Harper, an Offline Grammarly Alternative
Harper is a blazing-fast, open-source grammar & spell checker that runs entirely on your device, covering US, UK, Canadian, Australian & Indian English—no data ever leaves your machine. Harper is the only grammar checker that doesn
Harper, an Offline Grammarly Alternative launched on November 4, 2024 with 14 votes, #1,069 of 4,990 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Harper is a grammar and writing tool that works offline, designed as an alternative to Grammarly. It launched in November 2024 and helps users improve their writing without requiring internet connectivity. The tool is for writers who want grammar checking and writing assistance while maintaining privacy or working without an active internet connection. Its key distinction is its offline-first approach, making it accessible in environments where cloud-based solutions may not be practical.
written from the facts on this page · September 2026
From the sources
Harper is a free, open-source grammar checker designed to be just right. Think of it as the private alternative to Grammarly, built after years of dealing with the shortcomings of the competition. Harper catches the kinds of mistakes that matter: improper capitalization, misspelled words, awkward phrasing, and broken grammar. Your writing never leaves your computer. Harper is available as a language server, a JavaScript library, a Rust crate, browser extensions, editor extensions, and native apps. Pick the integration that matches your workflow or build your own. Every check happens locally. No cloud round-trips, no telemetry, no LLM in the loop. That means certainty that we never train…from writewithharper.com
Does a similar job
all alternatives →
Grammarly for Chrome2014 · grammarly.com · ▲506Clear, effective, mistake-free writing everywhere you type.
Refine – A Local Alternative to Grammarly2025 · refine.sh · ▲408Fix grammar, rewrite sentences, translate text, and get clear explanations across your Mac apps. Do it all offline with local AI.
Free Grammar Checker by Perfect Tense2019 · perfecttense.com · ▲83Free AI-powered spelling, grammar, and punctuation checker
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