Schildbach BTC wallet as the name implies, is a wallet for Bitcoin. Although it also supports other crypto currency. With this wallet, one can send and receive Bitcoin through either Bitcoin URL.
wallet was recommended to me some years back. It is an interesting wallet. As it provides an easy interface to the user.
BTC wallet is mostly found in android devices. I am yet to see the iOS version of it. But I believe the developers are doing something about the desktop version of it.
When it comes to security, schildbach BTC wallet offers high level security. As the user has control over the security of the wallet. The safety of Bitcoin and other tokens present in this wallet is ensured.