Hey Product Hunt -- I'm Lionad, a web engineer building tools at the intersection of data visualization and developer experience. I built Project River because I kept running into the same problem: GitHub's built-in insights tell you *what* happened (commit counts, PR velocity), but not *who* the project depends on or *when* its community shifted. I wanted to see the full shape of a repository's history in a single glance. So I turned Git commit data into streamgraphs -- flowing, color-coded charts where every band is a contributor and the width represents their activity. The result is something you can actually *read*: you can spot when a key maintainer stepped back, see how a project's contributor base diversified after a major release, or identify bus-factor risks before they become emergencies. The demo has pre-loaded data for Vue.js, React, jQuery, and Atom so you can explore right away -- no signup, no install, no backend. https://lionad-morotar.github.io... A few things I'd love feedback on: **What other signals would be useful?** I'm currently surfacing contributor volume, concentration, and activity trends. What's missing -- code ownership heatmaps? PR review latency? Language distribution over time? Project River is open source. The source is here: https://github.com/Lionad-Morota... Thanks for checking it out.

Project River

See how your codebase evolved, contributor by contributor

See how your codebase evolved, contributor by contributor