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Superhuman Mail vs Spike: catalog facts
Superhuman Mail	Spike
Paid Paid subscription; see the site for current plans.	Freemium Free for individuals; paid plans add AI and team features.
Web	Windows, macOS, Android, iOS
Keyboard-driven workflow for fast inbox processing Works with existing Gmail and Outlook accounts	Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster
Only supports Gmail and Outlook accounts Paid product, bundled into a wider suite	Chat-style format is a matter of preference and not for everyone Advanced AI and team features require a paid plan
Web application, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account 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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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