Mastodon leads in popularity with 50,197 stars vs 18,202 stars for Bluesky. The 176% higher star count indicates stronger community adoption. In terms of developer contributions, Mastodon has 7,483 forks, indicating strong developer engagement.

Bluesky is growing faster, adding 85 stars in the last 30 days (+0.5%) against adding 93 stars for Mastodon (+0.2%). Bluesky is the smaller project of the two, so it is closing the gap rather than extending a lead.

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

Both tools share common technology foundations, being built with JavaScript, CSS, Typescript, JSX, Ruby. However, they differ in their additional technology choices: Bluesky uses Bash, Golang, Swift, Kotlin while Mastodon leverages SCSS, Rails.

Mastodon has been in development longer, starting 10 years ago, compared to Bluesky which began 4 years ago. This 6.4-year head start suggests Mastodon may have more mature features and established processes.

Bluesky uses the MIT license, which is more permissive than Mastodon's AGPL-3.0 license, potentially offering greater flexibility for commercial use and integration.

Both tools serve similar use cases in Decentralized Social Networks.

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