PRODUCTIVITY
CLOUD-READY
ACTIVELY MAINTAINED
FREE
HARPER
Harper is a premium, open-source grammar checker. It provides rapid writing analysis while maintaining complete data privacy and security on your device. Built with a robust tech stack, including natural language processing (NLP) and machine learning algorithms, Harper targets writers seeking accurate feedback and control over their content.
GITHUB STARS
10k
+12% this month
FORKS
326
Active community
LAST PUSH
Apr 24, 2026
High momentum
WATCHERS
24
Tracking updates
LICENSE
Apache-2.0
Commercial use
Harper is a premium, open-source grammar checker. It provides rapid writing analysis while maintaining complete data privacy and security on your device. Built with a robust tech stack, including natural language processing (NLP) and machine learning algorithms, Harper targets writers seeking accurate feedback and control over their content.
High Performance
Built for speed and minimal overhead.
Self-hostable
Docker, Kubernetes, or bare metal
Developer Native
Programmable via any language workflow
SUPPORTED LANGUAGES
VISUAL INTERFACE
The Quick Glance
Status
Active
Category
Productivity
Pricing
Free
Self-Hosted
No
Available on
Web
Latest Release
v2.0.0
Apr 8, 2026Relative Standing — across 1,284 tools
STARS10k
Top 33% globally
FORKS326
Top 58% in Open Source
ACTIVITYVery High
Top 6% Activity
WATCHERS24
Top 64% Community