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Header Editor vs Requestly: catalog facts
Header Editor	Requestly
Free Free and open source.	Freemium Free to download, with flat per-user pricing for team and enterprise features.
Browser extension	Windows, macOS, Linux, Browser extension, Command line
Edits request and response headers Can modify response bodies	Collections stored as local JSON files that work with Git One-click import from Postman
Rule writing assumes some knowledge of HTTP	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
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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