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🔀Jujutsu

ACTIVE STEADY

jj-vcs/jj · homepage ↗

A Git-compatible VCS that is both simple and powerful

⭐ Very popular: 31k stars, gaining about 129 a week

View on GitHub ↗

repo profile

vintage 2020 6 years old
delivery product
language Rust
license Apache-2.0

momentum

total stars 31k
stars added last week +129
HN peak 158 pts 1y 6mo ago
binary downloads 13k total · GitHub releases
used by 93 repos & packages
commits / week 17 steady · -14% vs prior mo
issues closed 52% ~1 day to close, median
contributors 370 (+3 in 15d)
release cadence monthly
last activity yesterday

durability

backing community / independent community (originated at Google)
openness permissive
security score 7.2/10 OpenSSF Scorecard · 2026-08-14
bus factor 2 concentrated
top-author share 27% 6 mo

bus factor = how many people it takes to cover more than half the commits (6 months). 1 is a solo project; higher means the work is spread across a team. top-author share is the single busiest author's slice of those commits.

since we covered it

monthly average + 1k/mo (+8%/mo) · + 17k total since PR#8

why it's a big deal

  • Conflict-First Design: Tracks conflicts as structured objects, enabling smarter rebases and auto-resolutions.
  • Operation Log with Undo: Every action is recorded and reversible, simplifying error recovery.
  • Working-Copy-as-Commit: No index or stash, every file change is instantly versioned, streamlining workflows.

under the hood

  • Git-Compatible Storage: Uses Git repos as backend while abstracting VCS logic for future extensibility.
  • Rust-Powered Performance: Safe, concurrent operations designed for scale and reliability.
  • Advanced History Tools: Commands like jj split and jj squash offer intuitive, granular control over commit history.

our take from PR#8, 2025-05-14

star history

PR#8 · 14k31k now Dec 2020Aug 2026
  1. PR#8 14k 2025-05-14
  2. now 31k + 17k since first covered

curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.

understory

Quietly building: more output than attention, for now.

+11 understory score output 79 · clout 68
Aug 2025 Jul 2026
  • output, commits & releases
  • clout, star velocity

output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →

covered in

  • PR#8 2025-05-14 on the radar

    A Git-Compatible, Conflict-First Version Control System Built for Modern Workflows

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