Comparison

Rocket.Chat vs Mattermost

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Rocket.Chat

A secure communication platform that integrates messaging, voice, video, and AI for organizations requiring high security and compliance. It offers features like E2E encryption and two-factor authentication to protect sensitive communications.

Highlights
  • Unified messaging, voice, and video
  • End-to-end encryption
  • Two-factor authentication
  • Open source software
  • On-premises or cloud hosting
  • Guest access
  • File sharing
Features
Read full description

Rocket.Chat Secure CommsOS™ is a communication platform that unifies messaging, voice, video, AI, and mission-critical applications—ensuring uncompromising security, compliance, and operational efficiency for governments, defense, and critical infrastructure organizations operating in high-stakes environments. The result is an increase in productivity and customer satisfaction rates. Everyday, tens of millions of users in over 150 countries and in organizations such as Deutsche Bahn, The US Navy and Credit Suisse trust Rocket.Chat to keep their communications completely private and secure. By opting for Rocket.Chat, users also benefit from free audio and video conferencing, guest access, screen and file sharing, LiveChat, LDAP Group Sync, two-factor authentication (2FA), E2E encryption, SSO, dozens of OAuth providers and unlimited users, guests, channels, messages, searches and files. Users can set up Rocket.Chat on cloud or by hosting their own servers on-premises. With thousands of contributors and stars on Github, Rocket.Chat has the world’s largest community of chat developers in the open source communication sector. When you choose Rocket.Chat, you join an ever-growing passionate community that constantly improves our platform with us :) KEY FEATURES: * Open Source Software * Hassle-free MIT license * BYOS (bring your own server) * Multiple Rooms * Direct Messages * Private & Public Channels/Groups * Desktop and Mobile Notifications * 100+ available integrations * Edit and Delete Sent Messages * Mentions * Avatars * Markdown * Emojis * Choose between 3 themes: Light, Dark, Black * Sort conversations alphabetically or group by activity, unread or favourites * Transcripts / History * File Upload / Sharing * I18n - [Internationalization with Lingohub] * Hubot Friendly - [Hubot Integration Project] * Media Embeds * Link Previews * LDAP Authentication * REST-full APIs * Remote Locations Video Monitoring * Native Cross-Platform Desktop Application

About

Mattermost

This platform enables secure messaging, file sharing, and workflow automation for critical industries. It offers voice calls, project management, and enterprise mobility management for enhanced collaboration and data control.

Highlights
  • Secure messaging, file, and link sharing
  • 1:1 and group voice calls
  • Workflow automation with Playbook
  • Enterprise Mobility Management support
  • Private mobility with ID-only push notifications
Features
Read full description

Requires Mattermost Server v11.7.0+. Older servers may not be able to connect or have unexpected behavior. ------- Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure. The platform runs on-premises and in private clouds, delivering secure messaging, file sharing, workflow automation, audio/screenshare, and project management—all with full data and operational control. - Securely share messages, files, and links across from your preferred mobile devices. - Start 1:1 and group voice calls with a single click without leaving Mattermost. - Keep critical workflows moving forward with Playbook. - Get the message out without having to manage every endpoint with Enterprise Mobility Management (AppConfig) support. - Private mobility with ID-only push notifications to keep sensitive data protected while keeping stakeholders informed. To use this app, you need a URL for a Mattermost server. ------- Deploy your own server: https://docs.mattermost.com/guides/deployment.html Terms of Service: https://mattermost.com/terms-of-service/ Contribute to the project: https://github.com/mattermost/mattermost-mobile

