Sites and apps similar to Btwinus include Signal, which is free and open source. Other options are Telegram, SimpleX Chat, Briar and Wire. You can choose from more than 10 Encrypted Chat Apps like Btwinus for Android, Mac, Windows, Linux and iPhone.
Open source anonymous, registration free P2P chat. You communicate directly and no logs are saved on the server. Otr.to is browser based, which means that you don't need to install or ask somebody to install software.
Instantly establish temporary, secure chat rooms with SSL encryption and optional password control. No registration, personal data, or logs are required or stored. Each session provides a unique link, ideal for confidential conversations via a browser and sharing.
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