Safe Apps allow users to interact with Ethereum applications straight from the Gnosis Safe interface. Users are able to customize their own interface by selecting from a list of apps. If an app is not listed in the UI by default, it’s possible to add a custom app by simply putting in the link to that app. Once apps are added, interacting with them will feel like executing any other multisig transaction. If your Safe has multiple signatures required to execute a transaction, those same requirements apply to Safe Apps.
Learn more about Safe Apps in our announcement post.