sem

' sem fixes that. Instead of line-by-line diffs, it gives you entity-level diffs: which functions changed, which classes were renamed, which dependencies shifted. Consider it version control that understands code structure, not just text.

It supports 21 languages, runs as a CLI, and adds blame, graph, and impact analysis on top of the structural diff. The impact analysis is the real selling point: change a function and sem tells you what else in your codebase is affected.

Written in Rust, Apache 2.0, fully free. No paid tier, no cloud, no account. Install the CLI and go.

The catch: nascent stage. The concept is excellent but the ecosystem is tiny. If your language isn't in the 21 supported, you're out of luck. And at this star count, expect rough edges and sparse docs.