Foldle
Daily Fold Puzzle
Each day there’s a new origami silhouette. Fold a square of paper to match it, then share how many folds it took without giving the answer away.
Paper apps for phones that fold.
Paper & Hinge is a tiny studio making two iPhone apps around the fold of the new iPhone Duo. Both work on every iPhone. On the Duo, the hinge joins in.
Our apps
Riffle
Flipbook Animator
Draw frame by frame with onion skin, then close the phone to play your flipbook, like thumbing through a real one. Export it as a video or a GIF.
Made for the fold. Fine without it.
iPhone Duo has a hinge, so we gave it something to do. Every other iPhone gets the same apps, with a drag wherever the Duo has a fold.
On iPhone Duo
In Foldle, choose where to fold, then fold the phone and the paper folds with it. In Riffle, close the phone slowly and your drawings flick past like pages under your thumb.
Hinge controls arrive in a free update shortly after launch. Until then, dragging works everywhere, including on iPhone Duo.
On any iPhone
Drag a corner to make a fold. Drag the page edge to riffle. Everything the hinge does, a finger can do too, on any iPhone with iOS 26 or later.
The small print, up front
- Price
Both apps are free to download. Pro costs the same in each: $2.99 a month, $14.99 a year with a one-week free trial, or $29.99 once for lifetime access.
- Privacy
Neither app collects any data. There are no accounts and no analytics, and everything you make stays on your phone. Read the privacy policy.
- Release
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Both apps came to the App Store on Oct 23, 2026, the day iPhone Duo shipped. Both are free to download.