Cwtch vs imo

Cwtch is a free decentralized messaging app for Android, Linux, macOS, and Windows. Direct conversations use Tor v3 onion services to create anonymous peer-to-peer connections between profiles, and Cwtch says communication is end-to-end encrypted over those services. Both participants must be online for peer-to-peer chat. Group conversations and offline delivery use a third-party server designed to learn as little as possible about message contents or metadata. Group messaging is experimental: users must enable the Experiments and Group Experiment settings, and the project calls metadata-resistant group communication an active research area. Conversation history is not preserved between sessions by default, though it can be enabled for an individual conversation. The protocol is open, allowing bots, services, and interfaces to integrate with Cwtch; core library, Go bindings, and interface code are linked as open source. There is no global display-name registry, which the security handbook says increases impersonation risk. The project recommends version 1.17.2, released October 2, 2026, for security fixes. The plan costs nothing.

imo is a communication app for internet calls and messaging, available on Android, iOS, macOS, web, and Windows. It offers HD audio and video calls, including international calls, and group video calls for up to 20 participants with no fixed time limit. Chats support real-time messages, photos, videos, voice recordings, and group conversations; its Big Group feature supports up to 5,000 members. Stories hold photos, videos, and text updates for 24 hours. Listed privacy features include end-to-end encryption, Time Machine, and disappearing messages, while account controls include two-step verification and spam blocking. Encryption coverage is mixed. Instant message translation is available, and the privacy policy says Google Translate may provide it. That policy also says imo collects usage data, including communication partners, times, and message content. On iOS, imo integrates with Siri and can access iCloud Drive for file sharing. The app is free, though mobile carrier data charges may apply to internet calls.