Top Spin: Spinning Top RPM

TopSpin turns your Android phone into a spinning top measurement tool.

Place your phone level, add a suitable spinning surface such as a small concave glass, spin your top and let TopSpin measure the run using your phone’s built-in motion sensors.

TopSpin can measure and display:

• Real-time spinning top RPM
• Maximum RPM
• Total spin time
• Relative vibration throughout the run
• RPM decay
• Complete RPM and vibration graphs
• Estimated remaining spin time
• Kinetic energy and moment of inertia when top dimensions and materials are entered
• Automatic end-of-spin detection
• Built-in bubble level for repeatable setup

The vibration graph can reveal much more than spin time alone. Different launches can produce different amounts of precession and vibration, while individual tops can show recognisable behaviour as they slow. Compare repeated runs, different tops, different materials and different setups.

TopSpin includes multiple measurement modes:

NORMAL
For most hand-spun precision tops.

HIGH SPEED
For faster tops and launcher-spun tops.

AEVUM
For very long-running and extremely low-speed spins.

No external RPM sensor, microphone or special electronics are required. TopSpin uses the sensors already inside your Android phone.

For best results, level the phone, use a clean stable spinning surface, keep the phone and table still, and allow the top to settle briefly before starting measurement.

Whether you collect precision spinning tops, make your own, experiment with top design, or simply want to know how fast and how long your top really spins, TopSpin gives you a repeatable way to measure and compare each run.