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Spark Mail vs Nine: catalog facts
Spark Mail	Nine
Freemium Free for individuals; paid plans add AI features and team tools.	Paid Pricing is not listed on the homepage; check the store listing for current terms.
Windows, macOS, Android, iOS	Android, iOS
Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses	Direct Push sync with Exchange ActiveSync servers Mail, calendar, contacts, tasks and notes in one app
AI and team features are gated behind a paid plan Some categorization requires manual correction over time	IMAP accounts sync email only Pricing not stated on the homepage
Downloadable app	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
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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