Our products are built for privacy and security.
Client-side encryption: S4 only stores encrypted copies of your data. Because all of your data is encrypted before it leaves your device, we can never read or modify your files. The server operator that stores your data can’t spy on your files even if it tries. Learn more
File synchronization with Magic Folders: Magic Folders is a file-syncing utility that automatically keeps a folder’s contents up-to-date across multiple devices via S4. Learn more
Verifiable claims: All of our code is free and open source. Anyone can confirm security, the lack of backdoors and intentional or unintentional vulnerabilities through independent verification of open source code.
Simple setup: After downloading the Gridsync application, a short, pronounceable invite code is all you need to configure your device to connect to S4 and start uploading folders.
Simple Secure Storage Service (S4) is Least Authority's verifiably secure off-site backup system for individual use. Sign up to get a free 30-day trial, followed by just $25/month. S4 now includes Magic Folders for file synchronization. After signing up, you can use Gridsync or CLI to access your Simple Secure Storage Service (S4).Learn More Signup