Onoff is described as 'Get multiple phone numbers on your current phone, instantly. Onoff Numbers work with your regular SIM card & monthly contract - switch them ‘on’ or ‘off’ to control your availability and access them from any smartphone' and is a Social Network in the Social & Communications category. There are more than 25 alternatives to Onoff for a variety of platforms, including Android, iPhone, Online / Web-based, iPad and Windows. The best alternative is WhatsApp, which is free. Other great apps like Onoff are Hangouts (Free), Viber (Freemium), Facebook Messenger (Free) and aTalk (Free, Open Source).
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.
With Viber, everyone in the world can connect. Freely. More than 460 million Viber users text, make HD-quality phone and video calls, and send photo and video messages worldwide over WiFi or 3G - for free.
aTalk is an XMPP client that supports the following features: * Instant messaging in plain text and End-to-End encryption with OMEMO or OTR * OMEMO encryption is available during multi-user group chat session, giving users maximum privacy and security * Supports both voice...
Messenger Lite is a fast and data-efficient messaging app to reach the people in your life. Installs quickly. It's less than 10MB to install, saving storage space on your phone. Saves data. It loads fast, runs efficiently and uses less mobile data.
Daily is an audio and video API. Easily build video chats in your web or mobile apps with an API built on top of WebRTC or drop in the Prebuilt UI for fast video conferencing integration. 1,000 person video and audio calls. HIPAA compliant.
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).