# DayPilot > DayPilot is a task planner that schedules a person's tasks into their calendar, re-plans when the day changes, and moves up work they keep missing. It has a public HTTP API for scripts, servers and AI agents. ## Developer docs - [DayPilot API guide (Markdown)](https://daypilot.app/developer.md): how to authenticate with an API key, the conventions, errors and limits, the common calls with examples, and every endpoint. - [OpenAPI description](https://daypilot.app/openapi/v1.json): every endpoint with request and response schemas. - [Developer page](https://daypilot.app/Developer): the same guide as a web page. ## Product - [Home](https://daypilot.app/): what DayPilot does. - [Pricing](https://daypilot.app/Pricing): plans and what each includes.