chat.simplex.simplex SimpleX Chat A private & encrypted open-source messenger without any user IDs (not even random)! SimpleX Chat MIT AGPL-3.0-or-later

SimpleX - the first messaging platform that has no user identifiers, not even random numbers!

Security assessment was done by Trail of Bits in November 2022.

SimpleX Chat features:

  1. end-to-end encrypted messages, with editing, replies and deletion of messages.
  2. sending end-to-end encrypted images and files.
  3. single-use and long-term user addresses.
  4. secret chat groups - only group members know it exists and who is the member.
  5. end-to-end encrypted audio and video calls.
  6. private instant notifications.
  7. portable chat profile - you can transfer your chat contacts and history to another device (terminal or mobile).

SimpleX Chat advantages:

  1. Full privacy of your identity, profile, contacts and metadata: unlike any other existing messaging platform, SimpleX uses no phone numbers or any other identifiers assigned to the users - not even random numbers. This protects the privacy of who you are communicating with, hiding it from SimpleX platform servers and from any observers.
  2. Complete protection against spam and abuse: as you have no identifier on SimpleX platform, you cannot be contacted unless you share a one-time invitation link or an optional temporary user address.
  3. Full ownership, control and security of your data: SimpleX stores all user data on client devices, the messages are only held temporarily on SimpleX relay servers until they are received.
  4. Decentralized network: you can use SimpleX with your own servers and still communicate with people using the servers that are pre-configured in the apps or any other SimpleX servers.

You can connect to anybody you know via link or scan QR code (in the video call or in person) and start sending messages instantly - no emails, phone numbers or passwords needed.

Your profile and contacts are only stored in the app on your device - our servers do not have access to this information.

All messages are end-to-end encrypted using open-source double-ratchet protocol; the messages are routed via our servers using open-source SimpleX Messaging Protocol.

 https://simplex.chat/blog/20250729-simplex-chat-v6-4-1-welcome-contacts-protect-groups-app-security.html

New in v6.4.5:

  • fixes for chats with admins.
  • better information about network errors.

New in v6.4-6.4.4:

  • new UX to connect.
  • review new group members.
  • chat with group admins.
  • new UI languages: Catalan, Indonesian, Romanian and Vietnamese.
  • Linux app builds for aarch64 CPUs
  • UI support for bot commands.
  • support markdown hyperlinks, such as [click here](https://example.com).
  • option to remove tracking parameters from the links.
 https://simplex.chat/blog/20250729-simplex-chat-v6-4-1-welcome-contacts-protect-groups-app-security.html

New in v6.4.4:

  • reduced battery usage.
  • fixes.

New in v6.4-6.4.3.1:

  • new UX to connect.
  • review new group members.
  • chat with group admins.
  • new UI languages: Catalan, Indonesian, Romanian and Vietnamese.
  • Linux app builds for aarch64 CPUs
  • UI support for bot commands.
  • support markdown hyperlinks, such as [click here](https://example.com).
  • option to remove tracking parameters from the links.
 https://simplex.chat/blog/20250729-simplex-chat-v6-4-1-welcome-contacts-protect-groups-app-security.html

New in v6.4.3.1:

  • UI support for bot commands.
  • support markdown hyperlinks, such as [click here](https://example.com).
  • option to remove tracking parameters from the links.

New in v6.4-6.4.2:

  • new UX to connect.
  • review new group members.
  • chat with group admins.
  • new UI languages: Catalan, Indonesian, Romanian and Vietnamese.
  • Linux app builds for aarch64 CPUs
 https://simplex.chat/blog/20250729-simplex-chat-v6-4-1-welcome-contacts-protect-groups-app-security.html

New in v6.4.2:

  • manually accept member contact requests, with option to auto-accept.
  • ignore contact requests from blocked group members.
  • markdown (links etc.) in profile bio/group purpose.
  • Linux app builds for aarch64 CPUs
 https://simplex.chat/blog/20250729-simplex-chat-v6-4-1-welcome-contacts-protect-groups-app-security.html

New in v6.4.1:

  • welcome your contacts: set profile bio and welcome message.
  • enable disappearing messages by default for new contacts.
  • short SimpleX addresses and group links now include profile images and welcome messages.
 https://simplex.chat/blog/20250703-simplex-network-protocol-extension-for-securely-connecting-people.html

New in v6.4.0:

  • Connect faster: message instantly once you tap Connect.
  • Review group members: chat with new members before they join.
  • Chat with admins: send your private feedback to group owners.
  • New group role: Moderator - can remove messages and block members.
  • Improved message delivery - less traffic on mobile networks.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1-7:

