Delta Chat vs Silent Phone
Delta Chat
delta.chatSilent Phone
silentcircle.comSide by side
| Figure | Delta Chat | Silent Phone |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Encrypted Messaging Apps | 8.3 (#4) | 6.9 (#38) |
| Headquarters | Freiburg, Germany | Geneva, Switzerland |
| Integrations | Delta Chat supports chatmail relays and in-chat web apps, and can use a classic email address as a relay with limitations. | Silent Phone supports SSO through OpenID Connect and Active Directory Federation Services, SIEM systems, and deployment via MDM. |
| Messaging | The app supports multi-profile and multi-device use, and relays messages through secure, interoperable chatmail relays. | Users can send messages, voice memos, documents, videos, images, and other files, with burn timers from one minute to 90 days. |
| Platforms | The download page lists Android, iPhone/iPad, macOS, Windows, GNU/Linux, and a community-driven Ubuntu Touch effort. | Silent Circle provides Silent Phone for iOS and Android devices. |
| Product | Delta Chat is a reliable, decentralized and secure instant messaging app for mobile and desktop. | Silent Phone provides end-to-end encrypted voice and video calls, messaging, and file transfers for teams. |
| Support | The site links to a Delta Chat forum for support and feedback. | The maker says customers receive a dedicated client liaison and direct access to technical support staff. |
Plans
In their own words
Delta Chat
Delta Chat is a free, open-source instant messaging app for mobile and desktop, with support for self-hosting. It runs on Android, iOS, Linux, macOS and Windows, and supports multiple profiles and devices. Messages travel through secure, interoperable chatmail relays and are end-to-end encrypted by default, including attachments and their metadata. Delta Chat uses a subset of OpenPGP with Secure-Join and Autocrypt. Servers can still see sender and receiver addresses and message size; other message, contact and group metadata is encrypted. Chats can include interactive web apps for gaming and collaboration. Android and iOS audio and video calls use peer-to-peer WebRTC, but a March 2026 post said the feature was still behind a debug setting. A classic email address can act as a relay only if used exclusively by chatmail clients, and classic email providers generally do not support push notifications. The FAQ says there are no immediate plans for a web client. The project links to a forum for support and feedback.
Silent Phone
Silent Phone has no write-up on Specifiction yet; its figures are above.