Timegrapher is a free Android app developed by Timerity that measures the accuracy of your mechanical watch. It uses your device's microphone to detect the ticking of your watch and provides you with detailed information about its performance.

With Timegrapher, you can easily detect the beats per hour (BPH) and measure the beat rate and beat error of your watch. Additionally, you can measure the amplitude and set the lift angle of your watch. The app also displays beat noises in real-time, such as unlock, impulse, and lock sounds.

One of the best features of Timegrapher is that it displays the accuracy and beat error of your watch over time. You can also save and share your measurements, track watch position and power reserve, and manage multiple watches. The app provides measurement statistics by watch and position, and also measures magnetism.

Overall, Timegrapher is a must-have app for any mechanical watch enthusiast who wants to keep track of their watch's performance. With more features coming soon, this app is definitely worth trying out.