Kerna vs ReplyCalm
| Kerna | ReplyCalm | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | €12/mo | — |
| Open source | No | No |
| Platforms | macOS, Web, Windows | Web |
| Free plan | Yes | Yes |
| Tone controls | Yes | Yes |
| Custom instructions | Yes | — |
| Email context input | thread | prompt |
| Browser extension | No | — |
| Mail client support | both | — |
| Supported languages | 45 languages | 6 languages |
Both are listed in Best AI Email Writing Tools. On Inferse, Kerna scores higher on our published basis.