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Mailvelope vs Free-GPGMail: catalog facts
Mailvelope	Free-GPGMail
Free Free and open source for personal use. Business products are paid.	Free Free and open source under the GPL-3.0 license.
Browser extension	macOS
Works inside existing webmail rather than requiring a desktop mail client Keys stay in the browser under your control	OpenPGP encryption and signing inside Apple Mail No support plan purchase needed
Only supports a defined list of webmail sites Browser-based key storage is weaker than a dedicated client or smartcard	macOS and Apple Mail only Unofficial build that may lag behind GPGTools releases
Browser extension	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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