Duo Fold Counter
Count every fold & unfold
Only for iPhone
$0.99 · Designed for iPhone. Not verified for macOS.
iPhone
Count every fold and unfold – now optionally in the background too. (GPS Backround Location Service must be enabled) Private, on-device.
How often do you really fold your phone? Duo Fold Counter counts every fold and unfold of your foldable iPhone, turns it into clear statistics and shows you how much of your hinge's estimated life you've already used.
COUNTS LIVE, CATCHES UP LATER
While the app is open, it reads the system hinge sensor and counts every fold and unfold in real time. Folded it while the app was closed? When you come back, Duo Fold Counter notices the change and records it as an "inferred" fold, so your history stays complete. You can also log folds manually at any time.
OPTIONAL: COUNT IN THE BACKGROUND
Want every fold counted, even with the app closed? Turn on "Count in background" in Settings. iOS only lets apps keep running in the background with location, so while this is on the app keeps location active – you'll always see the location indicator – and detects folds with the magnetometer: the halves of your phone contain magnets, and closing it brings one close to the compass sensor. Folds detected this way get a "sensor" badge in your history. It's off by default and uses some extra battery.
STATISTICS THAT TELL A STORY
• Folds per day and your total over time
• Time spent folded, half open and unfolded
• Opening angles: tent, laptop or flat
• How long your phone usually stays unfolded
• Time of day, weekdays and a weekday × hour heatmap
• Where you fold: a map of your fold spots and your top 3 places (optional)
• Full history of every recorded fold
QUESTIONS, ANSWERED
The Questions tab turns your data into plain-language insights:
• When do you fold the most?
• Is today busier than usual?
• Which weekday is your folding day?
• How long does it stay unfolded?
• Do you fold more on weekends?
• How long would the hinge last at this pace?
• Where do you fold the most?
ESTIMATED HINGE LIFETIME
Set the rated number of folds (75,000 by default, adjustable) and see what percentage you've used and roughly how long your hinge will last at your current pace.
WIDGETS
Keep your fold count and estimated lifetime on your Home Screen and Lock Screen.
PRIVATE BY DESIGN
No account, no tracking, no ads. All your data stays on your device. Location is only used if you turn on background counting or "Record fold locations" – fold locations are stored on your device, and only place names are looked up via Apple Maps.
MORE
• English and German
• Light and dark mode
REQUIREMENTS
Automatic counting requires a foldable iPhone with a hinge sensor. On other iPhones you can log folds manually and explore every statistic with sample data (Settings → Load sample data).
Get to know your fold habits — download Duo Fold Counter today.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Julian Christopher Siebert, 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
- Seller
- Julian Christopher Siebert
- Size
- 1.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 27.1 or later.
- iPhone
Requires iOS 27.1 or later. - Mac
Requires macOS 27.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 27.2 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English and German
- Age Rating
4+
- 4+
- Copyright
- © 2026 Christopher Siebert
