A fast, keyboard-friendly client for Jujutsu. The change graph, diffs, splits, and conflicts, in one window.
Changes, bookmarks, revsets, and mutable history, the way jj intends. No git branches bolted on.
SwiftUI on macOS and GPUI on Linux, over a shared Rust core that links jj-lib directly. No CLI scraping, no web view.
No subscription and no repository data. Anonymous build and OS stats can be turned off in Settings.
Unified or side-by-side, a file tree, tree-sitter highlighting with intraline changes, and rich previews for images, Markdown, notebooks, CSV/TSV, SARIF, and binary plists.
Press Space to review a file, or click a hunk's gutter stripe to mark just that part. Reviewed hunks survive edits and rebases, and notes stay on the changed line.
Coding agents can read your notes and mark files with the jayjay CLI. Install the JayJay skill with npx skills add hewigovens/jayjay --skill jayjay, or on macOS from Settings > Integrations.
Pick hunks or individual lines from any file in the change, then split that selection into a clean child or parallel change.
Shift-click two changes, two bookmarks, or a PR branch and its base to see exactly what moved between them. For a divergent change, Compare Divergent Versions shows which one to keep.
Right-click the tip of a linear stack and choose Create / Update Stacked PRs. JayJay names a branch per change, pushes them, and opens one GitHub PR, GitLab MR, or Cursor Origin PR per change with dependent bases.
Sign in to GitHub and GitLab from Settings, or use an existing CLI login or environment token. Cursor Origin uses your origin auth login credentials.
Take Left, Right, or Base per hunk in the built-in merge editor, edit the raw markers, and save a partial resolution when work remains. Or hand off to your configured external tool.
Every snapshot of a change over time, with filtering and one-click restore. Undo a rebase or recover lost work without touching the op log by hand.
Every abandon, rebase, and split is an operation. Click the last one in the status bar, or press ⌘⇧U, to open the operation log and restore the repository to any earlier point.
Fork and merge lanes, shortest change IDs, and revset filtering with preset chips.
Drag a bookmark onto any change to move it. Per-remote ahead, behind, and diverged state.
See which change last touched each line of a file.
Change descriptions drafted by Codex, Claude, or Apple Intelligence.
VS Code, VSCodium, Zed, Xcode, Vim, Terminal, iTerm2, and Ghostty.
Colocated Git repos, Git LFS, and submodules work out of the box.
JayJay Diff Review GitHub pull requests in your browser, with review marks that survive force-pushes.
Fuzzy-search any operation in the command palette, type help split to discover features, or prefix ! to run raw jj with inline output.
macOS 26 or later · Apple silicon · signed and notarized
# Homebrew trusts the cask the first time $ brew install --cask hewigovens/tap/jayjay $ jayjay ~/my-project
Or download the app.
x86_64 & aarch64 · AppImage, Debian/Ubuntu, Arch
# Debian package or AppImage; checksum verified $ curl -fsSL https://jayjay.hewig.dev/install.sh | bash # Arch: AUR $ yay -S jayjay-appimage
Packages are on GitHub Releases.
Windows: Get JayJay from the Microsoft Store, or download a portable beta ZIP. Install jj separately.
Jujutsu has a better model than git, but most GUIs either think in git branches or run a web app in a shell. JayJay started from one question: why isn't there a true native client that speaks jj?
So it's opinionated and fast: one native way to do each workflow, the way jj intends. JayJay is 100% free, built by a developer for developers. Every detail matters, down to a hidden easter egg. Can you find it?
A native GUI for Jujutsu (jj) on macOS and Linux — the version control system that reimagines the git model with mutable history, changes instead of commits, and bookmarks instead of branches. Built with Rust (wrapping jj-lib directly, no CLI scraping) and SwiftUI.
Yes — JayJay is a full-featured native jj GUI for macOS and Linux: DAG visualization, unified + side-by-side diffs with tree-sitter highlighting, interdiff, diff edit mode, file annotate, one-click conflict resolution, and every common jj operation (squash, split, absorb, revert, merge, duplicate, describe, abandon) without memorizing flags.
brew install --cask hewigovens/tap/jayjay is the easiest path — Homebrew 6.0 trusts the cask the first time you install it. Or download the signed, notarized app from GitHub Releases. Requires macOS 26 or later.
Yes. Shift-click two revisions in the DAG to compare them PR-style — the same unified and side-by-side views with word-level highlighting, rendering the difference between the two change contents.
Yes. Toggle unified and side-by-side with one click. Both use tree-sitter syntax highlighting and word-level highlights. Image files (PNG, JPG, SVG, HEIC...) render as actual before/after images, and Markdown, notebooks, CSV/TSV, SARIF, and binary property lists have rich previews when source text is not enough.
Yes — that's diff edit mode. Select files, hunks, or line ranges and split them into a new child or parallel change. On the working copy you can also right-click → Abandon Selected Lines to drop individual edits.
It complements the CLI rather than replacing it. The DAG graph, visual diff review, diff-edit, evolution viewer, and bookmark manager are far easier in a GUI. The command palette (⌘ ⇧ P) searches actions and local help, and takes a jj (or !) prefix to run raw jj in-window.
Free and source-available. The macOS app is BSL 1.1 — free to use, fork, modify, and redistribute; only paid app-store distribution needs permission. It converts to Apache-2.0 on 2030-03-23. The Rust crates are Apache-2.0 today.
Run curl -fsSL https://jayjay.hewig.dev/install.sh | bash. The script installs the latest Debian package on apt-based systems and the AppImage elsewhere for x86_64 or aarch64, after verifying its checksum; run it again to upgrade. On Arch Linux, install jayjay-appimage from AUR, for example with yay -S jayjay-appimage. Add --beta to install the newest beta when it is ahead of stable. Then run jayjay /path/to/repo or open a repository from the window. The guide lists what it covers.
Install jayjay-appimage from AUR for x86_64 or aarch64, for example with yay -S jayjay-appimage. The custom pacman repo has been retired; remove the entire [jayjay] section from /etc/pacman.conf before upgrading through AUR. To try an AppImage beta, remove the installed package first, then run the Linux installer with --beta. The guide has the steps.
Linux and Windows use the GPUI shell and share the Rust core with macOS. Linux ships as an AppImage, Debian/Ubuntu package, and AUR package for x86_64 and aarch64; see the guide. Windows support is in beta. Install Windows x64 from the Microsoft Store, or use the portable ZIP from GitHub Releases for beta builds. Windows requires Windows 10 version 1903 or later, or Windows 11, with jj installed separately. The Store manages its updates; the portable ZIP has no automatic updater.
Yes, in the macOS app and on Linux. Choose File > Open Remote Repository…, pick a host from your SSH config, and browse to the repository. macOS, Linux, and Windows hosts are supported; on first connect JayJay installs a small helper on the host, and the host must accept key or agent authentication. Review notes stay on your machine. The guide has the details.