School Bell Simulator is a free Android app developed by Dmitsoft. The app is a simple simulation program that helps you keep track of time during school hours. It contains four loud school bells that ring when lessons start and finish.

The app is straightforward and easy to use. You can set the bell to ring at specific times, and it will alert you when it's time to start or finish a class. The app is perfect for teachers who want to keep track of time during lessons or for students who want to practice their time management skills.

Overall, School Bell Simulator is a useful app for anyone who needs to keep track of time during school hours. It's free, easy to use, and contains all the features you need to stay on schedule. However, it's worth noting that the app only contains four bells, so it may not be suitable for larger schools with more classes.