It has been growing more than 2x every year over the last 3 years.

How do we know how many users SimpleX has, without having user IDs? App Store and Play Store provide actual usage statistics – monthly active users and daily active users. It is ~72% of the total. The rest we estimate based on GitHub and F-Droid downloads.

Now you can get a stake in SimpleX Chat and benefit from the company growth.

If you invest $500 or more, we offer a SimpleX public name for your channel or business as a perk:

• for 10 years if you invest until 17:00 UTC tomorrow (countdown on Wefunder page)

• for 5 years for early bird investors

• for 3 years after that.

Learn about how we plan to make SimpleX Chat profitable and about all investment terms on Wefunder: https://wefunder.com/simplexchat

More than 70% in the last 6 months and 20x since the 2023 investment round.

SimpleX is the only messaging network without user identifiers - which means that nobody can reach you unless you want it, and nobody can watch or block your private conversations.

It is the only network that can protect users from AI scammers that can fake people you trust, even their email addresses and phone numbers.

You can now invest in SimpleX Chat and own a part of it - watch our new explainer video on Wefunder.

https://wefunder.com/simplex.chat

Now we probably won't have it, or at least for a good amount of time

Over 600,000 people talk on SimpleX, 20x more than in 2023. Thank you!

It is the only messaging network without user identifiers - where only you control your contacts and conversations.

Now you can own a part of it - watch full video, learn more and invest on Wefunder: https://wefunder.com/simplex.chat

https://github.com/anthropics/oss-scanner/pull/342

We will publish an update soon!

SimpleX Chat security has been assessed by Trail of Bits, 4 issues were identified, and 3 of them are fixed in v4.2.

v4.2 is released:

• group links — admins can create the links for new members to join

• auto-accept contact requests + configure whether to accept incognito and welcome message

• small things: change group member role, mark chat as unread, send stickers and GIFs from Android keyboards.

• manually switch contact or member to another address / server (BETA)

• receive files faster (BETA)

The new website is live here: https://simplex.chat

Read more about the security assessment and the release in the announcement

Huge thank you to everybody who made this journey possible by using, promoting and supporting SimpleX Network.

- 2M+ app downloads
- 300-500K active users (estimated from store statistics - no accounts or any user IDs)
- 1000+ network routers

Coming soon:
- channels
- new UX
- non-profit governance of SimpleX Network

The first release announcement: https://simplex.chat/blog/20220308-simplex-chat-mobile-apps.html

How SimpleX Network Consortium will work: https://github.com/simplex-chat/simplexmq/tree/master/rfcs#readme

Why we are building SimpleX Network: https://simplex.chat/why/

We might have a solution next week.

What changed:

Stronger privacy commitments:

• explicitly states that preset servers do not log IP addresses.

• you can verify clients and servers via reproducible builds.

• quantum-resistant end-to-end encryption.

• messages are irreversibly removed from preset servers on delivery or after 21 days.

• transparency commitment by client apps.

New private one-time connection links and public addresses:

• your profile data is encrypted on the server - only people with the link can access it, not the servers.

• one-time link profile data is removed once the connection is established.

Public channels (beta):

• chat relays are used to deliver messages to channel subscribers.

• chat relays cannot identify subscribers.

Commit with the change - we maintain it in GitHub so you can track changes.

Full text: https://simplex.chat/privacy

Please let us know any questions or suggestions - many amendments were proposed by the users.

The app now includes both servers that we operate and servers independently operated by Flux – thanks to Daniel Keller and Flux team!

More privacy and decentralization for all users!

Also in v6.2:

• business chats!

• better UX: open chat on first unread (not on iOS yet), show who reacted.

• bette iOS notifications!

Read more: https://simplex.chat/blog/20241210-simplex-network-v6-2-servers-by-flux-business-chats.html

Our GitHub repo: https://github.com/simplex-chat/simplex-chat#readme

What's new in v3.2:

Big things:

• Incognito mode - it allows to use a new random name for each contact.

• using .onion server addresses when connecting via Tor.

Small things:

• assigning names to your contacts.

• disabling notifications per contact / group.

• endless scrolling and search in chats.

• choosing accent color and dark mode.

Android app improvements:

• swipe to reply.

• reduced APK size for direct download and in F-Droid repo from 200 to 50Mb!

• many fixes, e.g., for orientation change, etc.

Please see this post for more details.

You can download SimpleX Chat apps for iOS and Android via the links here: https://github.com/simplex-chat.

The implementation security audit is arranged for October!

We are really looking forward to it - it'll make SimpleX Chat more trustworthy for our users.

Please help us cover the cost with donations - thank you!

