Cyph vs Delta Chat
Cyph
cyph.com
Delta Chat
delta.chatSide by side
| Figure | Cyph | Delta Chat |
|---|---|---|
| Price from | $7/mo | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 9 | 1 |
| Spec score · Encrypted Messaging Apps | 8.0 (#14) | 8.3 (#4) |
| Encryption | Cyph says it uses multiple quantum-resistant ciphers to protect data against future advances in quantum computing. | All messages are end-to-end encrypted by default, and attachments and their metadata are included in the encryption. |
| Messaging | Cyph offers secure, private instant messaging. | The app supports multi-profile and multi-device use, and relays messages through secure, interoperable chatmail relays. |
| Product | Cyph describes itself as a cryptographically secure messaging and social networking service focused on privacy and ease of use. | Delta Chat is a reliable, decentralized and secure instant messaging app for mobile and desktop. |
| Support | Cyph provides a Help & Support link from its site. | The site links to a Delta Chat forum for support and feedback. |
Plans
Cyph
- Cyph Telehealth — Large Team$7 a month
- Cyph Telehealth — Medium Team$9 a month
- Cyph Telehealth — Large Team (Annual)$10 a month
- Cyph Telehealth — Small Team$10 a month
- Cyph Telehealth — Large Team (Month-to-Month)$15 a month
- Cyph Telehealth — Medium Team (Annual)$16 a month
- Cyph Telehealth — Small Team (Annual)$18 a month
- Cyph Telehealth — Medium Team (Month-to-Month)$20 a month
- Cyph Telehealth — Small Team (Month-to-Month)$25 a month
In their own words
Cyph
Cyph is a privacy-focused messaging and social networking service for secure conversations, video meetings, and encrypted storage. It offers private instant messaging, encrypted group video calls, and scheduled meetings. Cyph Vault stores files, passwords, notes, cryptocurrency, and other data in encrypted cloud storage. The service is available on Android, iOS, Linux, macOS, web, and Windows, including a browser app that needs no download. Cyph says WebSign checks the integrity of its web application each time it opens, and that multiple quantum-resistant ciphers protect data against future quantum-computing advances. It also says it automatically helps prevent impersonation without requiring manual fingerprint verification. The site reports that a Cure53 security audit found no major issues in application security or cryptographic implementations. Cyph Telehealth adds live group sessions, unlimited patient sessions, one-click onboarding, and secure notes, forms, and history. It describes Telehealth as beyond HIPAA-compliant and says it includes a BAA. Cyph has a free plan; paid pricing starts at $3/mo (annual).
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.