Both tools have similar popularity levels, with Buzz having 27,109 stars and Mattermost having 38,757 stars on GitHub. In terms of developer contributions, Mattermost has 8,899 forks, indicating strong developer engagement.

Buzz is growing faster, adding 23,454 stars in the last 30 days (+642%) against adding 326 stars for Mattermost (+0.8%). Buzz is the smaller project of the two, so it is closing the gap rather than extending a lead.

Both projects show recent activity, with Buzz last updated 1 hour ago and Mattermost 2 hours ago.

Both tools share common technology foundations, being built with JavaScript, CSS, Bash, Typescript, JSX. However, they differ in their additional technology choices: Buzz uses Python, C, Rust, Objective-C, Swift, Kotlin, Tauri, Dart while Mattermost leverages SCSS, Golang.

Mattermost has been in development longer, starting 11 years ago, compared to Buzz which began 5 months ago. This 10.9-year head start suggests Mattermost may have more mature features and established processes.

Buzz is licensed under Apache-2.0, while Mattermost's license terms are not publicly specified.

Both tools serve similar use cases in Team Chat & Messaging. However, they also have distinct specializations: Mattermost extends into Collaborative Workspaces, Encrypted Communication.

Mattermost provides self-hosting options for complete data control and customization, while Buzz may be primarily cloud-based or require different deployment approaches.