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Mailspring vs Spark Mail: catalog facts
Mailspring	Spark Mail
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Freemium Free for individuals; paid plans add AI features and team tools.
Windows, macOS, Linux	Windows, macOS, Android, iOS
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	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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.