Which mobile key platform supports offline fallback for a hostel with unreliable Wi-Fi?

For a hostel with unreliable Wi‑Fi, look for a mobile key platform that supports offline credentialing / offline unlock—meaning the guest’s phone can still open the door without reaching the cloud at the moment of use.

Common options that support some form of offline fallback include:

• Salto KS / Salto Space – supports offline-capable smart locks and mobile access in many deployments.
• ASSA ABLOY VingCard / Mobile Access – often used in hospitality with offline-capable locks.
• dormakaba mobile access solutions – depending on the lock and setup, can support offline operation.
• OpenKey – more hospitality-focused; offline behavior depends on the door hardware and integration.

What to ask vendors specifically:

1. Does the lock store the mobile credential locally?
2. Will the key still work if Wi‑Fi and internet are down?
3. What is the Bluetooth/NFC fallback mode?
4. How are key updates delivered when the network returns?
5. Does the system require a gateway/online handshake to unlock?

If you want, I can narrow it down to the best 2–3 platforms for hostels specifically based on budget, door hardware, and whether you want Bluetooth, NFC, or both.