Pick a sound. Put your phone down. Act innocent.
WHOOPS! is a playful sound app that reacts to movement. Set up a little surprise with bold black-and-white comic visuals and a collection of funny sound effects.
19 SOUNDS, THREE WAYS TO PLAY
Choose from 8 fart effects, 5 animal sounds and 6 comic effects. Tap a tile to preview and select a sound, or choose a random sound within a category.
TIME TO SET THE SCENE
Set a preparation countdown from 3 to 30 seconds. Press Start prank and place your phone somewhere safe. When the countdown finishes, the app watches for movement and plays your chosen sound once when triggered.
FIND THE RIGHT SENSITIVITY
Adjust sensitivity from 1 to 10. The silent sensitivity test shows movement and rotation gauges with visible trigger lines, so you can check how your phone responds before starting.
READY WHEN YOU ARE
• No account, ads or in-app purchases
• Built-in sound effects that work offline
• Optional sound previews on selection and haptics
• English, Korean, Japanese and Simplified Chinese
Check your device's media volume before starting. Sensor response varies by device and surroundings. Keep your phone somewhere safe; do not sit on it or place weight on it. Keep pranks lighthearted and enjoyable for everyone.
Contact support: support@esangdan.com
WHOOPS! has no account, advertising, analytics or tracking SDKs. Motion and rotation readings are processed only on your device for sound triggering and sensitivity tests; they are not recorded or sent to a server. Sounds are bundled with the app. The app does not record your microphone. Language, sensitivity, preparation time, selected sound, haptics and preview preferences are stored on your device. They may be included in operating-system backups depending on your settings and can be reset by clearing app data. Support emails are processed to answer your request. Contact: support@esangdan.com
Operator: E Sangdan Co., Ltd.
Effective: 2026-10-12