Source: https://seerepo.com/compare/Automattic/harper/vs/janhq/jan
Markdown source: https://seerepo.com/compare/Automattic/harper/vs/janhq/jan.md
Description: harper and jan share 10 technologies: Tokio, Tauri, @tauri-apps/api, objc2-app-kit, objc2-foundation, PostHog, React, pulldown-cmark, zip, and Tailwind CSS. Both are written in Rust.

# harper vs jan

harper and jan share 10 technologies: Tokio, Tauri, @tauri-apps/api, objc2-app-kit, objc2-foundation, PostHog, React, pulldown-cmark, zip, and Tailwind CSS. Both are written in Rust.

- [Automattic/harper](https://seerepo.com/r/Automattic/harper): Offline, privacy-first grammar checker. Fast, open-source, Rust-powered
- [janhq/jan](https://seerepo.com/r/janhq/jan): Jan is an open source alternative to ChatGPT that runs 100% offline on your computer.

## What they share and what sets them apart

- In common: Tokio, Tauri, @tauri-apps/api, objc2-app-kit, objc2-foundation, PostHog, React, pulldown-cmark, zip, Tailwind CSS
- Only in harper: cached, lru, SvelteKit, Svelte, egui, lru-cache, ammonia, Fastlane, tracing, tracing-subscriber, tracing-wasm, winit, core-graphics, egui-wgpu, egui-winit, uiautomation, @fortawesome/free-solid-svg-icons, quill, marked, Font Awesome, CodeMirror, @docsearch/css, Chart.js, @docsearch/js, brace, typed.js, Drizzle, drizzle-zod
- Only in jan: Hummingbird, sqlx-sqlite, tauri-plugin-store, SQLite, sqlx, gio, glib, rusqlite, Vite, TanStack, @tauri-apps/plugin-store, OpenAI, comfy-table, indicatif, tauri-plugin-dialog, Ratatui, console, gtk, rfd, ed25519-dalek, hmac, keyring, oauth2, rmcp, agent-client-protocol, opencv-python, png, schemars, log, env_logger, psutil, tauri-plugin-log, cairo-rs, objc2-web-kit, webkit2gtk, webview2-com, ash, calamine, csv, html2text, infer, pdf-extract, quick-xml, class-variance-authority, tailwind-merge, sonner, Radix UI, motion, @streamdown/code, @tanstack/react-virtual, dnd-kit, emoji-picker-react, Framer, react-textarea-autosize, use-stick-to-bottom, vaul, Lucide, @tabler/icons-react, ai, ai-sdk, streamdown, react-markdown, shiki, unist-util-visit, katex, rehype-katex, remark-gfm, remark-math, Zod, tauri-apps

## Side by side

| | harper | jan |
|---|---|---|
| Size | 180,779 lines written, 944 code files | 478,180 lines written, 949 code files |
| Who writes it | 0.5% of its commits signed by AI. With Claude Code and Mistral Vibe | 0.5% of its commits signed by AI. With GitHub Copilot, Claude Code, Cursor, Factory, Jules, and Aider |
| Activity | Last push November 6, 2026, 4,193 commits, 17,449 stars | Last push November 5, 2026, 7,455 commits, 45,500 stars |
| Tests | 112 test files. 1.6% of its code files have a test that imports them | 527 test files. 48.9% 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, harper or jan?

jan, with 478,180 lines written; harper has 180,779.

The proof: [janhq/jan's code at commit 879e6ae](https://github.com/janhq/jan/tree/879e6ae9cca4a38673fdb4093349a327e17ccbb1)

### Which has more GitHub stars, harper or jan?

jan, with 45,500 stars; harper has 17,449.

The proof: [janhq/jan on GitHub](https://github.com/janhq/jan)

### Which has more tests, harper or jan?

jan, with 527 test files; harper has 112.

The proof: [janhq/jan's code at commit 879e6ae](https://github.com/janhq/jan/tree/879e6ae9cca4a38673fdb4093349a327e17ccbb1)

### Which was updated more recently, harper or jan?

harper: its last push was on November 6, 2026, and jan's on November 5, 2026.

The proof: [Automattic/harper's commits on GitHub](https://github.com/Automattic/harper/commits)

### Which has more commits signed by AI, harper or jan?

In both, an AI signed 0.5% of their commits.

The proof: [the commits each tool signed in Automattic/harper](https://seerepo.com/r/Automattic/harper/ai)

## Sources

- Automattic/harper: Read on November 6, 2026, at commit d52aeac (https://github.com/Automattic/harper/tree/d52aeac0a6de1cdb030b231705ab7e7e4e12e197)
- janhq/jan: Read on November 6, 2026, at commit 879e6ae (https://github.com/janhq/jan/tree/879e6ae9cca4a38673fdb4093349a327e17ccbb1)

## 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.