Mattermost

4.7
18.8K reviews
1M+
Downloads
Content rating
Everyone
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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
Feb 16, 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

4.7
18.3K 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.
6 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.
Sidney Simmons
June 6, 2023
Currently not able to open an image posted by another user. Tapping the image doesn't do anything. No error message or anything. Server version 7.1.5. Just a normal png screen capture and it isn't consistent. Maybe related to network quality? If so something indicating it's trying would be helpful. Edit: I'll ask about the server upgrade. Is 7.8 the latest?
7 people found this review helpful
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Mattermost
June 6, 2023
Hi Sidney, to eliminate any server side issues, would your system admin be open to upgrading the server to a more recent version, such as 7.8 which is the latest ESR version?
Mike Boom
February 3, 2023
When it works, it's great. But the bugs are app breaking. The app will randomly cause sign in issues, where you are required to sign in every time you open the app. Even if it's cached. It stays signed in on the server side, and can receive push notifications to your phone. It leaves me with such a bad taste that I don't even want to use the app. It started Jan 2021, and randomly comes and goes. Happens to my coworkers too so I know it's not me.
19 people found this review helpful
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Mattermost
March 9, 2021
Frequent logouts from the app have been experienced on the latest Android OS. Some ways to recover include logging out from the app and then uninstalling and installing the app, as well as restarting the device.

What’s new

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

- Added support for emoji picker on mobile.
- Added an option to rename playbook runs/checklists on mobile.
- Added support for viewing and editing playbook run attributes.
- Added support for deleting Playbook tasks from mobile.
- Added various bug fixes.