# ⚙️ Extensions
Extensions are made of Apps & Widgets. They allow developers to create custom integrations for their projects using a preset of tools provided by PeerMe.
Apps appear in the app gallery during the proposal creation process.
Their main purpose is to provide a simple user interface for the proposer to construct smart contract calls on the blockchain but are not limited to it.
Learn more about creating an App in the PeerMe Extensions GitHub Repository (opens new window).