Your iPhone Duo is full of water.

A glass of water on the closed phone. Unfold it and the glass pours across the fold into an aquarium, with a goldfish to raise.

Coming soon to the App StoreWatch it pour

The closed iPhone Duo showing a glass of water with a goldfish inside.

Closed, it's a glass.

Tilt the phone and the water sloshes. Tip it too far and it spills over the rim.

Open it.

Unfold your iPhone Duo and the glass tips over toward the fold.

The open iPhone Duo: the water has poured across the fold into a wide aquarium.

It pours across the fold.

The water runs from one half to the other, waves and all, with your fish riding it.

Now it's an aquarium.

Both halves, sand to surface. Room for seaweed, decorations and the whole gang.

Two players, one per half.

In Fish hop duel, each of you taps your own page. In Fold jump, the fish leaps over the crease.

Goldie loved it!

Goldie reached level 10!

Goldie became a jellyfish!

Want a nudge when Goldie is hungry?

Every fish gets a name, and the app uses it. Type one to see real lines from Goldfold.

Or try

A goldfish taking its first bite of flakes. — **Feed it flakes, pellets, worms or a pea.** Four foods, each with its own reaction. Every bite earns experience.

The aquarium at night with the fish asleep. — **Turn off the lamp and it sleeps.** The tank goes dark, the fish dozes off and floats in place.

The fish swimming to the front of the glass while the app listens. — **Call it by name and it swims over.** Speech is recognized on the phone. Nothing is recorded.

Drawing a circle on the glass to teach the fish to spin. — **Teach it to jump and to spin.** With your voice, a clap or a finger on the glass. A trick takes a few days to learn.

Fresh water filling the glass. — **Keep the water clean, or it clouds.** Empty it and fill it again to clear it. A little always stays for the fish.

Ten games in the tank

Coral breaker, Sea trio, Coral stack, Fish hop, Bubble hoops, Pellet rain, Fold jump, School, Shell and pearl, and a two-player duel across the fold. Playing earns pearls for special food and decorations.

Arcade

In the water

**Pellet rain** Touch anywhere and push the way the fish should swim. Catch the pellets before they hit the bottom.

**Bubble hoops** Touch anywhere and push the way the fish should swim. Get it through each ring before it pops.

**Fold jump** Tap to make the fish leap over the fold. Time it to go through the ring.

**Shell and pearl** Watch the pearl, follow the shells, pick the right one.

3 species
Up to level 20
A gang of 4

Your fish starts small, in a glass. Every bite and every game makes it grow: new colours, then eggs that hatch into a gang of four. At level 10, the way you raised it decides what it becomes: a betta, or a glowing jellyfish.

There are 26 achievements, an album to fill, eight decorations for the tank and a care streak that counts the days.

A glowing jellyfish in the aquarium at night.

Made for the fold, happy on any iPhone

The closed iPhone Duo with a goldfish in a glass of water.

iPhone Duo, closed

A glass that sloshes

iPhone Duo, open

The aquarium, across the fold
Fold jump: The fish leaps the fold
Fish hop duel: Two players, one per half

Any iPhone

Same fish, same games
Widget: Feed and pet it from there

Requires: iOS 18 or laterLanguages: 10Apps for iPhone Duo

Questions, answered

What is the iPhone Duo?

It's Apple's foldable iPhone. Closed, it has a narrow outer screen; open, a wide inner screen that folds down the middle like a book. Goldfold uses both: a glass outside, an aquarium inside.

Do I need an iPhone Duo?

No. On any iPhone, Goldfold is the glass with your fish and all the single-player games. The Duo adds the pour, the aquarium across both halves, Fold jump and the two-player duel.

Does it collect my data?

The app has no account, no analytics, no ads and no tracking. Your fish and your progress stay only on your phone. This website counts visits with Umami on our own server: no cookies and no name or email, only the page, the referrer, the browser, the device and the country.

Why does it ask for the microphone?

Only for Call, to hear claps and words like its name, “jump” or “spin”. Speech is recognized on the phone and nothing is recorded or sent.

Which languages does it speak?

English, Portuguese, Spanish, German, French, Italian, Japanese, Korean and Chinese (simplified and traditional).