Psi is not available for iPhone but there are plenty of alternatives with similar functionality. The best iPhone alternative is Jitsi, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Psi and 15 are available for iPhone so hopefully you can find a suitable replacement. Other interesting iPhone alternatives to Psi are Facebook Messenger (Free), XMPP (Free, Open Source), IM+ (Freemium) and iMessage (Free).
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
Tencent QQ, generally referred to as QQ, is the most popular free instant messaging computer program in Mainland China, and has over 856.2 million users. In April 2010, QQ.com ranked 10th overall in Alexas internet rankings.
Messenger Kids is a free video calling and messaging app designed for kids to connect with close friends and family from their tablet or smartphone. Kids can only connect with parent-approved contacts, which creates a more controlled environment.
Spotbros is an app where you can discover and share all types of content through public chat groups (Spots) or with your friends through private chats. Download our messaging app and get 1TB of free storage in the Spotbros cloud
Palringo is the lightweight Instant Messaging client for desktop computers. Express yourself in chat with emoticons and smileys to show your friends how you’re feeling. Send voice messages at the click of a button so your friends can hear your voice.