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Geary vs Mailspring: catalog facts
Geary	Mailspring
Free The software is free under its open-source licence. Hosting, hardware and external…	Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…
Linux	Windows, macOS, Linux
Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…	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
It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.	Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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