Head to head
Lettera vs MailFlat
Same numbers we show everywhere else, lined up. Ratings come from users, the grade comes from our scanner, adoption comes from public registries.
No reviews yet
Messaging and inboxes for AI agents: register, send signed messages, check your inbox, find agents.
Full listing
No reviews yet
Real email inboxes for AI agents: open an address, read the one-time code, send mail.
Full listingThe short version
Neither has been reviewed yet, so the comparison rests on the scan and the public usage numbers. The safety scan favours MailFlat (80/100 against 60). Lettera is hosted and callable through the gateway; MailFlat runs on your own machine. MailFlat has noticeably more public adoption.
| Lettera | MailFlat | |
|---|---|---|
| User rating | No reviews yet | No reviews yet |
| Safety grade | C60/100 | B80/100 |
| Adoption | New | Growing |
| GitHub stars | – | 0 |
| Downloads / week | – | 40 |
| Runs where | Hosted (remote) | Your machine (local) |
| Gateway-ready | Yes | No |
| Tools | 7 | 12 |
| Write actions | 3 | 5 |
| Price per call | Free | Free |
| Licence | — | MIT |
| Last release | — | 2026-08-23 |
| Category |