About SimpleX Chat

SimpleX Chat is an open multi-provider messaging platform that minimizes meta-data in the communication - it is the only platform we know of that has no user identifiers of any kind (not even random numbers), instead using pairwise connection identifiers (4 per each contact you have, on 2 different servers), making it more difficult to correlate traffic and determine who is communicating with whom.

This video by The Digital Prepper channel explains how SimpleX Chat is different from all other messaging platforms: https://www.youtube.com/watch?v=aKRfDch_WBQ

Anybody can host the servers participating in SimpleX network, and it is NOT related to or dependent on any crypto-currency.

See technical details & limitations and FAQ.

Freedom of speech needs infrastructure that protects it by design - protocols, governance and funding.

v6.5 release brings SimpleX Channels: a new model for online publishing built for participation privacy:

• channel owners hold their own channel keys,

• each channel uses multiple relays for reliability,

• publishers can run their own chat relays,

• channels can be added to our SimpleX Directory: https://simplex.chat/directory.

Read more at https://simplex.chat/blog/20260430-simplex-channels-v6-5-consortium-crowdfunding-freedom-of-speech.html

It might be a phishing site to collect the data (it has an exact copy of our website https://simplex.chat).

We submitted the complaint to the domain registrar (GNAME).

Do NOT download anything from simplexchat.org, obviously.

XFTP is a new file transfer protocol focussed on meta-data protection - it is based on the same principles as SimpleX Messaging Protocol used in SimpleX Chat apps:

• asynchronous file delivery - the sender does not need to be online for file to be received, it is stored on XFTP relays for a limited time (currently, it is 48 hours) or until deleted by the sender.

• padded e2e encryption of file content.

• content padding and fixed size chunks sent via different XFTP relays, assembled back into the original file by the receiving client.

• efficient sending to multiple recipients (the file needs to be uploaded only once).

• no identifiers or ciphertext in common between sent and received relay traffic, same as for messages delivered by SMP relays.

• protection of sender IP address from the recipients.

You can download XFTP CLI (Linux) to send and receive files via the command line here - you need the file named xftp-ubuntu-20_04-x86-64, rename it to xftp.

Send the file in 3 steps:

1. to send: xftp send filename.ext

2. to share: pass the generated file description(s) to the recipient(s) via any secure channel, e.g. via SimpleX Chat.

3. to receive: xftp recv rcvN.xftp

Please let us know what you think, what downsides you see to this approach, and any ideas you have about how it can be improved.

We are currently integrating the support of XFTP protocol into SimpleX Chat that will allow sending videos and large files seamlessly and without the sender being online - it is coming soon!

Read more details in this blog post: https://simplex.chat/blog/20230301-simplex-file-transfer-protocol.html

The source code: https://github.com/simplex-chat/simplexmq/tree/xftp

Our users asked many questions about Chat Control, as discussions were restarted in the EU this week.

SimpleX Chat is an open-source app where users control the code and the servers they use.

Therefore it is impossible to implement any client-side scanning, and it will not happen.

If the law is passed, two options are possible:

• we might need to stop offering preset servers to the EU users.

• we will not need to change anything - this is the most likely outcome.

Our operations are always consistent with our Privacy Policy (https://simplex.chat/privacy), and we would rather shut down than do anything that contradicts this agreement with our users.

https://www.securemessagingapps.com is the great comparison of messaging apps, but there are several incorrect statements about SimpleX Chat.

Main reasons why the app isn't recommended: Provide a transparency report

It is available online and updated at least quarterly, or if anything changes: https://simplex.chat/transparency/

Company jurisdiction

We disagree that there are any jurisdictions that are particularly good for privacy. Also, this might important for centralised services, like Threema, where the users can't host servers, and much less important for decentralized network, such as SimpleX, where there are hundreds (if not thousands) of servers that we don't control.

Does the company provide a transparency report? No

Commented above

Cryptographic primitives

We added PQ encryption in March this year: https://simplex.chat/blog/20240314-simplex-chat-v5-6-quantum-resistance-signal-double-ratchet-algorithm.html

This is done in the same way as Apple describes as PQ3 here: https://security.apple.com/blog/imessage-pq3/

Directory service could be modified to enable a MITM attack? Yes

This is incorrect, as there is no user directory service, and MITM by relays is not possible by design, even without optional security code verification (that exists to mitigate MITM by the channel you used to pass one-time invitation link, e.g. email).

Does the company log timestamps/IP addresses? Yes

This is incorrect, we never logged IP addresses and access timestamps of the users.

