Secret Messenger Beta Testing Try out the latest beta version of Secret Messenger App for iOS and iPadOS using Apple TestFlight. To join the Secret Messenger beta, open the link on your iPhone, iPad after you install TestFlight. https://testflight.apple.com/join/DetCpT1W About Secret Messenger Secret Messenger App is an Open-Source Jabber (XMPP) Client for Apple and Android devices focused on Privacy and Security with full OMEMO support.