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Mailspring vs Geary: catalog facts
Mailspring	Geary
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux	Linux
Unified inbox, snooze, send later, rules and templates in the free tier C++ sync engine keeps memory and battery use down for an Electron app	Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: LGPL-2.1
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 September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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