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Spark organizes your inbox. Swizero gives it an ending.

Two mobile-friendly email apps with different end goals.

Two philosophies, one problem

Spark

Organization as the solution

Smart inbox, AI gist summaries, team assignments, cross-platform sync. Spark categorizes, prioritizes, and surfaces the right emails so you can work through them more intelligently. The inbox is still infinite — just better sorted.

Swizero

Completion as the solution

Finite sessions, AI ranking, a fixed card limit. Swizero surfaces 12 cards, you swipe to act, and when the stack is done, email is done. There is no endless scroll. There is a finish line.

Core philosophy

SwizeroMake email finite
SparkSmart inbox organization

Interface

SwizeroCard-based swipe UI
SparkTraditional inbox with smart features

Session model

Swizero12-card bounded runs
SparkUnlimited inbox

AI features

SwizeroSummaries, drafts, ranking
SparkSmart inbox, gist summaries, compose

Team features

SwizeroIndividual only
SparkTeams, shared inboxes, assignments

Privacy

SwizeroZero-retention, local ranking
SparkCloud-based

Platform

SwizeroiOS (Gmail)
SparkiOS, Mac, Android, Windows

Pricing

Swizero$9.99/mo
SparkFree + $7.99/mo Premium

Best for

SwizeroMobile-first finite sessions
SparkCross-platform smart inbox

When to choose Swizero

  • You want email to have a clear ending each session
  • You're one person, not a team
  • You want mobile-first one-handed triage
  • Privacy-first: zero-retention AI

When to choose Spark

  • You need team email (shared inboxes, assignments)
  • You want full cross-platform support today
  • You prefer a traditional inbox view with smart sorting
  • Budget is a concern (Spark has a generous free tier)

Ready to try the finite inbox?

Join the beta waitlist and experience email that actually ends.

See how Swizero protects your email data →View pricing