Compare software

Microsoft OutlookSpark Mail
Freemium

Free app and account available; Microsoft 365 plans add paid features and Office apps.

 Freemium

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

Windows, macOS, Android, iOS, Web Windows, macOS, Android, iOS
  • Email, calendar and contacts for multiple accounts in one app
  • Available on desktop, mobile and web
  • Automatic inbox categorization cuts down on manual sorting
  • AI-drafted replies can speed up routine email responses
  • Closed source and tied to Microsoft services
  • Some features, including Copilot, require a paid plan
  • AI and team features are gated behind a paid plan
  • Some categorization requires manual correction over time
Downloadable app, Web application Downloadable app
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 22, 2026

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