ShieldSync keeps your files the same on every computer you own: straight across your Wi-Fi, or through an encrypted cloud that we can’t read. Free to start, with 5 GB of cloud included.
Every file is cut into small pieces at points chosen by what is inside it. Edit one paragraph and only the piece around it changes.
Each piece is encrypted before it leaves, with a key that never does. Anything on its way is noise to everyone else, us included.
Pieces go straight across your Wi-Fi to your other computers, or through your encrypted cloud when they are far apart.
Your other computer unlocks the pieces and puts the file back together. Same file, same folder, on every device you own.
Computers on the same network find each other and sync directly. No account, no cloud, no monthly fee, and it keeps working when the internet is down.
When your devices are far apart, locked pieces wait in your cloud. A computer that was switched off catches up the moment it comes back.
Files kept in your cloud still show in File Explorer and Finder. Open one and it downloads on the spot; mark a folder to keep it on this computer.
When a change arrives from another computer or from someone you share with, the copy it replaced is kept. Open the history to bring it back, and anything you delete waits in Deleted before it goes.
Invite someone by email, hand a folder to a device in the same room, or send a link. A link carries its key after the #, a part browsers never send to a server.
A screen recording of ShieldSync: a photo dropped into a folder on a Windows laptop appears in Finder on a Mac a few seconds later.
Your files on the left, exactly as you see them. On the right, the same files as they sit on our servers. Scroll, and watch them cross.
Sizes and when something changed, so we can count your storage and tell your other devices there is something new.
Every name and every byte is locked on your device before it is uploaded. What reaches us is noise with a size.
It is made on your device from your password and never sent to us. That is also why we can’t reset it: keep your recovery code somewhere safe.
A 2 GB film doesn’t travel again because you trimmed its first seconds. ShieldSync finds the pieces that changed and sends only those. Try it.
Pick a change to see what travels.
Syncing between your own computers is free, and so are your first 5 GB in the cloud. A plan adds room, version history and online-only files.
Sync every device you own, with 5 GB of encrypted cloud to start. No card, no trial clock.
Add an encrypted copy off-site, for the day a laptop is lost or stolen.
More room, a year of history and an audit log.
Download ShieldSync, choose a folder, and your other computers start keeping up. No account is needed to sync your own devices.