Simplifies web development and debugging by allowing quick header modifications.
Helps simulate various user environments and edge cases.
Reduces debugging time and potential production bugs.
Supports testing of feature flags without code changes.
Offers additional tools for header testing and security policy editing.

Cons

Primarily a browser extension, may not cover all advanced network debugging needs.
Specific pricing details are not immediately available on the provided pages.

What is ModHeader?

ModHeader is a popular browser extension designed to help web developers and QA engineers modify HTTP request and response headers. It allows users to easily add, modify, or remove headers such as authorization, set-cookie, and custom headers, directly within their browser. This functionality is crucial for tasks like simulating different user environments, testing API endpoints, debugging web applications, and verifying security policies. The extension streamlines the development workflow by enabling quick changes to header values without needing to alter server-side code or proxy configurations. It's particularly useful for testing various scenarios like different IP addresses, locales, CORS issues, and feature flags. By providing granular control over HTTP headers, ModHeader helps in faster debugging, reducing the time spent on identifying and fixing header-related issues, and ultimately minimizing production bugs. Beyond header modification, ModHeader also offers related tools like a header tester to inspect current request/response headers, and editors for Content-Security-Policy (CSP) and Permissions-Policy headers. These additional tools further empower developers to ensure web application security and functionality.

Available on: Chrome

Data compiled by Toolradar Pricing checked Sep 29, 2026 · How we evaluate

Source modheader.com

Key Features

Modify HTTP request headers
Modify HTTP response headers
Modify authorization headers
Modify set-cookie headers
Toggle feature flags via headers or cookies
Filter header modifications by tab
Test current browser request and server response headers
Parse, edit, and generate Content-Security-Policy (CSP) headers

Pricing Plans

Pricing checked Sep 29, 2026. Source: modheader.com/pricing, read Sep 29, 2026

ModHeader plans and prices, checked September 2026
Plan	Price	Details
Free	Free	Up to 10 rules & 3 profiles Share profiles publicly or with a few individuals Ad-free experience
ModHeader Pro	$4.00 / month	Unlimited rules & profiles Organization support Includes ModResponse Pro +1 more Show less Ad-free experience
ModHeader Pro (Annual billing)	$2.00 / month	Unlimited rules & profiles Organization support Includes ModResponse Pro +1 more Show less Ad-free experience
ModHeader Pro (One time payment)	$60	Unlimited rules & profiles Organization support Includes ModResponse Pro +2 more Show less Ad-free experience Pay only once!

Calculate your cost View full pricing

Is ModHeader worth the price?

Great value

ModHeader offers a very fair and generous pricing structure, especially for individual developers.

The Free tier is quite functional for basic needs, and the annual ModHeader Pro at $2.00/month is exceptionally affordable for unlimited features. This pricing is best for individual developers and small teams looking for a cost-effective header modification tool.

Hidden Costs & Gotchas

Monthly billing is double annual ($4 vs $2).

One-time payment is $60, equivalent to 2.5 years of annual.

No explicit mention of team seat pricing beyond 'organization support'.

Full ModHeader pricing: every plan, hidden costs and alternatives

How ModHeader's pricing compares

At $2/mo, billed monthly, ModHeader is the most affordable of its 6 comparable direct competitors.

ModHeader

$10

$12

$25

Entry paid plan, monthly price, billed monthly. Pricing checked Sep 29, 2026.

ModHeader by the numbers

Toolradar data: ModHeader's entry paid plan ($2/mo, billed monthly) ranks #1 of 8 for price among the Browser DevTools tools with a verified entry price and no stated unit, where the median is $4.99/mo. As of Oct 2026.

ModHeader compared with 33 Browser DevTools tools on Toolradar, as of Oct 2026
Metric	ModHeader	Peer median	Position (1 is best)
Entry paid plan	$2/mo, billed monthly	$4.99/mo	#1 of 8 tools with no stated price unit, verified price
Free plan	Yes	33 of 33 have one	n/a
Listed as an alternative to	3 tools	1	#9 of 33 (joint)

Each position is counted among the tools that have data for that row, as noted under it. A lower entry price ranks higher; prices are read on vendor pages and compared only with tools priced on the same basis. All Browser DevTools data · How we compute this. Advertising and placement fees are not inputs to any position.

Cite this: Toolradar, “ModHeader by the numbers”, Oct 2026.

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Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

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ModHeader FAQ

How does ModHeader assist with web application debugging?

ModHeader simplifies web application debugging by allowing developers to quickly add, modify, or remove HTTP headers directly from their browser. This enables testing of various scenarios like different IP addresses, locales, and CORS issues, which helps in faster identification and resolution of header-related problems.

What kind of user or team benefits most from ModHeader?

Web developers and QA engineers benefit most from ModHeader, as it provides crucial functionality for modifying HTTP request and response headers. It streamlines workflows for tasks such as simulating user environments, testing API endpoints, and verifying security policies.

How does ModHeader compare to Requestly for header modification?

ModHeader focuses on modifying HTTP request and response headers directly within the browser, simplifying web development and debugging. While Requestly also offers header modification, ModHeader provides specific tools like a header tester and editors for Content-Security-Policy and Permissions-Policy headers.

Can ModHeader help with testing feature flags?

Yes, ModHeader supports testing of feature flags without requiring code changes. By allowing quick modifications to HTTP headers, developers can simulate different user environments and test feature flag behaviors directly from their browser.

What are the limitations of ModHeader?

ModHeader is primarily a browser extension, which means it may not cover all advanced network debugging needs. Its functionality is focused on in-browser header modification rather than comprehensive network analysis.

How is ModHeader priced?

ModHeader is available on a free tier, offering basic functionalities for header modification. For users requiring more extensive usage and advanced features, paid plans are available.

Does ModHeader offer tools beyond basic header modification?

Yes, beyond modifying headers, ModHeader includes additional tools such as a header tester to inspect current request/response headers. It also provides editors for Content-Security-Policy (CSP) and Permissions-Policy headers, which are useful for web application security.

How does ModHeader pricing compare with other Browser DevTools tools?

ModHeader's entry paid plan ($2/mo, billed monthly) ranks #1 of 8 for price among the Browser DevTools tools with a verified entry price and no stated unit, where the median is $4.99/mo. Prices are read on each vendor's own pricing page and compared only with tools priced on the same basis. Source: Toolradar, Oct 2026.

Source: modheader.com

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