| Price from | $20/mo | A$14.95/mo |
| Free plan | — | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| macOS | Yes | — |
| iOS | Yes | — |
| Android | Yes | Yes |
| Plans published | 3 | 2 |
| Spec score · AI Email Assistants | 8.3 (#10) | 7.9 (#25) |
| Headquarters | Zürich, Switzerland | Australia |
| Platforms | Kai offers a browser app and a macOS desktop app, and its homepage lists availability on iPhone and Android. | Quell offers a web app, a Chrome extension that works inside Gmail and Outlook, and an Android app. |
| Security | Morgen says it uses access controls, authentication, transport encryption, monitoring, rate limiting, logging, least-privilege access, and vendor security reviews. | The security page states that traffic uses TLS 1.3 and minimal stored metadata is encrypted at rest with AES-256. |
| Support | Morgen lists Intercom as a provider for customer support and user communication, and the site provides a contact page. | The support page directs users to email for the fastest way to reach a human and links to setup and how-to help. |
