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update font matter and update links in new blog.

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blog/20220808-simplex-chat-v3.1-chat-groups.md
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---
layout: layouts/article.html
title: "SimpleX Chat v3.1 is released"
date: 2022-08-08
---
# SimpleX Chat v3.1 is released
**Published:** Aug 8, 2022
## What's new
- [secret chat groups](#secret-chat-groups)!
- [access to messaging servers via Tor](#access-to-messaging-servers-via-tor)
- [advanced network settings](#advanced-network-settings)
- [published chat protocol](#published-chat-protocol)
- [new app icons](#new-app-icons)
- [other changes since v3](#other-changes-since-v3)
- [secret chat groups](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220808-simplex-chat-v3.1-chat-groups.md#secret-chat-groups)!
- [access to messaging servers via Tor](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220808-simplex-chat-v3.1-chat-groups.md#access-to-messaging-servers-via-tor)
- [advanced network settings](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220808-simplex-chat-v3.1-chat-groups.md#advanced-network-settings)
- [published chat protocol](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220808-simplex-chat-v3.1-chat-groups.md#published-chat-protocol)
- [new app icons](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220808-simplex-chat-v3.1-chat-groups.md#new-app-icons)
- [other changes since v3](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220808-simplex-chat-v3.1-chat-groups.md#other-changes-since-v3)
- optimized battery and traffic usage - up to 90x reduction!
- two docker configurations for self-hosted SMP servers
@@ -17,9 +22,9 @@
<img src="./images/20220808-group1.png" width="330"> <img src="./images/20220808-group2.png" width="330"> <img src="./images/20220808-group3.png" width="330">
It's been [nearly a year](./20210914-simplex-chat-v0.4-released.md) since the users of SimpleX Chat terminal app started experimenting with the groups, and now it is available to mobile app users as well. Many bugs were fixed, the stability was improved, but there are both the features we need to add and the bugs we need to fix to make groups more useful - we really look forward to your feedback. You can send any suggestions via the app by choosing `Chat with the developers` via app Settings (or using `/simplex` command in the terminal app) – this would connect you to SimpleX team via its [fixed chat address](https://simplex.chat/contact#/?v=1&smp=smp%3A%2F%2FPQUV2eL0t7OStZOoAsPEV2QYWt4-xilbakvGUGOItUo%3D%40smp6.simplex.im%2FK1rslx-m5bpXVIdMZg9NLUZ_8JBm8xTt%23MCowBQYDK2VuAyEALDeVe-sG8mRY22LsXlPgiwTNs9dbiLrNuA7f3ZMAJ2w%3D).
It's been [nearly a year](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20210914-simplex-chat-v0.4-released.md) since the users of SimpleX Chat terminal app started experimenting with the groups, and now it is available to mobile app users as well. Many bugs were fixed, the stability was improved, but there are both the features we need to add and the bugs we need to fix to make groups more useful - we really look forward to your feedback. You can send any suggestions via the app by choosing `Chat with the developers` via app Settings (or using `/simplex` command in the terminal app) – this would connect you to SimpleX team via its [fixed chat address](https://simplex.chat/contact#/?v=1&smp=smp%3A%2F%2FPQUV2eL0t7OStZOoAsPEV2QYWt4-xilbakvGUGOItUo%3D%40smp6.simplex.im%2FK1rslx-m5bpXVIdMZg9NLUZ_8JBm8xTt%23MCowBQYDK2VuAyEALDeVe-sG8mRY22LsXlPgiwTNs9dbiLrNuA7f3ZMAJ2w%3D).
SimpleX network is decentralized, so how do groups work? Unlike Matrix or Signal that host the group profile and the list of group members on their servers, SimpleX servers have no information about the group's existence - only its members do. SimpleX network does not assign any globally unique identifiers to the group, there is only a local database identifier and the list of members stored on members' devices. A user has an independent connection to each member in a group. When a user sends a message to the group, the app sends this message independently to each member. You can read more about how groups work in [SimpleX Chat Protocol](../docs/protocol/simplex-chat.md#sub-protocol-for-chat-groups).
SimpleX network is decentralized, so how do groups work? Unlike Matrix or Signal that host the group profile and the list of group members on their servers, SimpleX servers have no information about the group's existence - only its members do. SimpleX network does not assign any globally unique identifiers to the group, there is only a local database identifier and the list of members stored on members' devices. A user has an independent connection to each member in a group. When a user sends a message to the group, the app sends this message independently to each member. You can read more about how groups work in [SimpleX Chat Protocol](https://github.com/simplex-chat/simplex-chat/blob/stable/docs/protocol/simplex-chat.md#sub-protocol-for-chat-groups).
