Grammarly

Promptfree, for everyone, and the only version there is

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Build me a writing checker for my own drafts. The model is rented; the integration is the work.

STACK
- Node CLI plus a small local server, with an editor extension for the one editor I use
- LanguageTool locally for grammar; an LLM API only for tone, called explicitly

TWO KINDS OF CHECK, KEPT SEPARATE
- Deterministic rules: LanguageTool, plus a custom rule file for house style — banned words, preferred spellings, passive voice flags
- Judgement: a model call for clarity and tone, triggered on demand and never automatically

THE HOUSE STYLE FILE
- One YAML file of rules: pattern, message, severity, suggested replacement
- Checked into the repository beside the writing, so a team shares one definition
- The README should say that this file, not the model, is where quality actually comes from

INTEGRATION
- A local HTTP endpoint taking text, returning ranges with messages
- An editor extension underlining ranges and offering replacements
- Everything runs locally except the explicit tone call, and that call is logged

PRIVACY
- Nothing is sent anywhere by default; sending requires a keystroke and shows what will be sent
- Never send more than the selected paragraph

BATCH MODE
- Run over a folder of Markdown, output a report grouped by rule with counts, for cleaning up an archive

Include a README on adding a rule, the false-positive rate you measured, and the cost per thousand tone checks.