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Free-GPGMail vs Mailvelope: catalog facts
Free-GPGMail	Mailvelope
Free Free and open source under the GPL-3.0 license.	Free Free and open source for personal use. Business products are paid.
macOS	Browser extension
OpenPGP encryption and signing inside Apple Mail No support plan purchase needed	Works inside existing webmail rather than requiring a desktop mail client Keys stay in the browser under your control
macOS and Apple Mail only Unofficial build that may lag behind GPGTools releases	Only supports a defined list of webmail sites Browser-based key storage is weaker than a dedicated client or smartcard
Downloadable app	Browser extension
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
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 2, 2026	Official website Full listing and sources Checked September 22, 2026

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