Jump Coin

What is Jump Coin?

Jump Coin is a motion game: hold your smartphone and physically jump, and the device's built-in accelerometer detects the movement and plays a retro game-style coin chime. Coins pile up with every jump, and your jump height is estimated from how long you stayed airborne (hang time). It's great for getting kids moving, adding a little fun to a workout, or counting jumps during skipping or jump exercises. The sound is synthesized on your device, so there are no audio files to download, and everything runs locally in your browser.

How to play

1. Open it on a smartphone and tap "Start (allow sensor)".
2. On iPhone, choose "Allow" when asked for motion sensor access.
3. Grip your phone firmly with one or both hands (don't drop it!).
4. In a safe space clear of people and objects, jump in place.
5. When you land, a coin chime plays and your coin count goes up by one.
6. Your last jump's estimated height and your personal best are shown.
7. Keep jumping to collect coins — every 10 coins triggers a confetti celebration.
8. On PCs and other sensorless devices, use the "Tap for coin sound" button to play.

Great for

• Getting kids moving

  A sound plays with every jump, so kids stay motivated to keep moving their bodies.

• Home workout motivation

  Jumps pile up as coins, turning an otherwise monotonous exercise into something fun to keep up.

• Counting skips and jumps

  It counts jumps automatically, handy for tracking reps of jumping in place or light exercise.

• Jump-height contests

  It estimates jump height from hang time, so you can compete with friends and family over who jumps highest.

• A quick refresh

  Stand up and do a few jumps between desk-work sessions for an easy, quick refresh.

• Party and event fun

  See who can collect the most coins or jump the highest — a fun group activity.

Privacy

Jump Coin runs entirely on your device. Accelerometer readings are used only on-device to detect jumps and are never sent anywhere. The coin sound is synthesized on the fly with the browser's Web Audio feature, so there are no audio files to download and no requests to external servers. The only thing saved is your personal-best jump height, and that lives only in your device's local storage.

FAQ

Q. Is it free to play?

A. Yes, no signup and completely free. There's no usage limit — play as much as you like.

Q. How does it detect jumps?

A. It uses your smartphone's built-in accelerometer. During a jump the device is nearly weightless (free fall), and landing produces a strong impact. Jump Coin reads this characteristic pattern to detect a jump.

Q. I tapped "Allow" on iPhone but nothing happens.

A. On iPhone / iPad, Safari must have motion & gyroscope access enabled. Go to Settings → Safari → "Motion & Orientation Access", turn it on, then reload the page and try again.

Q. Can I play on a PC?

A. Most PCs have no accelerometer, so real jump detection isn't available. In that case use the "Tap for coin sound" button to enjoy the chime. Open it on a smartphone to play with real jumps.

Q. Is the jump height accurate?

A. It's an estimate computed from hang time using basic physics. How you hold the phone and time your landing introduces error, so treat it as a rough, fun ballpark rather than a precise measurement.

Q. There's no sound.

A. Check that your phone's silent/mute switch isn't on and the volume isn't turned down. Sound is enabled when you press the "Start" button, so always begin from that button.

Q. Any safety tips?

A. Grip your phone firmly and play in a safe space clear of people and objects. Take care not to throw or drop the device.

Q. Is any data sent externally?

A. No. Sensor readings and coin-sound generation all happen on your device with no external communication. Only your best height is saved locally.