Open Source Grammarly Alternatives
A curated collection of the 2 best open source alternatives to Grammarly.
The best open source alternative to Grammarly is LanguageTool. If that doesn't suit you, we've compiled a ranked list of other open source Grammarly alternatives to help you find a suitable replacement. Other interesting open source alternative to Grammarly is Harper.
Grammarly alternatives are mainly Productivity & Utilities but may also be Browser Extensions. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Grammarly.
Written by Piotr Kulpinski
Check grammar, punctuation, and spelling errors instantly with AI-powered technology. Supports 30+ languages with browser extensions and desktop apps.
Advanced AI-powered grammar checking that goes beyond basic spell check to provide comprehensive writing assistance across 30+ languages and dialects. Trusted by over 2000 organizations including BMW Group, European Union, and JetBrains.
Key features include:
- Real-time grammar and punctuation correction with intelligent suggestions
- Multi-language support with automatic language detection
- Style and tone improvements to enhance writing quality
- Paraphrasing tool powered by artificial intelligence
- Browser extensions for Chrome, Firefox, Safari, Edge, and Opera
- Desktop applications for Windows and macOS
- Office integrations for Microsoft Word, LibreOffice, and Google Docs
The platform offers both free and premium versions, with the free tier handling basic grammar and spelling errors, while premium provides advanced style suggestions, punctuation refinement, and enhanced error detection. Privacy-focused design ensures no text is stored by browser extensions.
Perfect for students, professionals, and organizations requiring error-free, polished writing across multiple languages and platforms.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Open source grammar checker that analyzes your writing quickly while keeping your data completely private and secure on your device.
Harper offers a refreshing approach to grammar checking by putting privacy first while delivering fast, accurate results. Unlike cloud-based alternatives that send your text to remote servers, Harper processes everything locally on your device, ensuring your sensitive documents, personal writing, and confidential information never leave your computer.
This open source solution provides comprehensive grammar and style checking without the subscription fees or data collection concerns of traditional tools. The lightweight design means you get instant feedback on your writing without the delays common with online checkers.
Key advantages include:
- Complete privacy protection - all processing happens locally
- Lightning-fast analysis with no internet dependency
- Zero cost - completely free to use and modify
- Transparent code - open source means no hidden functionality
- Cross-platform compatibility for various operating systems
- Offline functionality - works anywhere, anytime
Whether you're drafting emails, writing reports, or crafting creative content, Harper gives you professional-grade grammar checking while maintaining complete control over your data. Perfect for writers, students, professionals, and anyone who values both quality writing assistance and digital privacy.
OpenAlternative AdsPeople are looking for alternatives to...
CodeRabbit – The leading AI Code Review platform. Ship better quality code in 50% less time, with 90% fewer bugs.
