---
title: "C SDK Documentation"
canonical_url: https://developer.repebble.com/docs/c/
last_updated: 2026-10-11
sdk_version: 4.33.1
---
# C SDK Documentation

Source: https://developer.repebble.com/docs/c/

This is the contents page for the [Pebble C SDK](https://developer.repebble.com/sdk.md). Here you will find information on all the available modules, functions and objects that can be used to create watchapps and watchfaces for Pebble.

The C SDK is broken down into these 5 top level modules. Click on them to browse around the rest of the SDK.

You can also use the search bar at the top of the page to find what you are looking for.

#### [Foundation](https://developer.repebble.com/docs/c/Foundation.md)

The core of the Pebble SDK.

#### [Graphics](https://developer.repebble.com/docs/c/Graphics.md)

Low-level drawing routines.

#### [User Interface](https://developer.repebble.com/docs/c/User_Interface.md)

Everything related to user interface.

#### [Worker](https://developer.repebble.com/docs/c/Worker.md)

Run a background worker alongside the foreground app to collect data or respond to events while the app is not running. See the [Background Worker](https://developer.repebble.com/guides/events-and-services/background-worker.md) guide.

#### [Standard C](https://developer.repebble.com/docs/c/Standard_C.md)