# Callsheet Pro for developers

> Callsheet Pro turns film and TV call sheets into a mobile-friendly app for crew. For film & TV crew. The call sheet, finally usable.

## Developer API

- [Developer docs, plain text](https://developer.callsheetpro.app/developers.md): push call sheet days into a Callsheet Pro account via REST (POST /v1/days). Structured JSON or free-text input, upsert by externalId. Every Callsheet Pro user makes their own API key in the app: Settings, API key, Create API key. Keys are shown once and hashed at rest.
- [Developer site](https://developer.callsheetpro.app): the same, with a one-minute curl test, an iOS Shortcut walkthrough, limits and the error table.