Can I vibe code LanguageTool?
Grammar and style checker for 30+ languages.
Two honest paths make this a yes. The pragmatic one: LanguageTool's core engine is open source — self-host it in Docker and point a thin UI at it, done in an evening. The modern one: an LLM pass catches grammar, style, and clarity issues with explanations the rules engine can't match. Either way, a personal proofreader with your own style preferences is a one-sitting build; the paid tier sells integrations, not intelligence.
Build a personal proofreader. Back end: run the open-source LanguageTool server in Docker (document the compose file), plus an optional LLM pass for style and clarity suggestions beyond grammar rules. Front end: a clean editor where issues underline as I type (debounced checks), a right panel listing each issue with explanation and one-click apply, and a personal dictionary stored in Postgres. Let me define custom style rules in a rules.md the LLM pass reads (e.g. 'never use utilize'). Next.js, deployable with the checker on a small VPS.
A proofreading page that runs your text through the open-source LanguageTool server (or an LLM prompt) and lists issues with one-click fixes.
- Deep integrations: Google Docs, Word, email clients, every browser
- As-you-type checking everywhere you write
- Their personal dictionary synced across devices
- Team style-guide enforcement on business tiers
The value is ambient presence in every text field you ever touch — recreating the everywhere-ness, not the checking, is the real work.
A prompt is the first move, not the whole game. Course 01 teaches you to take a prompt like this one to a shipped, working app — reviewing, correcting, and steering the agent the whole way.
Start Course 01 →