Mattermost

Name: Mattermost
Availability: InStock
Rating: 4.75 (17302 reviews)
Author: Mattermost

4.8

17.3K reviews

1M+

Downloads

Everyone

About this app

Requires Mattermost Server v10.5.0+. 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

Sep 15, 2025

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

16.8K reviews

Nicole F (Cole)

August 12, 2025

YMMV but it was unusable for me. Constantly refuses to connect to server. I *might* get logged in but then it's all downhill from there with multiple connection errors. Most of the time can't even get it to log in. Network is fine, no other apps experiencing this. Tried uninstalling and reinstalling multiple times but no good. Tried adjusting settings but no good.

2 people found this review helpful

Mattermost

August 12, 2025

Hi there, can you help with more details on reproduction steps and your Mattermost server version? Feel free to open a new issue with details at https://github.com/mattermost/mattermost-mobile/issues.

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

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

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?

What’s new

Requires Mattermost server v10.5.0+ to avoid incompatibilities and crashes. Requires Android 7.0 or higher.

- Updated the app to target Android 15 (API level 35).
- Added a new pre-authentication secret configuration to the server connection. This secret will be sent as a header in every request made to the Mattermost instance.
- Added various bug fixes.

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