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