K3OPS vs TennisKeeper

K3OPS RF energy havasting system

All K3OPS products recycle electricity using the Surrounding RF Energy Harvesting system as a source to operate or to charge the batteries of all kind of electronic products in everyday life.

Help tennis players stay motivated and maximize their enjoyment of the sport.

TennisKeeper is a new and free iOS app. It tracks your tennis activities, scores, footwork, and tennis strings usage. You can visualize your progress and see how you are improving over time.

Track your singles or doubles matches, hitting practices, tennis lessons and cross-training activities. Record your opponent's games style using our easy to use templates. Interactive dashboards display your match stats, total time spent, calories burned, steps count, head to head stats and many more. Share your scores, notes, and tennis photos with your friends or on social media.

TennisKeeper integrates with your Apple HealthKit so that you can understand your movement on the tennis court. Your data is stored on Apple iCloud so that it is safe and secure. No additional account creation is required.