Next Coinbase which I think is widely used is Coinbase. I think the security features are almost the same as Xapo but in Coinbase provides more features. In Coinbase not only Bitcoin can be accommodated, but also Ethereum and Litecoin. Users do not have to bother using lots of wallet to accommodate altcoin like this. But the lack of this wallet is not able to drag rupiah / wd to local banks, so you must use exchanger services.