Root Checker is described as 'This tool does not root your Android phone, it just checks if your phone have been rooted or not'. There are three alternatives to Root Checker for Android and Android Tablet. The best alternative is Root Verifier, which is both free and Open Source. Other great apps like Root Checker are Rootsu - root checker (Free) and Root Checker Pro (Freemium).
Root Checker and Root Check Pro lets you check if your device has been rooted, if it's SafetyNet compatible and it can check battery charging/discharging current and voltage. All with just a tap for check.