USB Disk offers a free version with basic features that can be used without an in-app purchase. However, some advanced features require an active subscription. The subscription duration and price are displayed in the app's storefront. The following features are included in the subscription:
- Open and create zip files
- Adjust the audio mixer, use shuffle and repeat
- Access the device's photos library
- Protect the access to the app or specific files and folders with lock codes
- Access WebDAV and FTP servers. You can also configure SharePoint connections
- Edit simple text files. Also annotate PDF files
- Present files on external screens
The subscription cost will be charged to the user's Apple ID account upon confirmation of purchase. The subscription automatically renews unless canceled at least 24 hours before the end of the subscription period. Users can manage subscriptions and disable auto-renewal by going to their account settings on the App Store after purchase. Any unused portion of a free trial period is forfeited as soon as a subscription is purchased.