Screenshots

Rocket.Chat4 screens
Mattermost4 screens

Verdict

The call

The clearest difference is rating: Mattermost at 4.8 against Rocket.Chat's 4.4. Mattermost also leads on update cadence (every 8 days vs every 3 weeks). Rocket.Chat's advantage is review sentiment (62% vs 38%) and device support (4 vs 2). On price, ratings volume, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Mattermost holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 3.7K and 5.6K respectively. Written reviews complicate that: 62% of Rocket.Chat's written reviews are positive against 38% of Mattermost's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Rocket.Chat ships an update every 3 weeks, Mattermost every 8 days. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
Rocket.Chat versus Mattermost: the parameters behind the verdict, then further details
ParameterRocket.ChatMattermost
PriceFreeFree
Rating4.4 (3.7K ratings)4.8 (5.6K ratings) — better
Positive reviews61.7% of reviews — better37.6% of reviews
Number of ratings3.7K5.6K — better
Update frequencyEvery 3 weeksEvery 8 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.1 — better16.0
Further details — not scored
Size78 MB93 MB
Age rating9+4+
DeveloperRocket.Chat Technologies Corp.Mattermost, Inc.

Customer experience

Rocket.Chat

All ratings3,728 ratings
Positive84.8%
Neutral5.4%
Negative9.8%
Written reviews856 reviews
Positive61.7%
Neutral10.5%
Negative27.8%

Mattermost

All ratings5,643 ratings
Positive94.7%
Neutral1.7%
Negative3.6%
Written reviews497 reviews
Positive37.6%
Neutral15.1%
Negative47.3%

User reviews

Rocket.Chat

From 3.7K App Store ratings

What we love

  • 🚀 Robust and reliable
  • 🔒 Secure self-hosted chat
  • 👍 Intuitive and easy to use
  • 🙌 Great for team communication
  • 💻 Seamless desktop and mobile experience

Room to improve

  • 🐛 Occasional bugs and crashes
  • 🔍 Inconsistent search and navigation
  • 📢 Unreliable notification system
  • 🔒 Tricky privacy management
  • 🔄 Frequent login issues

Mattermost

From 5.6K App Store ratings

What we love

  • 🚀 Fast and responsive
  • 🔒 Secure self-hosted solution
  • 👍 Great Slack alternative
  • 💡 Customizable and extensible
  • 🧲 Integrates well with other tools

Room to improve

  • 🐛 Buggy and unstable
  • 🔑 Frustrating login/authentication issues
  • 🔔 Inconsistent or missing notifications
  • 🖼️ Trouble with image/file uploads
  • 🕰️ Slow performance and lag

Bugs and requests

Rocket.Chat

Reported bugs

5 issues
  • Messages not loading properly
  • Inability to stay logged in
  • Broken translation feature
  • Compatibility issues with newer devices
  • Admin panel not functioning on mobile

Requested features

5 requests
  • Improved notification settings
  • Enhanced file sharing and management
  • Customizable notification sounds
  • Streamlined admin panel for mobile
  • Integrated video/audio calling

Mattermost

Reported bugs

5 issues
  • Crashes on startup
  • Unread message indicators not working
  • Keyboard issues on iPad/desktop
  • Compatibility problems with iOS 17+
  • Randomly logs users out

Requested features

5 requests
  • Add voice messaging capability
  • Improve multi-server support
  • Integrate end-to-end encryption
  • Introduce iPad-optimized layout
  • Provide more customization options

In-app purchases

None

Rocket.Chat

No in-app purchases

None

Mattermost

No in-app purchases

Questions

Is Rocket.Chat free?
Rocket.Chat is free to download, with no in-app purchases.
Is Mattermost free?
Mattermost is free to download, with no in-app purchases.
Which has better reviews, Rocket.Chat or Mattermost?
Mattermost is rated higher. Rocket.Chat averages 4.4 out of 5 from 3.7K ratings, while Mattermost averages 4.8 from 5.6K ratings.
Do Rocket.Chat or Mattermost have ads?
Neither Rocket.Chat nor Mattermost shows ads.
Which is updated more often, Rocket.Chat or Mattermost?
Rocket.Chat ships an update every 3 weeks, and Mattermost every 8 days. Most recently, Rocket.Chat was updated on September 23, 2026 and Mattermost on September 22, 2026.

Other comparisons