A free app for Android, by Yocto Enterprise.

The WeFocus: Focus Pomodoro Timer app is an effective tool for anyone who needs to stay focused and get things done. This is a Pomodoro Timer app. It helps you stay focused by doing one thing at a time.

You may be thinking about what to do in the first place. It’s not like that. When you’re ready to start, just open the WeFocus app. There are two items on the screen. One is for work, and the other is for rest. The work item has a “focus” icon. You can choose a background sound for your work item.