Best Self-Hosted Grammarly Alternatives in 2026
Grammarly is an AI writing assistant that checks grammar, spelling, tone, and clarity in real-time across applications.
2 Self-Hosted Alternatives to Grammarly
LanguageTool
14KLanguageTool is a self-hosted office & productivity tool with support for grammar, natural language, natural language processing.
Harper
10KHarper is a Rust-based application that provides grammar checker that analyzes your writing quickly while keeping your data completely private.
Why Look for Grammarly Alternatives?
Grammarly is an AI writing assistant that checks grammar, spelling, tone, and clarity in real-time across applications.
Pricing
Here’s what Grammarly charges for its plans:
Free --- Free
Pro --- $12/month
Self-hosted alternatives eliminate these recurring costs entirely. You pay only for your own infrastructure.
2 Best Open-Source Alternatives to Grammarly
LanguageTool
Proofread more than 20 languages. It finds many errors that a simple spell checker cannot detect — 14,170 GitHub stars. Licensed under LGPL-2.1.
Harper
Open source grammar checker that analyzes your writing quickly while keeping your data completely private and secure on your device. — 10,085 GitHub stars. Licensed under Apache-2.0.
Why Self-Host Instead of Grammarly?
- Data ownership. Your data stays on your server, not on Grammarly’s infrastructure.
- Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
- No vendor lock-in. Export and migrate your data anytime. You control the database.
- GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.
Why teams switch from Grammarly
- → Data ownership. Your data stays on your server -- not on Grammarly's infrastructure.
- → Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
- → No vendor lock-in. Export and migrate your data anytime. You control the database.
- → GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.
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