Commit Velocity Explained: What Investors Need to Know
Commit velocity is the total number of commits to a startup's GitHub repository over a rolling 14-day window. Learn what it measures, what it misses, and how to interpret it for deal sourcing.
Key Takeaway
Commit velocity counts the total commits to a startup's most active public repository over 14 days. As a standalone metric it is noisy - commit size, quality, and automation all create false signals. What matters for investors is commit velocity change: the rate at which velocity is accelerating or decelerating. A +150% velocity change classifies as a deploy frequency spike, while sustained positive change across multiple windows indicates genuine engineering momentum.
Commit velocity is one of the most cited - and most misunderstood - metrics in GitHub-based deal sourcing.
What Is Commit Velocity?#
Commit velocity is the total number of commits to a startup's most active public GitHub repository over a rolling 14-day window. At VC Deal Flow Signal, we pull this data from the GitHub API's commit activity endpoint [1].
The metric is intentionally simple: count the commits. No weighting by lines of code, no filtering by author, no adjustment for commit size. Simplicity makes it comparable across companies and sectors.
What Does Commit Velocity Actually Measure?#
Commit velocity measures engineering output volume - how much work is being pushed to version control. It is a proxy for engineering activity, not engineering quality.
A startup with 200 commits in 14 days has roughly 14 commits per day. For a team of 10 engineers, that is a healthy shipping cadence. For a solo founder, it might indicate automated tooling or excessive granularity.
What Are the Limitations?#
Commit velocity has known limitations that investors should understand:
Commit size varies: One commit might change a single config line; another might refactor 5,000 lines. Velocity treats them equally.
Automation inflates counts: CI/CD bots, automated dependency updates, and auto-formatting tools can inflate commit counts without meaningful engineering work.
Private repos are invisible: Many startups keep their core product code in private repositories. Commit velocity only captures public activity.
Squash vs. merge: Teams that squash commits will show lower velocity than teams that merge individual commits. This is a workflow choice, not a quality signal.
Why Commit Velocity Change Matters More#
This is the key insight: absolute commit velocity is noisy. Commit velocity change - the rate at which velocity is accelerating - is the real signal. See our detailed guide on how to read GitHub signals for startup investing.
A startup going from 20 to 40 commits in a 14-day window shows +100% velocity change. That acceleration has meaning regardless of the absolute numbers - something changed in how the team is working. That something is what investors care about.
Visit our glossary for formal definitions of all engineering metrics.