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

Local-first Grammarly-style writing assistant for macOS. Harper engine, Accessibility overlays, AI tools through publik API.

local grammar checker built with harper.js

Documentation for Harper

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

Fast, offline, privacy-first typing assistant, autocomplete, and grammar checker for Windows

An optional AI second pass for Harper: catches what grammar rules can't, rewrites on request. Local models or Gemini. VS Code, Chrome/Firefox, LSP, Obsidian.

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.

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.

Python bindings for Harper, the fast offline English grammar checker written in Rust — no Java, no server

[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.