They also have horrible android client and you have to pay for mobile notifications.

I ended up using matrix/riot instead. Much better clients and grows nicely.

Hi omnimus, thanks for the mention.

Mattermost has a brand new, open source Android client in beta written in React Native used by thousands of testers: https://play.google.com/store/apps/details?id=com.mattermost...

It's greatly improved from the original version and official release is this month.

Mattermost mobile notifications aren't a commercial feature, they are just off by default due to privacy (push notifications appear on a mobile device when the device is locked).

Go to System Console > Notifications > Mobile Push > Send Push Notifications to enable.

You can also deploy your own Mattermost Push Notification Server (https://github.com/mattermost/mattermost-push-proxy) and compile your own Mattermost Android and iOS apps (https://github.com/mattermost/mattermost-mobile) for total control.

Sadly the Android's react version seems to lack any share features - the app doesn't appear in any 'share to' dialogues, nor can I share pictures or such from the app itself (For example using rocket.chat I can long press on an image and I will be able to share the picture to other apps). The issue appears to only have around 100 combined votes on uservoice (https://mattermost.uservoice.com/forums/306457-general/sugge... + https://mattermost.uservoice.com/forums/306457-general/sugge...) so I'm not holding my breath for this to be implemented anytime soon, but it would be a really useful feature to have for when you need to move graphical assets around and you want to take a quick look on your phone for example.