Vault is currently available to new customers on iOS and Android. Customers who joined Vault before June 2017 can access their accounts in our web application. We're working to combine our mobile and web app experiences and hope to have this work done soon.
Vault currently supports iPhones running iOS 8 and above. You can download Vault for iOS from the App Store now.
Vault also supports Android running 4.1 and above. You can download Vault for Android now.