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Otto vs Spark
Compare Otto Mail and Spark: free access, supported platforms, AI drafting and actions, and September 2026 prices.
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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 | Spark |
|---|---|---|
| Price (USD, as of Sept 2026) | Free; Plus $4.99/month or $39.99/year; Pro $14.99/month or $119.99/year | Free; Plus $10/month or $99/year; Pro $20/month or $199/year; Enterprise custom |
| Platforms | Web, iOS | Mac, Windows, iOS, Android; no web app |
| Gmail + Outlook | Both supported; one account on Free | Gmail, Outlook, Exchange / Microsoft 365, iCloud, Yahoo, IMAP |
| Approval model | Otto prepares AI sends, deletes and bulk changes for confirmation. Review the action card and check the result after approving. | AI Assistant can draft and send emails, archive and delete. Confirmation rules: — |
| Free tier | Free includes one connected account, core mail, calendar and tasks. AI has an allowance; paid tiers add capacity and features. | Smart Inbox, unlimited accounts and calendar |
| Calendar / tasks | Calendar plus Google Tasks or Microsoft To Do for the selected account | Calendar in every tier; reminders and mark as done, no task list |
Price (USD, as of Sept 2026)
- Otto Mail
- Free; Plus $4.99/month or $39.99/year; Pro $14.99/month or $119.99/year
- Spark
- Free; Plus $10/month or $99/year; Pro $20/month or $199/year; Enterprise custom
Platforms
- Otto Mail
- Web, iOS
- Spark
- Mac, Windows, iOS, Android; no web app
Gmail + Outlook
- Otto Mail
- Both supported; one account on Free
- Spark
- Gmail, Outlook, Exchange / Microsoft 365, iCloud, Yahoo, IMAP
Approval model
- Otto Mail
- Otto prepares AI sends, deletes and bulk changes for confirmation. Review the action card and check the result after approving.
- Spark
- AI Assistant can draft and send emails, archive and delete. Confirmation rules: —
Free tier
- Otto Mail
- Free includes one connected account, core mail, calendar and tasks. AI has an allowance; paid tiers add capacity and features.
- Spark
- Smart Inbox, unlimited accounts and calendar
Calendar / tasks
- Otto Mail
- Calendar plus Google Tasks or Microsoft To Do for the selected account
- Spark
- Calendar in every tier; reminders and mark as done, no task list
Assistance and action are different
Spark offers a free tier with Smart Inbox, unlimited accounts and calendar. Its AI Assistant can draft and send emails, archive and delete. Drafting text and making a change to your account are different responsibilities, so include both in your trial.
Otto lets you ask for help across email, calendar and tasks. Its AI sends, deletes and bulk changes use confirmation cards. Read the proposal before approving, then check the outcome; an approved or queued action is not yet a completed action.
Compare the controls you will use
Spark Plus is $10/month or $99/year; Pro is $20/month or $199/year. Spark runs on Mac, Windows, iOS and Android; Otto also offers a web app.
For Otto, begin with the assistant and calendar guides. Test the review steps on a real workflow, and choose a tier based on the accounts and AI capacity you need.
Questions, answered
Do both apps offer free access?
Yes. The September 2026 snapshot lists a Spark free tier. Otto Free includes one account, core mail, calendar and tasks, plus limited AI.
What can Spark's AI Assistant do?
Spark's help describes drafting and sending emails, archiving and deleting. Its confirmation rules are not documented.
What does approval mean in Otto?
Otto prepares AI sends, deletes and bulk changes for confirmation. Review the action card and check the result after approving.
Try your next step in Otto
Core mail, calendar and tasks are free. AI has an allowance.
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