Mailbutler Smart Assistant vs Serif
Mailbutler Smart Assistant
mailbutler.io
Serif
serif.aiSide by side
| Figure | Mailbutler Smart Assistant | Serif |
|---|---|---|
| Price from | $7/mo | $30/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | — |
| iOS | Yes | Yes |
| Android | Yes | — |
| Plans published | 10 | 6 |
| Spec score · AI Email Assistants | 9.2 (#3) | 8.7 (#6) |
| Product | Mailbutler presents Smart Assistant as an AI email assistant for Apple Mail, Gmail, and Outlook. | Serif places an AI employee in shared addresses such as info@, support@, and billing@ to answer routine email. |
| Public API | An independent directory reports that Mailbutler has no publicly documented API or MCP support and is operated through its user interface. | No public API, SDK or developer documentation is presented in Serif's site navigation or help center; official pages only describe customer Gmail and Microsoft connections. |
| Rating on G2 | 4.5 out of 5 from 65 reviews. | 5.0 out of 5 from 1 review |
| Rating on Trustpilot | 2.5 out of 5 from 248 reviews. | 3.8 out of 5 from 2 reviews |
| Security | Mailbutler says it is ISO/IEC 27001 certified and GDPR compliant, and that backend data is encrypted. | Serif states that it is SOC 2 Type 2, GDPR, and HIPAA compliant, and that emails are not used to train general AI models or stored on its servers. |
| What it does | Mailbutler adds AI writing, tracking, scheduling, collaboration and signature tools inside Apple Mail, Gmail and Outlook. | Serif describes itself as an AI workflow platform that automates email and document work for small businesses and operations teams. |
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
Serif
- Lite$30 a month
- Standard$50 a month
- Pro$200 a month
- Team$50 a month
- EnterprisePriced on request
- FreeFree
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.
Serif
Serif places an AI employee in shared email addresses such as info@, support@ and billing@ to handle routine messages. It connects to Google Workspace or Microsoft 365, or can work with an address of its own. The assistant can qualify and route inquiries, answer common questions, collect paperwork, send quotes and follow up on unpaid invoices. Ambiguous or sensitive messages are escalated to the team, and users can approve replies before allowing independent operation. The shared inbox page offers $100 in free credits without a credit card, and each plan includes a 7-day free trial with full access. Listed plans include Lite at $30 a month, Standard at $50 a month, Pro at $200 a month, and Team at $50 a month per user; each is billed monthly. Serif says it is SOC 2 Type 2, GDPR and HIPAA compliant, and that emails are neither used to train general AI models nor stored on its servers. Apps are listed for web, macOS, Windows and iOS; Android is coming soon.