jj vs codex
jj and codex share 6 technologies: Tokio, crossterm, ansi-to-tui, Ratatui, tracing, and tracing-subscriber. Both are written in Rust.
LinkedInWhat they share and what sets them apart
jj-vcs
jj
A Git-compatible VCS that is both simple and powerful
Rust32.4kRead on November 7, 2026, at commit 7fdb0d1What is jj built with?Only in jj
- clru
sapling-renderdag
rpassword
- tracing-chrome
In common
openai
codex
Lightweight coding agent that runs in your terminal
Rust133.9kRead on November 9, 2026, at commit 6107b98What is codex built with?Only in codex
- axum
- codex-attachment-store
- codex-cloud-tasks-client
- codex-queue-extension
- codex-thread-store
- codex-utils-cache
- sqlx-sqlite
- sqlx
libsqlite3-sys
- lru
- SQLite
- Sentry
rama-http
- tiny_http
- tower
objc2-app-kit
- two-face
- codex-tui
- ratatui-macros
- sqlx-macros
- codex-aws-auth
- codex-keyring-store
- codex-login
- codex-user-verification
- codex-websocket-auth
- codex-workload-identity
- oauth2
- keyring
- jsonwebtoken
- ed25519-dalek
- hmac
- codex-agent-graph-store
- codex-agent-identity
- codex-agent-message-board-client
- codex-agent-message-board-extension
- codex-agent-roles
- codex-chatgpt
- codex-client
- codex-code-mode-runtime
- codex-collaboration-mode-templates
- codex-context-fragments
- codex-core-plugin-common
- codex-extension-api
- codex-external-agent-migration
- codex-guardian-context
- codex-guardian-reviewer
- codex-image-generation-extension
- codex-lmstudio
- codex-mcp
- codex-mcp-extension
- codex-memories-extension
- codex-memories-read
- codex-memories-write
- codex-message-board-mcp
- codex-model-provider
- codex-model-provider-info
- codex-models-manager
- codex-ollama
- codex-plugin-host
- codex-prompts
- codex-protocol
- codex-response-debug-context
- codex-runtime-agent-instance
- codex-skills
- codex-skills-extension
- codex-tools
- codex-web-search-extension
openai-codex-cli-bin
- rmcp
- bm25
- codex-mermaid
- codex-utils-image
- codex-utils-template
- png
- image
- pulldown-cmark
- zip
- linkify
- quick-xml
- symphonia
- schemars
- Pydantic
- codex-otel-trace-websocket
- codex-rollout-trace
- tracelogging
- OpenTelemetry
- tracing-opentelemetry
- log
opentelemetry-otlp
tracing-appender
- opentelemetry-semantic-conventions
Side by side
jjcodex
SizeLines written by people and agents, without generated ones; code files, without tests.
jj284,964 lines written313 code files
codex2,374,591 lines written4,286 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
jj0.1% of its commits signed by AIWith Gemini CLI and Claude Code
codex2.7% of its commits signed by AIWith Codex, Claude Code, and GitHub Copilot
ActivityFrom GitHub and its history, on the day SeeRepo read it.
jjLast push November 7, 202612,142 commits32,392 stars
codexLast push November 9, 202613,317 commits133,900 stars
TestsThe files that test the code, and the share of code files a test imports.
jj128 test files
codex2,509 test files51.9% of its code files have a test that imports them
Frequently asked questions
Which is bigger, jj or codex?
codex, with 2,374,591 lines written; jj has 284,964.
The proof: openai/codex's code at commit 6107b98
Which has more GitHub stars, jj or codex?
codex, with 133,900 stars; jj has 32,392.
The proof: openai/codex on GitHub
Which has more tests, jj or codex?
codex, with 2,509 test files; jj has 128.
The proof: openai/codex's code at commit 6107b98
Which was updated more recently, jj or codex?
codex: its last push was on November 9, 2026, and jj's on November 7, 2026.
The proof: openai/codex's commits on GitHub
Which has more commits signed by AI, jj or codex?
codex: an AI signed 2.7% of its commits, with Codex, Claude Code, and GitHub Copilot; in jj, 0.1%.
The proof: the commits each tool signed in openai/codex
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