Devices & sync
Sync & backup
How Citadel syncs your encrypted vault across iPhone, iPad, Mac and Windows, how your data is protected in transit, and what you need to back up.
How sync works
When you add or change an item, Citadel encrypts it on your device and uploads only the encrypted copy. Your other devices download it and decrypt it locally. Sync happens automatically; there's nothing to set up.
Our servers only ever store your data in encrypted form, and only you hold the keys.
Protected three times in transit
3HTTPS
The connection itself is protected with TLS.
2Session encryption
Every request and response is encrypted again with AES-256-GCM, using a session key agreed at sign-in.
1Your data
Already encrypted with your vault key before it leaves your device.
Your devices
Citadel runs on iPhone, iPad, Mac and Windows. To add a device, install Citadel and sign in with your email and master password. Your vault appears automatically.
- Free: sync on up to 2 devices
- Premium: sync on all your devices
Do I need a backup?
Your encrypted vault is stored in the cloud, so if you lose or replace a device, you just sign in on the new one and your items come back.
Keep your master password somewhere safe: only you know it. More about your master password