But how can it scale, you might ask? It simply won't, and the current design for the groups is only suitable for relatively small groups of people who know each other well, definitely not larger than few hundred members – this design prioritized privacy and security of the group over its size or performance. For example, to send a message to the group of 100 members a user would need to send a total of ~1.6mb of data (as each message uses a fixed size block of 16kb). And if you were to send a 1mb file then it would also require sending it 100 times (provided each member accepts it).
@@ -42,7 +47,7 @@ But there are scenarios when users need to protect their IP addresses from the s
This release allows to access SimpleX messaging servers via Tor on all platforms:
- terminal app beta supported it for a couple weeks now: to access SimpleX servers via Tor you need to install Tor proxy and run simplex-chat with `-x` option. See [terminal app docs](../docs/CLI.md#access-messaging-servers-via-tor-beta) for more information.
- terminal app beta supported it for a couple weeks now: to access SimpleX servers via Tor you need to install Tor proxy and run simplex-chat with `-x` option. See [terminal app docs](https://github.com/simplex-chat/simplex-chat/blob/stable/docs/CLI.md#access-messaging-servers-via-tor-beta) for more information.
- Android app supports access via Tor using Orbot SOCKS proxy. Once you install and start Orbot, you need to enable `Network & Servers / Use SOCKS proxy` setting in the app to access SimpleX servers via Tor.
- iOS app can also be used with Orbot iOS app (that is installed as a system-wide VPN provider). The only setting you might need to change is to increase network timeouts in the app - to do that you have to enable `Developer tools`, and then chose `Network & Servers / Advanced network settings / Set timeouts for proxy`.
@@ -69,23 +74,23 @@ More options to customize the app are coming - please let us know what are the m
The [low level SimpleX protocols](https://github.com/simplex-chat/simplexmq/blob/stable/protocol/) were published long time ago, and updated to reflect the evolution of the protocols, the high level chat protocol was not published before. The reason for that was to allow us to iterate it quickly, without committing to any of the decisions.
This is the [first draft of SimpleX Chat Protocol](../docs/protocol/simplex-chat.md) - let us know any questions or suggestions.
This is the [first draft of SimpleX Chat Protocol](https://github.com/simplex-chat/simplex-chat/blob/stable/docs/protocol/simplex-chat.md) - let us know any questions or suggestions.
### Other changes since v3
Since v3 release we also optimized battery and traffic usage - with up to 90x traffic reduction in some cases – and published two docker configurations for self-hosted SMP servers. Read more about it in the previous [beta version announcement](./20220723-simplex-chat-v3.1-tor-groups-efficiency.md).
Since v3 release we also optimized battery and traffic usage - with up to 90x traffic reduction in some cases – and published two docker configurations for self-hosted SMP servers. Read more about it in the previous [beta version announcement](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220723-simplex-chat-v3.1-tor-groups-efficiency.md).
## SimpleX platform
Some links to answer the most common questions:
[How can SimpleX deliver messages without user identifiers](./20220511-simplex-chat-v2-images-files.md#the-first-messaging-platform-without-user-identifiers).
[How can SimpleX deliver messages without user identifiers](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220511-simplex-chat-v2-images-files.md#the-first-messaging-platform-without-user-identifiers).
[What are the risks to have identifiers assigned to the users](./20220711-simplex-chat-v3-released-ios-notifications-audio-video-calls-database-export-import-protocol-improvements.md#why-having-users-identifiers-is-bad-for-the-users).
[What are the risks to have identifiers assigned to the users](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220711-simplex-chat-v3-released-ios-notifications-audio-video-calls-database-export-import-protocol-improvements.md#why-having-users-identifiers-is-bad-for-the-users).
[Technical details and limitations](./20220723-simplex-chat-v3.1-tor-groups-efficiency.md#privacy-technical-details-and-limitations).
[Technical details and limitations](https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20220723-simplex-chat-v3.1-tor-groups-efficiency.md#privacy-technical-details-and-limitations).
[How SimpleX is different from Session, Matrix, Signal, etc.](../README.md#frequently-asked-questions).
[How SimpleX is different from Session, Matrix, Signal, etc.](https://github.com/simplex-chat/simplex-chat/blob/stable/README.md#frequently-asked-questions).
## We ask you to help us pay for 3rd party security audit