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ElectronMail vs Proton Mail Bridge: catalog facts
ElectronMail	Proton Mail Bridge
Free The open-source software is available without a license fee. Hosting, hardware and…	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux	Windows, macOS, Linux
Adds desktop-oriented features around Proton Mail.	It runs a local IMAP and SMTP server that handles the encryption, so Thunderbird, Outlook or Apple Mail…
Requires a Proton account and depends on an external mail service.	It needs a paid Proton plan, and it has to keep running in the background for mail to…
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is 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 22, 2026	Official website Full listing and sources Checked September 22, 2026

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