harper

Harper LS extension for the Zed editor

Grammar checking that respects your privacy. Real-time spelling and style suggestions across all macOS apps, running entirely on-device.

Grammarly for your terminal — underlines typos in Claude Code, Codex, Aider & any other terminal app

Documentation for Harper

local grammar checker built with harper.js

Identity, memory, and soul for AI agents. Runs standalone or as part of a TPS office.

Minimal Python FFI for the `harper-core` Grammar Checker library

Local-first spell checker powered by on-device LLMs.

Convert dictionaries into curated Harper Weirpacks, in the browser or from the command line.

One product-catalog app built twice — on Harper (co-located data + compute + messaging) and the Vercel stack (Functions + Neon + Upstash + Ably) — tested across eight scenarios from two U.S. coasts. A reproducible, open-model performance benchmark.

Syntax highlighter for VS Code for the curated dictionary of the Harper grammar checker

Tree-sitter grammar for the curated dictionary of the Harper grammar checker

Harper is an IDE plugin that integrates the Harper Language Server Protocol (LSP) support into JetBrains IDEs.

[wip] Local writing assistant across Android, Desktop and Web.

Batch-add harper spelling diagnostics to your dictionary

A Harper plugin for OAuth 2.0 and OpenID Connect authentication with multi-provider support.

Fork of Automattic/harper — offline, privacy-first Rust grammar checker with LSP, browser & IDE integrations. I contribute upstream.

Offline-first, LanguageTool-compatible grammar checking server — Go, single binary, backed by harper. Self-contained, rule-based, no AI/cloud dependencies.

Extensible language checker utility supporting pluggable backend providers and custom checking plugins over wasm.