---
title: "Pebble SDK 4.0-beta17 - Changelog"
canonical_url: https://developer.repebble.com/sdk/changelogs/4.0-beta17/
last_updated: 2025-02-25
sdk_version: 4.33.1
---
# Pebble SDK 4.0-beta17 - Changelog

Source: https://developer.repebble.com/sdk/changelogs/4.0-beta17/

_Release Date: August 16 2016_

This is a developer preview release of SDK 4.0. No firmware is provided.

### Changes to Firmware

- Added support for [running developer apps written in JavaScript](https://developer.repebble.com/blog/2016/08/15/introducing-rockyjs-watchfaces.md)

### Changes to SDK

- AppGlance icons must now be provided as references to `publishedMedia` in package.json. Providing plain resource IDs will not work.
- Custom timeline icons can now be created via `publishedMedia`.
- Added support initial for building JavaScript apps. These apps won't support aplite.

### Known Issues

- `publishedMedia` is completely undocumented. Updated documentation will be available soon. In the interim, continue using 4.0-dp3 to develop appglances.