Pemark is a free benchmarking app for Android devices developed by Perseum. It is a simple yet powerful tool that calculates the number of operations per second that your phone can perform and compares it to a database of results provided by all the different devices. This allows you to compare your phone's performance with other devices in a standardized way.

The interface of Pemark is minimalistic and easy to use. You just need to tap the "Run Benchmark" button and wait for the test to complete. Once the test is done, you will get a score that represents the performance of your phone. You can then compare your score with the scores of other devices in the database.