# Harper Grammar checker for developers. Source: [Console review]() Website: [https://writewithharper.com/]() Profile updated: 2026-10-16 Category: [Local development]() ## Supported tech stack Research checked: 2026-10-11 ### Runs on - Browser (Runtime) - macOS (Operating system) ### SDK support - JavaScript (Language) - Rust (Language) Source: [Research source]() Documented compatibility; coverage may be incomplete. Written in describes implementation, not user-project language support. Harper is available as a JavaScript library, Rust crate, browser extension and macOS system-wide tool. ## Console’s review — 2024-10-03 Reviewed: 2024-10-03 Author: [David Mytton]() Citation: [This review]() ### What we like Like Grammarly, but local. Available as a language server for IDE integration. Also available as an Obsidian or Zed plugin. Low-latency linting with minimal memory usage. WebAssembly build also available for embedding into apps. Customizable dictionary with config. ### Tradeoffs No easily accessible quick start guide - you need to delve into the GitHub repo to find the instructions. This review reflects Console’s assessment at publication on 2024-10-03. Features and limitations may have changed since the review date. ## Is Harper a fit? Based on [Console’s review published on 2024-10-03](). Summary updated: 2026-10-16 ### Who it’s for Developers should consider Harper ### Why consider it Harper provides low-latency linting with minimal memory usage ### Keep in mind Harper lacks an easily accessible quick start guide [Selection criteria]() · [About Console]() · [Browse tools]()