Source: https://seerepo.com/compare/jj-vcs/jj/vs/xai-org/grok-build
Markdown source: https://seerepo.com/compare/jj-vcs/jj/vs/xai-org/grok-build.md
Description: jj and grok-build share 7 technologies: Tokio, crossterm, ansi-to-tui, Ratatui, tracing, tracing-chrome, and tracing-subscriber. Both are written in Rust.

# jj vs grok-build

jj and grok-build share 7 technologies: Tokio, crossterm, ansi-to-tui, Ratatui, tracing, tracing-chrome, and tracing-subscriber. Both are written in Rust.

- [jj-vcs/jj](https://seerepo.com/r/jj-vcs/jj): A Git-compatible VCS that is both simple and powerful
- [xai-org/grok-build](https://seerepo.com/r/xai-org/grok-build): SpaceXAI's coding agent harness and TUI. Fullscreen, mouse interactive, extensible.

## What they share and what sets them apart

- In common: Tokio, crossterm, ansi-to-tui, Ratatui, tracing, tracing-chrome, tracing-subscriber
- Only in jj: clru, sapling-renderdag, rpassword
- Only in grok-build: axum, aws-sdk-s3, rusqlite, SQLite, moka, sqlite-vec, OpenAI, Sentry, tower, axum-server, anstyle, fontdb, alacritty_terminal, ratatui-core, indicatif, tiny-skia, jsonwebtoken, oauth2, hmac, async-openai, agent-client-protocol, rmcp, bm25, kamadak-exif, image, minijinja, pulldown-cmark, infer, linkify, zip, htmd, html-escape, pdf_oxide, quick-xml, resvg, scraper, schemars, jsonschema, prometheus, OpenTelemetry, tracing-appender, tracing-opentelemetry, log, opentelemetry-otlp, fastrace-opentelemetry, opentelemetry-http, env_logger, prometheus-parse

## Side by side

| | jj | grok-build |
|---|---|---|
| Size | 284,964 lines written, 313 code files | 1,982,128 lines written, 2,511 code files |
| Who writes it | 0.1% of its commits signed by AI. With Gemini CLI and Claude Code | 0% of its commits signed by AI |
| Activity | Last push November 7, 2026, 12,142 commits, 32,392 stars | Last push September 29, 2026, 51 commits, 27,712 stars |
| Tests | 128 test files | 1,077 test files. 52.1% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, jj or grok-build?

grok-build, with 1,982,128 lines written; jj has 284,964.

The proof: [xai-org/grok-build's code at commit 2bdd1d6](https://github.com/xai-org/grok-build/tree/2bdd1d6a6369de0e8c68132ea4539e9abd9e14a8)

### Which has more GitHub stars, jj or grok-build?

jj, with 32,392 stars; grok-build has 27,712.

The proof: [jj-vcs/jj on GitHub](https://github.com/jj-vcs/jj)

### Which has more tests, jj or grok-build?

grok-build, with 1,077 test files; jj has 128.

The proof: [xai-org/grok-build's code at commit 2bdd1d6](https://github.com/xai-org/grok-build/tree/2bdd1d6a6369de0e8c68132ea4539e9abd9e14a8)

### Which was updated more recently, jj or grok-build?

jj: its last push was on November 7, 2026, and grok-build's on September 29, 2026.

The proof: [jj-vcs/jj's commits on GitHub](https://github.com/jj-vcs/jj/commits)

### Which has more commits signed by AI, jj or grok-build?

jj: an AI signed 0.1% of its commits, with Gemini CLI and Claude Code.

## Sources

- jj-vcs/jj: Read on November 7, 2026, at commit 7fdb0d1 (https://github.com/jj-vcs/jj/tree/7fdb0d1088f3592e73e31967b21322ef2299ce85)
- xai-org/grok-build: Read on November 8, 2026, at commit 2bdd1d6 (https://github.com/xai-org/grok-build/tree/2bdd1d6a6369de0e8c68132ea4539e9abd9e14a8)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.