ScriptGrain

Write like yourself, at scale.

Upload your writing. ScriptGrain analyses 45 measured reference points across your style and builds a voice profile that generates content that reads like you wrote it.

Paste 120 words on the homepage for an instant preview of six signals (sentence rhythm, syntax, punctuation, lexicon, rhetoric, cadence), measured in your browser with nothing uploaded. The free account then runs the complete 45-point profile on the same sample.

ScriptGrain makes ChatGPT, Claude and the rest better at being you: it works inside the AI you already use. The profile connects to ChatGPT, Claude, Meta Muse and any MCP client, so the assistant writes from the measured voice and every draft is scored against it. See how it works with ChatGPT and with Claude.

What ScriptGrain does, in four steps

  1. Add writing you have already done: paste it, upload files, or import from a URL. One piece is enough to start; 3,000+ words across several samples works best.
  2. Get measured: a two-pass analysis reads each sample individually, then synthesises one voice profile covering 45 reference points, from vocabulary and sentence rhythm to punctuation habits and the words you reach for without noticing. About 45 seconds.
  3. Generate from briefs: describe what you need, and every draft is written under the profile's constraints, across sixteen content types.
  4. See the score: every draft returns a voice-match score measured against your profile, and a polish loop revises toward your voice when the score falls short.

What makes it different

ChatGPT custom instructions capture a handful of stated preferences. ScriptGrain measures what you actually do: contraction rate, parenthetical frequency, clause ordering, opening style, the words you unconsciously reach for, all from your real writing. On identical briefs, with the facts held fixed, the measured style of the draft moves to the profile. In the published test the average sentence fell from about 17 words to about 11, sentences under eight words doubled from 24% to 48%, contractions rose by roughly 70%, and ten em dashes became none. That is a difference you can count, not a claim that the writing is better: read the full test and its method and limitations.

Plans

The Free plan includes one voice profile and one writing analysis, with no card required: see your own profile before paying anything.

Works with your AI tools

Every plan includes a public API and an MCP server at mcp.scriptgrain.com, so Claude and other AI assistants can build voice profiles, draft in your voice, and score drafts directly. Connection details: API documentation and MCP setup.

Privacy, billing and who is behind it

Not just generated. Measured.

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