Mattermost vs Riot: What are the differences?

What is Mattermost? Open-source, self-hosted, Slack alternative. Mattermost is modern communication from behind your firewall.

What is Riot? A React-like user interface micro-library. Riot brings custom tags to all browsers. Think React + Polymer but with enjoyable syntax and a small learning curve.

Mattermost and Riot are primarily classified as "Group Chat & Notifications" and "Javascript UI Libraries" tools respectively.

Some of the features offered by Mattermost are:

• All your team communication in one place, searchable and accessible anywhere
• Slack-compatible, not Slack-limited. Imports Slack channels, users and themes. Offers Slack-compatible webhooks and integrations including Hubot, Jenkins, GitLab and others
• Self-host ready with System Console and IT admin tools for managing dozens of team sites. Installs with Linux binary, plus Docker, Heroku, AWS, Azure and Cloud Foundry options

On the other hand, Riot provides the following key features:

• Absolutely the smallest possible amount of DOM updates and reflows.
• One way data flow: updates and unmounts are propagated downwards from parent to children.
• Expressions are pre-compiled and cached for high performance.

"Open source" is the primary reason why developers consider Mattermost over the competitors, whereas "Light weight. Fast. Clear" was stated as the key factor in picking Riot.

Mattermost and Riot are both open source tools. It seems that Mattermost with 15.5K GitHub stars and 3.15K forks on GitHub has more adoption than Riot with 13.7K GitHub stars and 1.02K GitHub forks.

Uber Technologies, DuckDuckGo, and Mattermost are some of the popular companies that use Mattermost, whereas Riot is used by BestFone 2.0, Thanx, and Walla!. Mattermost has a broader approval, being mentioned in 38 company stacks & 24 developers stacks; compared to Riot, which is listed in 9 company stacks and 6 developer stacks.