K-9 Mail
6.6#89 in email clientsFree planFree planAndroid
VisitK-9 Mail vs Mailbutler Smart Assistant
Mailbutler Smart Assistant
8.9#2 in email clientsFree planFree planAndroidiOSWebExtension
VisitWhat both publish
| Fact | K-9 Mail | Mailbutler Smart Assistant |
|---|---|---|
| Documentation | The user manual page says the manual has been abandoned because the team lacks resources to keep it up to date; a historic version remains available. | The support center lists 16 getting-started, 10 tracking, 6 tailored-sending, 11 collaboration, 3 signature, 7 subscription, 5 troubleshooting and 2 FAQ articles. |
| Free plan | Yes | Yes |
K-9 Mail plans
- K-9 MailFree
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
Pick K-9 Mail if…
You want what its maker publishes above — check its page for the details.
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.