# FitSignal

> FitSignal measures product-market fit for SaaS teams using the Sean Ellis /
> Superhuman methodology: the "how disappointed would you be?" survey, the 40%
> very-disappointed benchmark, persona segmentation, word-cloud analysis and
> AI-ranked improvement themes. It also runs licensed NPS® surveys. Developers
> get an embeddable widget, a typed JavaScript SDK, a REST API, signed
> webhooks, and a hosted MCP (Model Context Protocol) server.

FitSignal is built API-first. Everything in the dashboard is available over
the REST v1 API and, for AI agents, through the hosted MCP server at
https://www.fitsignal.com/api/mcp (Streamable HTTP, API-key auth).

## Product

- [Product overview](https://www.fitsignal.com/features): the full measurement loop
- [PMF Score Dashboard](https://www.fitsignal.com/features/pmf-score): score, trend and confidence against the 40% benchmark
- [AI Improvement Analysis](https://www.fitsignal.com/features/ai-analysis): feedback themes ranked by impact
- [The PMF method](https://www.fitsignal.com/guide): the Sean Ellis question and the 40% benchmark, explained
- [NPS surveys](https://www.fitsignal.com/nps): licensed Net Promoter® methodology
- [Pricing](https://www.fitsignal.com/pricing): free plan with 250 responses a month

## Developers

- [Developer hub](https://www.fitsignal.com/developers): widget, JavaScript SDK, REST API, MCP server, webhooks, Slack
- [MCP server setup](https://www.fitsignal.com/docs/mcp): connect Claude, Cursor or VS Code to FitSignal PMF data
- [Widget SDK docs](https://www.fitsignal.com/docs): embed PMF and NPS surveys in-app
- [API reference](https://www.fitsignal.com/docs/api-reference)

## Optional

- [Why FitSignal](https://www.fitsignal.com/why-fitsignal)
- [Blog](https://www.fitsignal.com/blog)
- [Help center](https://www.fitsignal.com/help)