Compare software

Gridlink Mail vs InboxPager: catalog facts
Gridlink Mail	InboxPager
Free Free and open source under GPL-3.0.	Free Free and open source under GPL-3.0.
Android	Android
Supports JMAP and classic IMAP and SMTP Includes JMAP contacts and calendar support with CardDAV and CalDAV alternatives	Supports IMAP, POP and SMTP over SSL/TLS Handles attachments and unread-message tracking
Android only A fork of Sterna Mail with a separate release and support path	Requires an email server that supports SSL/TLS.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account 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 October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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