Ideas
debuggingtestinggit

Git diff for runtime behavior

Develop a tool that compares not just code changes but actual runtime behavior differences between software versions. Helps catch subtle bugs in updates.

Why now

As codebases grow more complex, traditional diffs miss behavioral regressions that only appear during execution.

Who for
Software engineering teams
Business model
Paid licenses
Effort
A few weeks

Developers struggle to identify subtle behavior changes that don't show up in code diffs.

Build a lightweight library that instruments code to compare execution paths and outputs between versions.

Sell to engineering teams as a premium debugging tool, with enterprise licensing.

Start with basic function-level comparison for one language like Python.

Risk: Performance overhead and getting adoption in established workflows.

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Git diff for runtime behavior — Ideas