WhatsApp, Slack, Telegram, Wickr, Signal, Session, Quicksy, Tellonym, Xabber, Tox, SiskinIM, ChatStep, Briar, Dasher Messenger, Zulip, Bitmessage, Plumm, Zoho Cliq, ARKNet, Burn Note, monocles chat, Carrot.io, Quill Messaging, ChatSecure, Conversations, Confide, chat.onion, Coverme, Google Allo, SureSpot, Element X, Cryptocat, AtomJump.com, Tinode, Workchat, Say Hi!, Anonymous Messenger, Async, Engage Spaces, WowApp, Cyanide, BitMail, LeggoChat, SimpleX Chat, KeeperChat, WWChat, Sicher, OpenWhatsapp, SumRando Messenger, Jongla, GoldBug, Hemlis, Photo4Tune, Quaternion, Numbertank, PingPal Messenger, MyENIGMA, Lemon Group Messenger, FireFloo Communicator, Secret Messenger, DatChat, CHARE, PrivyTalks, GAM Messenger, Secure Chat are some alternatives to Threema.