Skype
Freemium
Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.
WhatsApp Messenger
Free
WhatsApp Messenger is an instant messaging platform owned by Facebook.
Tox
Open Source
Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.
Signal
Open Source
Signal is the most scalable encryption tool.
Linphone
Open Source
Linphone is a free voice over IP (VoIP) service and SIP client.
Wire
Free
Wire is a cross-platform, encrypted instant messaging client created by Wire Swiss. It is available for iOS, Android, Linux, Windows, macOS and Web browser cl…
FaceTime
Freemium
FaceTime is a proprietary videotelephony product developed by Apple Inc. FaceTime Audio is an audio-only version.
KakaoTalk
Freemium
KakaoTalk (Korean: 카카오톡), or sometimes KaTalk, is a free mobile instant messaging application for smartphones with free text and free call features.
YakYak
Open Source
YakYak is a desktop chat client for Google Hangouts.
Telegram
Free
Telegram is a free cloud-based instant messaging platform.
Adium
Open Source
Adium is an Open source multi-protocol instant messaging client for Mac OS X, supports MSN, Jabber, Yahoo! and other networks.
Viber
Freemium
Viber Free Messenger and Phone Calls.
Jitsi
Open Source
Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.
LINE
Freemium
LINE is a new communication app which allows you to make free voice calls and send free messages whenever and wherever you are.
ICQ
Free
ICQ is an open source instant messaging software.
qutIM
Open Source
qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger.
Zulip
Open Source
Zulip is a chat and collaborative software.
Compare Imo with alternatives
Compare WhatsApp Messenger and Imo and decide which is most suitable for you.