Harper vs Outwrite

Harper is a free, open-source grammar checker that flags capitalization, spelling, awkward phrasing, and grammar errors. The maker says checks run locally, with no cloud round-trips, telemetry, or LLM in the loop, and that suggestions appear in under 10 ms. Harper is available through browser and editor extensions, a language server, a JavaScript library, a Rust crate, and native apps. Listed integrations include Chrome, Brave, Edge, Firefox, VS Code, Cursor, Obsidian, WordPress, Neovim, Zed, Helix, Emacs, and Sublime Text. Its language support covers English and British, American, Canadian, Australian, and Indian English dialects. Harper Desktop lets users toggle rules, add dictionary entries, select a dialect, and turn checking on or off per app. The desktop app is labeled beta for macOS 14 or later, and the Windows desktop app is also described as a beta; its binary was not signed at the time of the listed post. Harper is free, with no account or credit card required.

Outwrite is an AI writing assistant for improving spelling, grammar, style, and sentence structure. Its Rewrite feature offers alternative sentence wording, while real-time statistics report readability and grade level. Style suggestions and tone detection are listed, and support covers seven languages: English variants for the US, UK, Australia, New Zealand, and South Africa, plus French and Spanish. Outwrite works as a web app and browser extension, and its listed online integrations include Google Docs, Microsoft Word, Outlook, Gmail, LinkedIn, and WordPress. It has no desktop or mobile app. The free plan includes spelling and grammar, thesaurus, Google Docs, Microsoft Word, browser extensions, and the web app. Pro costs $9.95 a month and adds style and structural suggestions, rewriting, 50 monthly plagiarism checks, and priority email support. Teams costs $7.95 a month per user, with 50 checks, team access management, consolidated billing, and a group discount. Teams accounts are for groups of three or more.