A free program for Android, by Kiddoware.

Safe Browser Parental Control is a parental control app for Android devices. It lets you block websites on your child’s phone, tablet, or computer to prevent them from accessing harmful or inappropriate content. The app works as an internet filter and an advanced safe search engine. It blocks sites that contain adult content, violence, or other harmful elements, and lets your child browse the internet freely. The app also lets you set a time limit for your child to use the internet, and blocks the child from accessing websites that you deem inappropriate. How does it work? The Safe Browser Parental Control app blocks the internet on your child’s device. It works as an internet filter and an advanced safe search engine. It lets you block websites that contain adult content, violence, or other harmful elements. You can also set a time limit for your child to use the internet. The app lets you block websites that you deem inappropriate.