The SimpleX project began with the announcement of the prototype SimpleX Messaging Server (SMP) and its underlying protocol.

SimpleX Chat was officially released for mobile with apps on the Apple App Store and Google Play Store.

The results of a security assessment conducted by the firm Trail of Bits were published, enhancing the project's credibility.

A beta release of quantum-resistant end-to-end encryption was announced, using a hybrid post-quantum key exchange to protect against future threats.

The project announced an investment from Jack Dorsey and the firm Asymmetric, which enabled private message routing to be set by default.