  • fix changing the user profile of the invitation link.
  • forward compatibility with short link data.
  • fixes
  • fixes mentions with trailing punctuation (e.g., hello @name!).
  • recognizes domain names as links (e.g., simplex.chat).
  • forward compatibility with "knocking" (a feature for group admins to review and to chat with the new members prior to admitting them to groups, it will be released in 6.4)
  • support for connecting via short connection links.
  • fix related to backward/forward compatibility of the app in some rare cases.
  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1-6:

  • forward compatibility with short link data.
  • fixes
  • fixes mentions with trailing punctuation (e.g., hello @name!).
  • recognizes domain names as links (e.g., simplex.chat).
  • forward compatibility with "knocking" (a feature for group admins to review and to chat with the new members prior to admitting them to groups, it will be released in 6.4)
  • support for connecting via short connection links.
  • fix related to backward/forward compatibility of the app in some rare cases.
  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1-5:

  • fixes
  • fixes mentions with trailing punctuation (e.g., hello @name!).
  • recognizes domain names as links (e.g., simplex.chat).
  • forward compatibility with "knocking" (a feature for group admins to review and to chat with the new members prior to admitting them to groups, it will be released in 6.4)
  • support for connecting via short connection links.
  • fix related to backward/forward compatibility of the app in some rare cases.
  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1-4:

  • fixes mentions with trailing punctuation (e.g., hello @name!).
  • recognizes domain names as links (e.g., simplex.chat).
  • forward compatibility with "knocking" (a feature for group admins to review and to chat with the new members prior to admitting them to groups, it will be released in 6.4)
  • support for connecting via short connection links.
  • fix related to backward/forward compatibility of the app in some rare cases.
  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1-3:

  • support for connecting via short connection links.
  • fix related to backward/forward compatibility of the app in some rare cases.
  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1-2:

  • fix related to backward/forward compatibility of the app in some rare cases.
  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.1:

  • scrolling/navigation improvements.
  • faster onboarding (conditions and operators are combined to one screen).

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20250308-simplex-chat-v6-3-new-user-experience-safety-in-public-groups.html

New in v6.3.0:

  • Mention members and get notified when mentioned.
  • Send private reports to moderators.
  • Delete, block and change role for multiple members at once
  • Faster sending messages and faster deletion.
  • Organize chats into lists to keep track of what's important.
  • Jump to found and forwarded messages.
  • Private media file names.
  • Message expiration in chats.
 https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

New in v6.2.1-5:

  • change media filenames when forwarding.
  • fully delete wallpapers when deleting user or chat.
  • important fixes
  • offer to "fix" encryption when calling or making direct connection with member.
  • broken layout.
  • option to enable debug logs (disabled by default).
  • show who reacted in direct chats.

New in v6.2:

  • SimpleX Chat and Flux made an agreement to include servers operated by Flux into the app – to improve metadata privacy.
  • Business chats – your customers privacy.
  • Improved user experience in chats: open on the first unread, jump to quoted messages, see who reacted.
 https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

New in v6.2.1-4:

  • important fixes
  • offer to "fix" encryption when calling or making direct connection with member.
  • broken layout.
  • option to enable debug logs (disabled by default).
  • show who reacted in direct chats.

New in v6.2:

  • SimpleX Chat and Flux made an agreement to include servers operated by Flux into the app – to improve metadata privacy.
  • Business chats – your customers privacy.
  • Improved user experience in chats: open on the first unread, jump to quoted messages, see who reacted.
 https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

New in v6.2.1-3:

  • important fixes
  • offer to "fix" encryption when calling or making direct connection with member.
  • broken layout.
  • option to enable debug logs (disabled by default).
  • show who reacted in direct chats.

New in v6.2:

  • SimpleX Chat and Flux made an agreement to include servers operated by Flux into the app – to improve metadata privacy.
  • Business chats – your customers privacy.
  • Improved user experience in chats: open on the first unread, jump to quoted messages, see who reacted.
 https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

New in v6.2.1-2:

  • important fixes
  • offer to "fix" encryption when calling or making direct connection with member.
  • broken layout.
  • option to enable debug logs (disabled by default).
  • show who reacted in direct chats.

New in v6.2:

  • SimpleX Chat and Flux made an agreement to include servers operated by Flux into the app – to improve metadata privacy.
  • Business chats – your customers privacy.
  • Improved user experience in chats: open on the first unread, jump to quoted messages, see who reacted.
 https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

New in v6.2.1:

  • fixes
  • offer to "fix" encryption when calling or making direct connection with member.
  • broken layout.
  • option to enable debug logs (disabled by default).
  • show who reacted in direct chats.

