Mattermost

4.6
20.1K reviews
Content rating
Everyone
1M+
Downloads
Content rating
Everyone
Users Interact
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About this app

Requires Mattermost Server v10.11.0+. Older servers may not be able to connect or have unexpected behavior.

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Mattermost is secure workplace messaging from behind your firewall.

- Discuss topics in private groups, one-to-one or team-wide
- Easily share and view image files
- Connect in-house systems with webhooks and Slack-compatible integrations

To use this app, you need a URL for a Mattermost server.

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Host your own server: https://about.mattermost.com/download

Terms of Service: http://about.mattermost.com/terms/

Contribute to the project: https://github.com/mattermost/mattermost-mobile
Updated on
Jun 23, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Messages and 3 others
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.6
19.5K reviews
Lisa Willis
June 13, 2024
Extremely slow. I've had this app for awhile now (a couple years now) due to work and it's horrible. If they actually get the app running smoother and faster I would be shocked. Update: still slow. Also if you need to actually get a DM then you won't get it on the app. The desktop version works fine (just don't expect to be able to communicate with your job if you actually NEEDED to do so in the event of an emergency because it's actually happened with me). WiFi or LTE is still the same speed.
8 people found this review helpful
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Mattermost
January 2, 2024
Hi there, can you help share more details on the issue that you're experiencing? Please open a new issue at https://github.com/mattermost/mattermost-mobile/issues.
Alex Mirchuk
December 9, 2021
Rarely gives notifications, conversations don't update reliably so if i send a message on my phone it won't appear on a computer. file transfer is very limited and absolutely no video sharing capability. I've had other issues but I can't even remember them all. Lately its started just logging me out and ejecting me from the server, so now I'm definitely not getting any messages, so that's been fun. (The name is also super cumbersome but that's neither here nor there. )
19 people found this review helpful
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Mattermost
December 9, 2021
Hi, could you please share details on the issue with us on feedback@mattermost.com so that we can get in touch with you and resolve the issue?
Wil Maguire
February 17, 2023
Version 2.1.0 UX worse. Every time, every day, not a hyperbole, I try to go to an unread channel it first loads the channel like it's the first time I'm entering it, then it seems to load the last cached data, then if I'm lucky or wait long enough I get the actual unread message to appear. Sometimes the channel never loads any data, so I go back to unread and the channel is no longer marked unread, then it's a click into find channels to find it at the top, once again no new msg, restart app.
9 people found this review helpful
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Mattermost
February 17, 2023
Hi there, can you please share more details on this issue, including reproduction steps and your Mattermost server version? Please open a new issue at https://github.com/mattermost/mattermost-mobile/issues.

What’s new

Requires Mattermost server v10.11.0+ to avoid incompatibilities and crashes. Requires Android 7.0 or higher.

- Fixed a crash while showing the emoji reaction list.
- Fixed a crash on Android when the application started and also fixed other less common crashes.