Leechblock is a tool that allows to block distracting sites. Unfortunately it is not available for Android.

I am looking for any tool for Android - it may be a special browser, it may be a browser + extension combination, it may be paid software, it may be free software with ads.

Requirements:

- rooting phone is not required
- makes possible to block list of domains, making them unavailable for browsing
- it is possible to browse other websites (so ColdTurkey/uninstall browser etc are not a solutions)
- strongly preferable, required for paid tool: list of domains may be copied to tool/loaded from file
- in case of a paid tool - it has clearly positive reviews and is without any ads