New in v6.2:

  • SimpleX Chat and Flux made an agreement to include servers operated by Flux into the app – to improve metadata privacy.
  • Business chats – your customers privacy.
  • Improved user experience in chats: open on the first unread, jump to quoted messages, see who reacted.
 https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

New in v6.2:

  • SimpleX Chat and Flux made an agreement to include servers operated by Flux into the app – to improve metadata privacy.
  • Business chats – your customers privacy.
  • Improved user experience in chats: open on the first unread, jump to quoted messages, see who reacted.
 https://simplex.chat/blog/20241014-simplex-network-v6-1-security-review-better-calls-user-experience.html

New in v6.1 - v6.1.1:

  • Misc fixes

New in v6.1:

Better security:

  • SimpleX protocols reviewed by Trail of Bits.
  • security improvements (don't worry, there is nothing critical there).

Better calls:

  • you can switch audio and video during the call.
  • share the screen from desktop app.

Better user experience:

  • switch chat profile for 1-time invitations.
  • customizable message shape.
  • better message dates.
  • forward up to 20 messages at once.
  • delete or moderate up to 200 messages.
 https://simplex.chat/blog/20241014-simplex-network-v6-1-security-review-better-calls-user-experience.html

New in v6.1:

Better security:

  • SimpleX protocols reviewed by Trail of Bits.
  • security improvements (don't worry, there is nothing critical there).

Better calls:

  • you can switch audio and video during the call.
  • share the screen from desktop app.

Better user experience:

  • switch chat profile for 1-time invitations.
  • customizable message shape.
  • better message dates.
  • forward up to 20 messages at once.
  • delete or moderate up to 200 messages.
 https://simplex.chat/blog/20240814-simplex-chat-vision-funding-v6-private-routing-new-user-experience.html

New in v6.0.1-4:

  • reduce traffic and battery usage on unstable networks.
  • only offer the next versions for update, based on SerVer ordering.
  • UI fixes.
  • reduce app memory usage and start time.
  • faster sending of files to groups.
  • fix rare delivery bug.

New in v6.0:

New chat experience:

  • connect to your friends faster.
  • archive contacts to chat later.
  • delete up to 20 messages at once.
  • increase font size.

New media options:

  • play from the chat list.
  • blur for better privacy.

Private routing:

  • it protects your IP address and connections and is now enabled by default.

Connection and servers information:

  • to control your network status and usage.
 https://simplex.chat/blog/20240814-simplex-chat-vision-funding-v6-private-routing-new-user-experience.html

New in v6.0.1-3:

  • reduce app memory usage and start time.
  • faster sending files to groups.
  • fix rare delivery bug.

New in v6.0:

New chat experience:

  • connect to your friends faster.
  • archive contacts to chat later.
  • delete up to 20 messages at once.
  • increase font size.

New media options:

  • play from the chat list.
  • blur for better privacy.

Private routing:

  • it protects your IP address and connections and is now enabled by default.

Connection and servers information:

  • to control your network status and usage.
 https://github.com/simplex-chat/simplex-chat/releases/tag/v6.0.0

New chat experience:

  1. connect to your friends faster.
  2. archive contacts to chat later.
  3. delete up to 20 messages at once.
  4. increase font size.

New media options:

  1. play from the chat list.
  2. blur for better privacy.

Private routing:

  1. it protects your IP address and connections and is now enabled by default.

Connection and servers information:

  1. to control your network status and usage.
 https://github.com/simplex-chat/simplex-chat/releases/tag/v5.8.2

General:

  1. missed call notification.
  2. remove notifications of hidden/removed user profiles.
  3. support for faster connection with the new contacts (disabled in this version).
  4. general fixes.

General:

  1. fixes in sending/receiving files.
  2. better error reporting when connecting to desktop app.
  3. prevent forwarding to conversations where conversation preferences do not allow message.

Android and desktop apps:

  1. support transparent theme colors for chat message bubbles.
  2. do not reset changed network settings when switching SOCKS proxy on/off
  3. fix swipe to reply when animation is disabled.
  4. fix bug when duplicate group shown in the UI.
 https://simplex.chat/ https://github.com/simplex-chat/simplex-chat/issues https://opencollective.com/simplex-chat https://simplex.chat/docs/translations https://simplex.chat/faq https://github.com/simplex-chat/simplex-chat chat.simplex.simplex.desktop #a5f0ff #110e26 https://simplex.chat/blog/images/simplex-desktop-light.png