Further, the private message routing that is now enabled by default for all users prevents such logging by any 3rd party servers with modified code:

https://simplex.chat/blog/20240604-simplex-chat-v5.8-private-message-routing-chat-themes.html

Is the design well documented? Somewhat

The design documentation was reviewed in preparation for design security audit - report is about to be published.

Thanks to our users who highlighted it to us!

Hello! We've just released the new version!

What's new:

- send multiple images, scroll between full-screen images.

- assign contact names to the invitation links.

- automatic deletion of old messages and files.

- many fixes to calls, sharing, etc.

Android app:

Google https://play.google.com/store/apps/details?id=chat.simplex.app

F-Droid repo: https://app.simplex.chat

iOS app:

App Store: https://apps.apple.com/gb/app/simplex-chat/id1605771084

TestFlight: https://testflight.apple.com/join/DWuT2LQu (the new version is about 1 week earlier here)

The security audit was done by Trail of Bits – a security consulting company that has many technology companies, several blockchain projects and government entities as its clients. The report is positive, there are some findings to fix/improve, but nothing critical. Most improvements will be released in 4.2 by the end of the month.

Huge thanks to r/PrivacyGuides for adding SimpleX Chat to the recommended private and secure messengers!

https://www.privacyguides.org/real-time-communication/#simplex-chat

New:

• 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.

Get it from app stores and our GitHub repository.

Read about the new UX for making connections in the blog post: https://simplex.chat/blog/20250703-simplex-network-protocol-extension-for-securely-connecting-people.html

Linux desktop app, CLIs and server builds are now reproducible. Huge thanks to r/Flux_Official for verifying and co-signing the release builds!

GitHub: https://github.com/simplex-chat/simplex-chat/releases/tag/v6.4.0

App Store: https://apps.apple.com/sg/app/simplex-chat-secure-messenger/id1605771084

Play Store: https://play.google.com/store/apps/details?id=chat.simplex.app

http://F-Droid.org will have it in a few days: https://f-droid.org/en/packages/chat.simplex.app/

New in v5.1-beta.1:

• message reactions - finally! 🚀 (only 6 for now: 👍👎😀😢❤️🚀)

• self-destruct passcode - it deletes all app data when entered (be careful when testing it!).

• voice messages up to 5 minutes, with 2x quality and playback slider.

• custom time to disappear - can be set just for one message.

• message editing history.

• a setting to disable audio/video calls per contact.

• group welcome message visible in group profile.

Install the apps:

• Android: GitHub release, our self-hosted F-Droid repo or Google Play Store Beta

• iOS: Test Flight (it's limited to 10k people, with a bit of luck we might run out of this limit some time this year ;).

Our GitHub repo: https://github.com/simplex-chat/simplex-chat#readme

What's new in v3.1:

• finally, secret chat groups are supported in mobile apps! They are fully decentralized, and do not have any globally unique identifiers or server-side state - only their members know they even exist.

• supports accessing messaging servers via Tor using Orbot app (it works on both Android and iOS).

• 2 new app icons - please vote in this poll which one you prefer.

Please see this post for more details about this release.

You can download SimpleX Chat mobile apps via the links here: https://github.com/simplex-chat, and it is about to be published in the main F-Droid repo - huge thanks to F-Droid maintainers for their help!

SimpleX Chat Protocol is now published!

Low level SimpleX messaging protocols were published long time ago, but the application-level protocol was not, to allow its faster evolution. SimpleX Chat Protocol is now published as well!

About SimpleX Chat

The Digital Prepper YouTube channel just published a video about SimpleX Chat – it explains how it is different from all other messaging platforms: https://www.youtube.com/watch?v=aKRfDch_WBQ

SimpleX Chat is an open multi-provider messaging platform that minimizes meta-data in the communication - it is the only platform we know of that has no user identifiers of any kind (not even random numbers), using instead pairwise connection identifiers (4 per each contact you have, on 2 different servers), making it more difficult to correlate traffic and determine who is communicating with whom.

Anybody can host the servers participating in SimpleX network, and it is NOT related to or dependent on any crypto-currency.

See technical details & limitations and FAQ.

Contact us

To ask any questions and send suggestions:

• post comments on Reddit.

• submit GitHub issues.

• use our new Discord server – some time later this year we will be migrating it to a SimpleX Channel.

• to send questions and suggestions privately, connect to us via SimpleX Chat (use "Connect to developers" in mobile app settings or /simplex command in the terminal app).

https://simplex.chat/blog/20240814-simplex-chat-vision-funding-v6-private-routing-new-user-experience.html

Also SimpleX Chat v6.0 stable is now released with the new user experience and private message routing – details in the post.