SimpleX Chat
8.0#1 in encrypted messaging appsFree planFree planAndroidiOSAPILinux
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| Fact | SimpleX Chat | Siskin IM |
|---|---|---|
| Encryption | The network uses end-to-end encryption with continuous post-quantum key exchange for messages and metadata. | OMEMO end-to-end encryption is available in Tigase’s client apps. |
| Headquarters | London, United Kingdom | San Francisco, California, United States |
| Open source | Alternative client applications based on SimpleX Chat code must publish modifications under the AGPLv3 license. | Tigase says its XMPP chat applications are open source, with code available in public GitHub repositories. |
It suits people seeking messaging without network-assigned profile identifiers, with encrypted messaging, calls, and optional self-hosted servers. Developers can use its protocol SDKs for bots and integrations.
You want what its maker publishes above — check its page for the details.