Chat & messaging services
whatsapp.com
Messaging service for mobile and web with encrypted conversations, group chat and calls, owned by Meta.
Matrix
matrix.org
Open standard and network for decentralised messaging that several chat clients build on.
Rocket.Chat
rocket.chat
Open source chat platform for organisations with self-hosting and built-in customer service chat.
Zulip
zulip.com
Open source group chat where conversations are organised into topic threads rather than running channels.
Session
getsession.org
Encrypted messaging service without phone number or email, sending via a decentralised network.
SimpleX Chat
simplex.chat
Encrypted messaging app without user accounts or user IDs, built with a focus on anonymity.
Briar
briarproject.org
Encrypted messaging app for Android that can also send directly between phones without internet.
Delta Chat
delta.chat
Chat app that sends messages as ordinary email and so requires no new account.
Jami
jami.net
Free messaging and calling service without central servers, developed under the GNU Project.
Wire
wire.com
Encrypted messaging and meeting platform aimed at businesses and public authorities.
Viber
viber.com
Messaging app with free calls, chat and groups between users.
Threema
threema.ch
Swiss messaging app with encryption and use without a phone number.
Telegram
telegram.org
Messaging app with chats, channels and large groups across devices.
Slack
slack.com
Chat platform for workplaces with channels, threads and integrations.
Signal
signal.org
Encrypted messaging service run by a non-profit organisation.
Microsoft Teams
microsoft.com
Microsoft's platform for chat, meetings and collaboration in businesses.
Mattermost
mattermost.com
Open source chat platform for teams that can be self-hosted.
Element
element.io
Open messaging client built on the Matrix protocol with encrypted chat.
Discord
discord.com
Chat and voice platform with servers for communities and groups.
Chatten.dk
chatten.dk
Danish chat site where users write together in open and private rooms.