GrammarJo — Powered by JoJo von Rasoul

GrammarJo is a lightweight writing assistant extension for Firefox and Chrome.
Select text in an input/textarea or editable field, click GrammarJo, and instantly get an improved version you can accept and replace.
Key capabilities:
Grammar correction and tone rewriting modes (Friendly, Formal, Concise, Confident, Casual, and more)
Works with multiple providers:
Anthropic API
Local Ollama (including Docker setups)
OpenAI-compatible servers (for example LM Studio, Jan, or self-hosted endpoints)
In-context editing flow with regenerate and quick replace
Keyboard-friendly mode switching and navigation
Provider settings panel with local storage of your configuration
Privacy approach:
No GrammarJo backend
No account required
No analytics/telemetry by default
Your selected text is sent only to the provider endpoint you configure (cloud or local)