Grumpy Grid
Tap, Bounce, Compose Music
Free · Designed for iPad. Not verified for macOS.
Tap. Bounce. Compose.
Grumpy Grid is a musical playground where bouncing balls play your tunes. Place a colored ball anywhere on the canvas and it falls into a steady, perfect bounce on a row of musical pads below — playing a note every time it lands. Drop a few more, and a rhythm builds itself.
No tutorials, no learning curve. The eight pads are tuned so anything you place sounds harmonic together. Drop balls higher for slower, sparser rhythms; lower for faster, busier ones. Stagger your taps to layer notes a fraction of a beat apart and you've got a loop.
Made for play and for sketching:
• Eight glowing color pads, each tuned to its own pitch
• Snap to quarter, eighth, sixteenth, or eighth-triplet rails for tight grooves
• Save and rename your sessions — every ball's bounce timing comes back exactly as you left it
• Eraser for surgical edits; Clear wipes the canvas; Pause actually pauses time
• Universal: iPhone in landscape, iPad in any orientation
No accounts. No tracking. No ads. Nothing leaves your device.
Tap, bounce, compose.
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The developer, Lukasz Pomianek, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Lukasz Pomianek
- Size
- 5 MB
- Category
- Music
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - iPad
Requires iPadOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Lukasz Pomianek