chompSMS is not available for iPhone but there are plenty of alternatives with similar functionality. The best iPhone alternative is Signal, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to chompSMS and 19 are available for iPhone so hopefully you can find a suitable replacement. Other interesting iPhone alternatives to chompSMS are WhatsApp (Free), Zulip (Free Personal, Open Source), Tinode (Free, Open Source) and Sesame Chat (Free Personal).
Signal is a messaging app with an unexpected focus on privacy, combined with all the features expected from a modern IM app. Signal has received a lot of praise from all around the world for its security and privacy-respecting technologies.
WhatsApp is an iPhone and Android messaging app which allows you to exchange messages without having to pay for SMS. In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.
Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
If you’ve ever wanted to send more than just an emoji or gif while chatting to express exactly how you feel, Vidii, lets you do it with short video clips from movies, tv, and the internet. We let you say more than just typed words.
SafeSwiss The world’s most effective end to end encryption security solution including P2P Voice, encrypted email, encrypted storage, ephemeral text chat, docs share & group chat for mobile phone devices and PC's.