A free app for Android, by Alpha Apps Studio.

This is the most secure and best password generator app available for Android. It supports over 40 different cryptographically secure pseudo-random number generators (PRNGs). It is an open-source application, so you can download the source code and build your own custom versions for different applications. You can use the same password for all of your accounts, and you don’t need to save or share it with anyone. It has multiple modes of operation, so you can select the mode you want to use for your password. You can choose the length of the password, the number of characters, and the character set.

This app is designed for Android devices.