Samsung's Good Lock app, which was available exclusively through Samsung Galaxy storeis now available from Google's Play Store.
However, the Good Lock app is listed in the Google Play Store with the tag 'Early Access', so it's best not to download it from the Play Store on your primary phone.
Good lock • One-handed operation+
In related news, Samsung has also released the Good Lock module One Hand Operation+ on the Google Play Store, giving Samsung users the option to download it from the Galaxy Store or the Play Store. You can go to the links below to download them.
To download: Good lock, One-handed operation+ | Through