Mailbutler Smart Assistant
8.9#2 in email clientsFree planFree planAndroidiOSWebExtension
VisitMailbutler Smart Assistant vs Metis Mail
Metis Mail
8.3#9 in email clientsFrom $115 a yearFree planWebAPISelf-hosted
VisitWhat both publish
| Fact | Mailbutler Smart Assistant | Metis Mail |
|---|---|---|
| Company founded | Mailbutler was founded in 2015 and its product launched in March 2016. | LinkedIn lists AstraQ Cyber Defence as founded in 2025. |
| Company legal name | The company is Mailbutler GmbH, registered in Berlin under HRB 166863 B. | The operating company is ASTRAQ CYBER DEFENCE PRIVATE LIMITED, CIN U62090PN2025PTC244094. |
| Free plan | Yes | Yes |
| Headquarters | Berlin, Germany | Akola, Maharashtra, India |
| Licence | The terms license proprietary software, prohibit sublicensing, reverse engineering and derivative works, and allow use on up to two computers by one user. | The founder describes the code as Business Source License 1.1, with each published version converting to MIT four years after release. |
| Paid from | 4 | 12 |
| Product | Mailbutler presents Smart Assistant as an AI email assistant for Apple Mail, Gmail, and Outlook. | Metis Mail is an open-source email client with an AI agent for Gmail, Microsoft Outlook/Microsoft 365, and Zoho Mail. |
| Rating on G2 | 4.5 out of 5 from 65 reviews. | No Metis Mail product rating is shown on G2's October 14, 2026 email-management category page; that page reports 213 products and highlights other vendors. |
Mailbutler Smart Assistant plans
- 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
Metis Mail plans
- Open sourceFree
- Cloud Pro$12 a month
- Workspace$20 a month
- Cloud Pro annual$115 a year
- Cloud Pro (annual)$115 a year
- Workspace (annual)$192 a year
Pick Mailbutler Smart Assistant if…
It suits people who want AI drafting, reply, summary, and task-finding tools in Apple Mail, Outlook, or Gmail. Check the supported operating systems and subscription requirement before choosing it.
Pick Metis Mail if…
You want what its maker publishes above — check its page for the details.