For most, keys loss is a larger risk than coin theft, Bitkey is implemented with trusted data backup solutions, using your own iCloud document, which is encrypted and protected by the sandbox mechanism.
Weak passwords cannot resist any brute force attacks. Bitkey uses security questions/answers enhance your password, which can add 100 bits of entropy to your password. This will effectively resist brute force attacks.
BitKey provides 2-of-2 multisig-timelock address, this is a two-factor wallet and greatly avoids single point risk. Another advantage, even if your cold keys(seeds/mnemonics) lost, you can still spend coins after timelock expired.
BitKey is first released on AppStore in 2014 and is still keeping simple now. BitKey is a worldwide product and many users like BitKey‘s design.