Harmonograph: Pendulum Art
Collect pendulum light art
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
◆ One-of-a-kind geometric art, drawn by a pendulum
Harmonograph recreates a classic 19th-century drawing machine: two swinging pendulums whose overlapping motion traces a glowing line that slowly spirals toward the center of the screen.
Every drawing starts with slightly different parameters, so the same pattern never appears twice. What you see being drawn is truly one of a kind.
◆ Discover, collect, and decorate
DISCOVER
- A new pattern is drawn before your eyes every time you start
- Watch the glowing pen tip as each line is born
- Tap "Again" to meet the next one-of-a-kind pattern
- Pause anytime to enjoy the moment
COLLECT
- Save your favorites to the gallery with a name of your choice
- Patterns are classified into 4 types (petal, star, spiral, loop) with a rarity from 1 to 5 stars
- 20 combinations in total: can you discover them all?
DECORATE
- Export saved patterns as iPhone-sized wallpapers (1290 x 2796)
- Choose from 5 background themes: navy, jet black, deep green, wine, and ink purple
- Composed to stay clear of the clock and icons on your lock screen
◆ Designed for quiet moments
- Works fully offline (network is used only to show ads)
- No account required, no personal information collected
- Your saved recipes stay on your device only
Harmonograph is free, supported by a small banner ad and an occasional full-screen ad when saving wallpapers.
Sit back and enjoy the trail of light drawn by the pendulum.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
A new title screen welcomes you, with the pendulum's patterns drawing quietly in the background.
You now choose when drawing begins. Nothing moves until you tap Start.
The pattern's type and rarity stay hidden until drawing begins, so every pattern is a small surprise.
The damping slider has been renamed and simplified into 9 clear steps. Slide right for denser, more layered patterns.
No ads are shown on the title screen.
Other minor improvements.
The developer, Takashi Nemoto, 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 Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Takashi Nemoto
- Size
- 4.7 MB
- Category
- Entertainment
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Takashi Nemoto