# ScriptGrain makes Meta Muse better at being you · ScriptGrain

> Connect ScriptGrain to Meta Muse: a measured 45-attribute profile of your voice, a score on every draft, and a polish toward the target. Meta Muse keeps doing what it does; it just sounds like you.

Canonical: https://scriptgrain.com/us/works-with/muse

# ScriptGrain makes Meta Muse better at being you

*By Jack Stovell · published 2026-09-20*

Meta Muse can write for you. It cannot measure you. ScriptGrain measures your voice as 45 attributes from writing you have already published, connects to Meta Muse, and scores every draft against the measurement, so the assistant you already use writes as you rather than as its average.

**Start with the prompt builder below**: paste your writing and get a system prompt written in measured numbers, ready for custom instructions or a project. The connector does the same with the full profile.

## How to connect

Works with Meta Muse (meta.ai, US).

1. **Measure your voice.** Create a free ScriptGrain account and paste three or more pieces you wrote (3,000 words works best). The profile takes a few minutes and costs nothing.
2. **Connect.** Ask Muse to build a custom integration to ScriptGrain with the MCP server URL `https://mcp.scriptgrain.com/mcp`. Muse asks for credentials: mint an API key at Settings, then API, and enter it in Muse's secure credential store. Once ScriptGrain is listed in the Muse connector directory, connecting is a sign-in on the consent page instead.
3. **Write, then score.** Muse holds the connection across conversations, so "write this in my voice" works without re-explaining who you are, and "is this on voice?" scores any text you paste.

## What changes

Without a profile, Meta Muse writes from a description: whatever you can say about your own style. Most of a voice is what you cannot say: contraction rate, clause ordering, how often you open with a question, the words you reach for without noticing. With ScriptGrain connected, Meta Muse writes from the measured profile and every draft comes back with a voice-match score and the exact features that moved. On-voice drafts score 0.85 to 0.95; a clearly different voice scores under 0.45. Paste any two pieces into the free off-voice check to see the same measurement with no account.

## What stays free

The profile, the connector, scoring any text against your profile, and comparing pieces with no profile at all are free on every plan. Generating drafts in your voice, polishing toward a target and the monthly voice monitor are paid.

## Questions

### Do I need a paid plan to connect ScriptGrain to Meta Muse?

No. The connector, the profile and voice-match scoring are on the Free plan. Paid plans add generation credits, polishing and the monthly voice monitor.

### Does Meta Muse send my conversations to ScriptGrain?

No. Meta Muse calls ScriptGrain only when it uses a tool (score this text, generate this brief), and ScriptGrain receives only what that call contains. Your API key or sign-in token never appears in the conversation.

### What is the voice-match score measuring?

Stylistic alignment: sentence rhythm, punctuation habits, pronoun mix, formality, argument structure and the rest of the measured attributes, compared feature by feature against your profile. It says whether the draft sounds like you, not whether it is any good.

## Related

- [AI writing API and MCP server](https://scriptgrain.com/us/ai-writing-api-and-mcp-server)
- [Free off-voice check](https://scriptgrain.com/us/tools/brand-voice-consistency-checker)
- [Make ChatGPT better at being you](https://scriptgrain.com/us/make-chatgpt-sound-like-you)