple, predictable pricing
Start free with unlimited header rules. Move up to Enterprise when your team needs full control and compliance.
For developers getting started with header and HTTP rule editing.
Download free- Unlimited header rules
- Standard HTTP modifications
- Forever-free header modification
- Free for students
For larger teams and organizations that need full control and compliance.
Contact sales- Unlimited usage & API access
- SSO & SAML
- GDPR & SOC 2 compliance
- User access management & SLAs
- Priority support via Slack, Email & Chat
Import your collection from anywhere in a single click
Already invested in another tool? Bring everything over (collections, environments and auth) without rewriting a thing.
Postman
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OpenAPI
A faster API client. Your data, your way.
Import your ModHeader workspace in one click and try Requestly in under two minutes.
Free · macOS, Windows & Linux
ModHeader Alternative FAQs
Requestly is a powerful HTTP interception and mocking tool that lets you intercept, record, and mock HTTP requests on the fly. While ModHeader is limited to modifying headers, Requestly goes much further, allowing you to redirect URLs, override API responses, inject scripts, block requests, and collaborate with your team using a modern UI.
Yes. Requestly is designed with enterprise-grade security in mind, including features like role-based access control (RBAC), single sign-on (SSO), and SOC 2 compliance. ModHeader is a basic browser extension with minimal security features and limited control over your data.
The HTTP interceptor and several SDKs are open source on GitHub (github.com/requestly/requestly). The API Client core is not open source.
Yes. Requestly offers a Free plan with essential features like unlimited header rules and standard HTTP modifications, perfect for getting started.
Yes. Requestly offers an Enterprise Plan built for larger teams and organizations that need full control and compliance. It includes unlimited usage, API access, SSO & SAML, GDPR and SOC 2 compliance, user access management, SLAs for support and uptime, invoice-based billing, and priority support via Slack Connect, Email, and Chat.
Yes! Requestly is free for students, enjoy access to powerful tools and features with no cost.
Response header modifications done by Requestly are not always visible in the browser's dev tools, but rest assured, they are being applied correctly. You can verify it by inspecting the network traffic through Requestly itself.
Yes, you can apply header modifications to specific HTTP methods by specifying the method condition within the rule settings. This ensures that headers are modified only for requests of certain types.
Yes, Requestly supports one-click migration to seamlessly import your ModHeader settings, making the transition quick and easy.