Compare software

Claws Mail vs Alpine: catalog facts
Claws Mail	Alpine
Free Free and open source under the GPL 3.0 or later.	Free Free to download and use.
Windows, macOS, Linux	Windows, Linux, Command line
Opens and searches enormous mail folders without stalling Plugins for PGP, spam filtering, RSS and calendars ship with it	Lightweight keyboard-driven terminal interface Complete documentation built into the program
Composes plain text by default; HTML mail sending is deliberately limited The interface is functional and looks like it was designed in 2004	Text-only interface with no rich HTML rendering Releases are infrequent
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: Apache-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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