STACK Storage is a free application available for iPhone users that allows for secure and easy online file storage. Developed by TransIP BV, the program ensures that your files are safely stored on their servers in the Netherlands, protected by 256-bit encryption that guarantees that no one else can access your data.

With STACK Storage, you can easily upload, view, and share files with your friends and family. The program also offers instant upload, which automatically uploads new photos and videos to ensure that you always have the latest backup.

In addition, STACK Storage provides two-factor authentication, SFTP and WebDAV support, and password protection within the app. You can access your files from anywhere, and the program promises to respond to all your questions within an hour.

STACK Storage is a great option for anyone looking for secure, easy-to-use, and reliable online file storage.