imo vs Threema
imo
imo.im
Threema
threema.comSide by side
| Figure | imo | Threema |
|---|---|---|
| Price from | Free | $3/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 1 | 4 |
| Spec score · Encrypted Messaging Apps | 8.2 (#10) | 7.9 (#18) |
| Spec score · Instant Messaging Software | 8.2 (#14) | 8.0 (#15) |
| Headquarters | Palo Alto, California, United States | Pfäffikon SZ, Switzerland |
| Integrations | The privacy policy describes iOS integration with Siri and access to iCloud Drive for sharing files. | Threema Gateway lets companies integrate Threema into existing software to send, receive and process messages. |
| Messaging | Chats support real-time messages, photo, video and voice-recording sharing, and group chat. | Threema supports text and voice messages, voice and video calls, group calls, media sharing, file transfers and desktop use. |
| Support | The download FAQ directs users who need help to [email protected]. | Threema provides support forms for the private app and management-cockpit support for Threema Work, plus dedicated Gateway and Broadcast support addresses. |
Plans
Threema
- Core$3 a month
- Professional$5 a month
- Private$6, paid once
- OnPremPriced on request
In their own words
imo
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.
Threema
Threema is a paid messaging service for private and business communication, supporting text and voice messages, voice and video calls, group calls, media sharing and file transfers. It can be used without a phone number or email address, and contact synchronization is optional. End-to-end encryption covers messages, media, calls, profile pictures, group names and group-member lists. The apps are open source, with repositories for Android, iOS, macOS, Windows, Linux and Threema Web. The regular desktop app and web client require a mobile device with Threema installed and activated. Threema operates its own servers in Zurich data centers of an ISO 27001-certified colocation partner. It says its apps receive regular audits by recognized security experts, including Cure53 audits in 2020 and 2024. Business tools include Gateway integrations, Work APIs and Broadcast features such as feeds, distribution lists, bots and managed group chats. Private use costs $6, paid once, with price varying by app store and country; Core starts at $3 a month billed annually. A 30-day trial is listed.