Vertical Jump Measure: Hopmark

Measure your vertical jump with nothing but your phone. Hold it against your chest, jump, and Hopmark shows your jump height in centimetres or inches the moment you land.

HOW IT WORKS
While you are in the air, your phone falls freely with you. Hopmark reads the motion sensor hundreds of times per second, finds the exact moment of takeoff and landing and calculates your jump height from the flight time (h = g·t²/8), the same formula jump mats and force plates use. No video, no frame counting, no mat, no second person.

WHAT YOU GET FOR FREE
• Unlimited vertical jump tests with your height, flight time and rating
• Dunk calculator: how many centimetres you are away from touching the rim and from dunking
• Jump duel for two players: pass the phone, best of three wins
• Share card with your result for your story, so your friends can try to beat it
• Today's jumps on the jump wall

HOPMARK PRO
• Analysis of every jump: takeoff speed, peak power in watts, push-off and landing force
• Full history with daily best curve and a before and after card for your vertical jump training
• Hop series: ground contact time and reactive strength index (RSI)
• Duels and team tests for up to 8 players
• Dunk forecast from your own progress
Pro is available as a monthly or yearly subscription. The yearly plan comes with a free trial. Measuring stays free.

BUILT FOR VERTICAL JUMP TRAINING
Basketball, volleyball, sprinting, high jump or simply curious: test your vertical jump before and after a block of vertical jump training and see the gain in black and white. Every test is saved with date and time, so your jump height becomes a number you can track.

HONEST NUMBERS
Hopmark explains every number with a tap on "Why?". Jumps with tucked knees or a moving phone are discarded instead of inflated. The rating uses published reference values for adults, the power estimate uses the Sayers formula. Hopmark is a training tool, not a medical device.

PRIVATE
No account. Your jumps stay on your phone and move to a new phone with Android backup. Hopmark counts anonymous usage statistics (for example how often the Pro page is opened) without any device or advertising ID.

Questions or ideas: info@saracai.de

Recent changes:
First release: measure your vertical jump with the motion sensor, dunk calculator, jump duel, history and analysis.