SimpleX Chat

SimpleX Chat

About this app

SimpleX - the first messaging platform that has no user identifiers of any kind - 100% private by design!

Security assessment by Trail of Bits: https://simplex.chat/blog/20221108-simplex-chat-v4.2-security-audit-new-website.html

SimpleX Chat features:
- end-to-end encrypted messages, with editing, replies and deletion.
- disappearing messages with opt-out per contact/group.
- NEW message reactions.
- NEW delivery receipts, with opt-out per contact.
- multiple chat profiles, with hidden profiles.
- app access and self-destruct passcodes.
- incognito mode - unique to SimpleX Chat.
- sending end-to-end encrypted images and files.
- voice messages up to 5 minutes – also end-to-end encrypted.
- "live" messages – they update for all recipients as you type them, every few seconds - unique to SimpleX Chat.
- single-use and long-term user addresses.
- secret chat groups - only group members know it exists and who is the member.
- end-to-end encrypted audio and video calls.
- connection security code verification, for contacts and group members – to protect from man-in-the-middle attacks (e.g. invitation link substitution).
- private instant notifications.
- encrypted portable chat database - you can transfer your chat contacts and history to another device.
- animated images and "stickers" (e.g., from GIF and PNG files and from 3rd party keyboards).

SimpleX Chat advantages:
- 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.
- 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.
- 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.
- decentralized proxied peer-to-peer network: you can use SimpleX Chat via your own relay servers and still communicate with people using pre-configured or any other SimpleX relay servers.
- fully open-source code.

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 - relay servers do not have access to this information.

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

Please send us any questions via the app (connect to the team via the app settings!), email [e-mail] or submit issues on GitHub (https://github.com/simplex-chat/simplex-chat/issues)

Read more about SimpleX Chat at https://simplex.chat

Get source code in our GitHub repo: https://github.com/simplex-chat/simplex-chat

Follow us on Reddit (r/SimpleXChat/), Twitter (@SimpleXChat) and Mastodon (https://mastodon.social/@simplex) for the latest updates.

Ratings and reviews

best chat for simplicity. pros: no data collected, simple interface, can add friends without a phone number, transfer large files easily. free voice chat. good voice quality. cons: notifications can be slow. sometimes 10 minutes. kind of hard to set up at first. you can only send one file at a time even though you can select multiple ones. only the last selected will send. however the challenge setting up is due to the security and privacy. once you have added friends it's very simple to use.

The only issue that I have been running into is, that sometimes messages don't arrive at their destination (1 tickmark visible). Android recipient changing settings to "always listen" (from checking every 10 minutes), then back to "check periodically" (every 10 minutes) has been fixing this. Recipient has "always running in the background" enabled, no power management on this app. Otherwise, we are very satisfied with SimpleX Chat (we have been using the latest versions all this time).

great app just have moreThe app is great overall, but it still needs some improvements. Connection stability could be better, especially during peak hours. Uploading files sometimes fails or takes too long. It would also be very helpful if new members could see the full chat history when joining a group. With these improvements, the app would be much more reliable and user-friendly. 💗

What’s new

New in v6.4.4:
- reduced battery usage with background service.

New in v6.4-6.4.3:
- new UX to connect.
- review new group members.
- chat with group admins.
- approve contact requests from group members.
- UI support for bot commands.
- markdown hyperlinks.
- option to remove tracking parameters from links.
- new UI languages: Catalan, Indonesian, Romanian and Vietnamese.

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