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Spark MailMailspring
Freemium

Free for individuals; paid plans add AI features and team tools.

 Freemium

The client is free and open source. Mailspring Pro is a monthly subscription that adds…

Windows, macOS, Android, iOS Windows, macOS, Linux
  • Automatic inbox categorization cuts down on manual sorting
  • AI-drafted replies can speed up routine email responses
  • 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
  • AI and team features are gated behind a paid plan
  • Some categorization requires manual correction over time
  • Read receipts and link tracking are paid, and are tracking features
  • Electron, so still heavier than a native client
Downloadable app Downloadable app
Closed source Open source
License not stated License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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