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.

Documentation for Harper

local grammar checker built with harper.js

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

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

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

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

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

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.

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

Grafana datasource plugin for Harper

Harper backend

Data pipeline for ingesting BigQuery datasets into Harper for real-time edge processing.

MQTT broker interoperability plugin for Harper — enables standard MQTT clients to connect to Harper.

Application scaffolding template for Harper-based projects with recommended structure and patterns.

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

Local writing assistant across Android, Desktop and Web.

Lightweight HTML scratchpad for grammar checking text copied from apps without Harper support (BBEdit, Things, Day One, Mail, etc.). Works with Harper's Chrome/Firefox extension. ~10x less memory than Harper's homepage. Offline, private, plain text only, disposable. Copy → paste → check → fix → copy back.