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Otto Mail vs Sol
Compare Sol's selective Gmail access, commitments and prepared work with Otto's mail, calendar, tasks and reviewable assistant workflows.
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Which one fits you
Pick Otto if
You want everyday Gmail or Outlook mail, calendar and tasks in the same app as your assistant.
Stay with Sol if
You want Sol's selective-access approach to commitments and prepared work.
At a glance
Prices in USD, as of Sept 2026. — means not verified here, not that a feature is absent. Confirm current offers and billing intervals before subscribing.
| Compare | Otto Mail | Sol |
|---|---|---|
| Price (USD, checked September 2026) | Free; Plus $6.99/month or $55.99/year; Pro $19.99/month or $159.99/year | Public price not verified in September 2026 |
| Platforms | Web, iOS | Check Sol's current supported platforms |
| Gmail + Outlook | Both supported; one account on Free | Gmail commitments documented; other provider support not verified here |
| Approval model | Review AI actions; chosen senders may auto-reply under an explicit rule; check the recorded result afterward. | Selective access and review before external outcomes |
| Free tier | One connected Gmail or Outlook account with core mail, calendar and tasks, plus an AI allowance. | Public free-plan terms not verified |
| Calendar / tasks | Calendar plus Google Tasks or Microsoft To Do for the selected account | Work preparation and commitment tracking documented |
Price (USD, checked September 2026)
- Otto Mail
- Free; Plus $6.99/month or $55.99/year; Pro $19.99/month or $159.99/year
- Sol
- Public price not verified in September 2026
Platforms
- Otto Mail
- Web, iOS
- Sol
- Check Sol's current supported platforms
Gmail + Outlook
- Otto Mail
- Both supported; one account on Free
- Sol
- Gmail commitments documented; other provider support not verified here
Approval model
- Otto Mail
- Review AI actions; chosen senders may auto-reply under an explicit rule; check the recorded result afterward.
- Sol
- Selective access and review before external outcomes
Free tier
- Otto Mail
- One connected Gmail or Outlook account with core mail, calendar and tasks, plus an AI allowance.
- Sol
- Public free-plan terms not verified
Calendar / tasks
- Otto Mail
- Calendar plus Google Tasks or Microsoft To Do for the selected account
- Sol
- Work preparation and commitment tracking documented
Similar ambition, different starting point
Sol describes selective access, Gmail commitments, person and company context, work preparation and review before external outcomes. That is substantial overlap with Otto's accepted-work views, relationship briefs and prepared research or documents where those features are enabled. Neither product should be reduced to an inbox summary tool.
Otto starts with a usable mail, calendar and task workspace for connected Gmail and Outlook accounts. Its assistant uses the selected account and can bring approved work through app and eligible channels. Sol's public page did not establish a current price or every provider and platform combination in September 2026, so check those directly before deciding.
Choose Otto when the everyday app across both providers matters. Choose Sol if its selective-access workflow is the one you prefer; evaluate the actual permissions and review steps in each product.
Questions, answered
Does Sol track commitments?
Yes. Sol's public product page describes Gmail commitments and work preparation.
What does Sol cost?
We could not verify a public price in September 2026. Ask Sol or check its current site for terms.
Try your next step in Otto
Core mail, calendar and tasks are free. AI has an allowance.
Open Otto