Is harper still maintained?

Yes, active. Last change today. Latest release v3.1.0, yesterday.

Widely used. 17k stars, 3 years old, by an organization. As with any download, get it from the official repo.

How to install on Windows

Automattic/harper

Offline, privacy-first grammar checker. Fast, open-source, Rust-powered

Node.jsRustRuby#chrome-extension#developer-tools#english-language#grammar-checker

Difficulty: Moderate
Time: 30 min or more
Stars: ★ 17,471
Activity: Updated this month

Before you start

Is it free?: YesOpen source (Apache-2.0).
Still maintained?: Yes, activeLast change today. Latest release v3.1.0, yesterday.
Can I trust it?: Widely used17k stars, 3 years old, by an organization. As with any download, get it from the official repo.

Saved setup from 9 h ago

Will it work on Windows?

Yes, it installs on your Windows

A ready-made Windows download is in the latest release.

Your system

macOS Windows Linux

Start here

Website ↗writewithharper.comThe project's own site.

Also: Docs ↗

Heads-upBuilding it yourself? It also needs MariaDB.

Download for Windows

v3.1.0 · 11/6/2026 ↗

Harper_3.1.0_x64-setup.exe

exe · x64 · 20.0 MB · 44 downloads · best match

Download

Runs the installer.

Invoke-WebRequest "https://github.com/Automattic/harper/releases/download/v3.1.0/Harper_3.1.0_x64-setup.exe" -OutFile "Harper_3.1.0_x64-setup.exe"
Start-Process ".\Harper_3.1.0_x64-setup.exe"

Other Windows downloads (2)

harper-cli-x86_64-pc-windows-msvc.zip

zip · x64 · 12.6 MB · 81 downloads

Download

Add the extracted folder to your PATH if it's a CLI tool.

Invoke-WebRequest "https://github.com/Automattic/harper/releases/download/v3.1.0/harper-cli-x86_64-pc-windows-msvc.zip" -OutFile "harper-cli-x86_64-pc-windows-msvc.zip"
Expand-Archive "harper-cli-x86_64-pc-windows-msvc.zip" -DestinationPath .

harper-ls-x86_64-pc-windows-msvc.zip

zip · x64 · 13.7 MB · 162 downloads

Download

Add the extracted folder to your PATH if it's a CLI tool.

Invoke-WebRequest "https://github.com/Automattic/harper/releases/download/v3.1.0/harper-ls-x86_64-pc-windows-msvc.zip" -OutFile "harper-ls-x86_64-pc-windows-msvc.zip"
Expand-Archive "harper-ls-x86_64-pc-windows-msvc.zip" -DestinationPath .

Did you get it running?

No reports for Windows yet.

Still stuck? Ask an AI

Opens a chat with this manual already filled in, for Windows. It uses your own account; gitmanual sends nothing.

Ask Claude Ask ChatGPT

Parts list

1×Node.js 24.15.0runtime
1×Rust stableruntime
1×Ruby 3.4.9runtime
1×pnpm pnpm@10.10.0package manager
1×bundler package manager
1×MariaDB service

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Is this your repo?

Add a badge to your README so newcomers find these steps.

[![Setup manual](https://gitmanual.com/Automattic/harper/badge.svg)](https://gitmanual.com/Automattic/harper)

Good to know

Monorepo (workspaces) — install from the repo root.
Cargo workspace — pick a crate with cargo run -p <name>.
Dockerfile available (base image: rust:latest).
justfile found — run just --list to see available tasks.
Has AGENTS.md — instructions for coding agents. You can open Claude Code (or another agent) in the cloned folder and ask it to do the setup for you.
Nested projects: fuzz/Cargo.toml, harper-asciidoc/Cargo.toml, harper-brill/Cargo.toml, harper-cli/Cargo.toml and 11 more

Details

License: Apache-2.0
Open issues: 1,053
Branch: master

package.json scripts (3)

check-dependency-version-consistencycheck-dependency-version-consistency
checkbiome check --diagnostic-level=error
formatbiome check --write .

Files we read (19)

.github/workflows/binaries.yml

.github/workflows/build_web.yml

.github/workflows/chrome_plugin.yml

.github/workflows/desktop_windows.yml

.github/workflows/just_checks.yml

.github/workflows/stale.yml

.node-version

.nvmrc

.ruby-version

CONTRIBUTING.md

Cargo.toml

Dockerfile

Gemfile

README.md

docker-compose.yml

justfile

package.json

pnpm-workspace.yaml

rust-toolchain.toml

1,995 files in the repo

Reading the repo

Opening the box…

Invoke-WebRequest "https://github.com/Automattic/harper/releases/download/v3.1.0/harper-cli-x86_64-pc-windows-msvc.zip" -OutFile "harper-cli-x86_64-pc-windows-msvc.zip" Expand-Archive "harper-cli-x86_64-pc-windows-msvc.zip" -DestinationPath .

Invoke-WebRequest "https://github.com/Automattic/harper/releases/download/v3.1.0/harper-ls-x86_64-pc-windows-msvc.zip" -OutFile "harper-ls-x86_64-pc-windows-msvc.zip" Expand-Archive "harper-ls-x86_64-pc-windows-msvc.zip" -DestinationPath .