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ModHeader vs Requestly: catalog facts
ModHeader	Requestly
Free Free browser extension with no sign-up.	Freemium Free to download, with flat per-user pricing for team and enterprise features.
Browser extension	Windows, macOS, Linux, Browser extension, Command line
Edits both request and response headers, including cookies Filters rules by URL, tab or resource type	Collections stored as local JSON files that work with Git One-click import from Postman
Only affects traffic from the browser Closed source	Team governance features are aimed at paid business plans The product has shifted focus from browser interception toward being an API client
Browser extension	Downloadable app, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.