Everything the Caliu apps do goes through the public REST API at https://api.caliuapp.com: notes, tags, reminders, attachments, search, sync, sharing, and export. Anything the apps can do, your code can too.
Interactive docs
Browse every endpoint, schema, and example request in the interactive reference:
- api.caliuapp.com/docs, served straight from the API
- caliuapp.com/docs, the same reference embedded on the Caliu website
Both let you explore request and response shapes and try calls from the browser. There is also a View API docs shortcut on the API Keys screen in the apps.
OpenAPI specification
The API is described by an OpenAPI 3.1 document, generated from the same code that serves the endpoints, so it never drifts from reality:
https://api.caliuapp.com/openapi.json
Feed it to code generators, API clients like Postman, or your own tooling.
Authentication
Most endpoints expect an API key sent as a Bearer token:
Authorization: Bearer caliu_your_key_here
See the API keys article for creating one. If you are building for AI agents, the MCP server article covers a higher-level integration.