TL;DR
harper at a glance
Offline, privacy-first grammar checker. Fast, open-source, Rust-powered.
Overview
What is harper?
harper is an open-source project by harper on GitHub. Offline, privacy-first grammar checker. Fast, open-source, Rust-powered It has 15,313 stars on GitHub. Commonly categorised as HR. All credit belongs to the maintainers; One9Founders lists it for discovery with a link to the source.
Trust
Security assessment
FAQ
Frequently asked questions
What is harper and what does it do?
Offline, privacy-first grammar checker. Fast, open-source, Rust-powered.
What does harper cost in India?
harper is a paid tool.
Is harper safe for startups?
harper has not yet been assessed on our Security & Data Privacy criterion. Check the vendor’s own security documentation before using it for sensitive data.
How is harper rated on One9Founders?
harper has not yet been rated on our 10-point evaluation framework. See How We Rate for the 10-criterion framework and status definitions.
Community
Reviews & comments
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Listed: 12 September 2026
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