Side by side
Delta Chat vs imo
Both stand on encrypted messaging apps. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan AndroidiPhoneLinux+3
Delta Chat offers default end-to-end encryption and broad platform support at no charge. Note the visible server metadata and the stated limitations around browser access, classic email, and calls.
Visit Delta Chat Free plan AndroidiPhoneMac+2
imo combines messaging, internet calls and large-group features across several platforms at no charge. Its stated collection of message content and mixed encryption coverage are important privacy considerations.
Visit imoThe facts
| Delta Chat | imo | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Android, iPhone, Linux, Mac, Self-hosted, Windows | Android, iPhone, Mac, Web, Windows |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | delta.chat | imo.im |
| On encrypted messaging apps | #7 of 43 | #11 of 43 |
Delta Chat: what it does well
- Messages and attachments are encrypted by default.
- Available across mobile and desktop platforms.
- Chats support interactive web apps.
- Free plan; no trial required.
What to know first
- Servers can see addresses and message size.
- No immediate plans for a web client.
- Calls remained behind a debug setting in March 2026.
- Classic email relays have limited support and no typical push.
imo: what it does well
- Free HD internet audio and video calls
- Group video calls for up to 20 people
- Big Group supports up to 5,000 members
- Stories disappear after 24 hours
- Available on Android, iOS, macOS, web and Windows
What to know first
- Carrier data charges may apply to calls
- Privacy policy says message content is collected
- Encryption coverage is mixed
Alternatives to Delta Chat Alternatives to imo The whole list