Mailbutler Smart Assistant vs Spark +AI
Mailbutler Smart Assistant
mailbutler.io
Spark +AI
sparkmailapp.comSide by side
| Figure | Mailbutler Smart Assistant | Spark +AI |
|---|---|---|
| Price from | $7/mo | $10/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | — |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 10 | 4 |
| Spec score · AI Email Assistants | 9.2 (#3) | 8.6 (#7) |
| Founded | 2015 | 2007 |
| Integrations | Business plans sync tracking events with HubSpot and Salesforce and support Google Analytics 4 UTM data. | Official integration documentation lists Asana, Todoist, TickTick, Evernote, OneNote, Notion, Microsoft Teams, Zoom, HubSpot, Trello, Slack, and other services with platform-specific availability. |
| Rating on Apple App Store | 4.2 out of 5 from 282 ratings. | 4.6 out of 5 from 83K ratings |
| Rating on G2 | 4.5 out of 5 from 65 reviews. | 4.4 out of 5 from 60 reviews |
| Rating on Google Play | 3.3 out of 5 from 100 reviews. | 4.1 out of 5 from 89K reviews |
| Rating on Trustpilot | 2.5 out of 5 from 248 reviews. | 2.2 out of 5 from 36 reviews |
| What it does | Mailbutler adds AI writing, tracking, scheduling, collaboration and signature tools inside Apple Mail, Gmail and Outlook. | Spark is a cross-platform email client with unified inboxes, calendar tools, collaboration, and AI email assistance. |
Plans
Mailbutler Smart Assistant
- StarterFree
- Professional$9 a month
- Smart$14 a month
- Business$32 a month
- Professional (yearly billing)$7 a month
- Professional (monthly billing)$9 a month
- Smart (yearly billing)$11 a month
- Smart (monthly billing)$14 a month
- Business (yearly billing)$24 a month
- Business (monthly billing)$32 a month
In their own words
Mailbutler Smart Assistant
Mailbutler Smart Assistant adds AI writing and email-management tools to Apple Mail, Microsoft Outlook, and Gmail. It drafts messages from keywords or prepares replies using details a user supplies, with controls for format, length, style, tone, and language. It can summarize selected emails, identify to-dos for Mailbutler Tasks, and suggest spelling and grammar improvements to drafts. Mailbutler says the assistant uses OpenAI GPT-4o. Smart Assistant is included in a 14-day trial, then requires a Smart or Business subscription. The separate free Starter plan includes a visible Mailbutler watermark on sent emails. Mailbutler says email subjects and bodies are processed by Microsoft Azure OpenAI Service in the EU, with personal data redacted before submission to the underlying model. It also says backend data is encrypted and that it is ISO/IEC 27001 certified and GDPR compliant. Apple Mail support is listed for macOS Tahoe, Sequoia, Sonoma, and Ventura; mobile apps require iOS 15 or later or Android 7 or later.
Spark +AI
Spark +AI adds an AI assistant to Spark’s email app on Android, iOS, macOS, and Windows. It can search email, attachments, calendar items, and meeting notes, as well as draft or rephrase messages, proofread grammar and clarity, and translate. The assistant can check colleagues’ availability, schedule meetings, draft and send emails, and organize the inbox. It works with Gmail and Google Workspace, Outlook and Office 365 including Exchange Online, iCloud, Yahoo, and standard IMAP accounts; supported attachments are PDF and TXT. Spark lists integrations including Notion, Asana, Slack, Todoist, Zoom, Microsoft Teams, and HubSpot, with Salesforce and Pipedrive marked as coming soon. Spark says email and request history are processed locally, but a few query-related emails are sent to its AI provider; provider copies may be kept for up to 30 days for abuse monitoring. Spark says providers do not train models on user data, and AI can be disabled. Free includes five lifetime Meeting Notes; Plus costs $10 a month per user with 40 monthly notes, and Pro costs $20 a month per user with unlimited notes. AI features also use monthly quota.