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Offline, privacy-first grammar checker. Fast, open-source, Rust-powered
This repository page is useful for visitors, but Git-Stars keeps it out of search indexing until more original evidence and comparison context are available.
70
review score
Problem solved
Harper solves the problems of expensive, privacy-invasive grammar checkers like Grammarly that send data to servers, and resource-heavy tools like LanguageTool that require gigabytes of RAM and large downloads. It provides a fast, private, and lightweight alternative.
Deployment reality
The available setup signal starts with: cargo install harper-ls. Treat this as a starting point, then ask Codex or Claude to inspect the README, environment variables, runtime version, and deployment target before production use.
Commercial use
The recorded license is Apache-2.0. This is a useful commercial-use signal, but teams should still verify license text, dependencies, model/API terms, and trademark constraints.
Capability ceiling
Automattic/harper still needs a clearer capability analysis. Use the metadata as a discovery signal, not as a production recommendation.
Git-Stars is independent and not affiliated with GitHub or this project. Analysis may be AI-assisted and based on public repository metadata plus short README-derived summaries. We do not mirror full README files, docs, issues, or social comments.
Automattic/harper is tracked as a Rust project in the UI Framework area. This evaluation combines public GitHub metadata, category signals, short source summaries, and Git-Stars editorial rules rather than copying project documentation.
Momentum check: the repository has 14k total stars, with +0 today, +2.0k this week, and +0 this month. These growth windows help distinguish durable adoption from short-lived visibility spikes.
Maintenance check: current activity is Active; the latest push was 23 days ago, and the open issue queue is 702, about 5.02% of total stars. Treat this as an adoption signal, not a substitute for engineering due diligence.
Adoption check: 539 forks and 14k watchers suggest how often the project is reused or followed. License signal: Apache-2.0. Always verify license compatibility before commercial or internal use.
Practical fit: this project is most relevant when you need developer workflow automation and command-line tooling. Be cautious when you have low tolerance for large unresolved issue queues.
Source check: Git-Stars currently has 2 explicit source reference(s) for this report and a recent growth signal of 2.0k. Follow the original GitHub repository for final install, security, and release information.
Analysis
LimitedNeeds stronger original analysis before indexing.
Sources
ReadyRepository metadata and README/source references are attached.
License
ReadyApache-2.0 is recorded for review.
Maintenance
ReadyRecent activity is visible in repository metadata.
Alternatives
ReadyEnough nearby projects exist for comparison.
Momentum
14k Stars
Reuse
539 Forks
Attention
14k Watchers
Maintenance
active
License
Apache-2.0
Open issues
702
Harper is a fast, private, and lightweight English grammar checker designed to be a better alternative to Grammarly and LanguageTool. It runs entirely locally, taking milliseconds to lint documents with a minimal memory footprint, and is even available via WebAssembly.
Key Features
- Completely private: all processing is done locally, no data sent to servers. - Extremely fast: lints documents in milliseconds. - Lightweight: uses less than 1/50th of LanguageTool's memory footprint and runs via WebAssembly.
UI Framework
Frontend frameworks, design systems, and interface libraries
cargo install harper-ls80
Health Score
Active
Commit Activity
Oct 22, 2023
Created
Jul 30, 2026
Last push
+576
Today's growth
+1.7k
7-day growth
+1.7k
30-day growth
Forks
Open
Watchers
Automattic
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License
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Forked
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Maintained