Underwater Photography

The Best Camera App for the iPhone 18 Pro Max

You paid for the best camera Apple has ever made, and its own app still won't let you set ISO. Here's what each alternative unlocks, and which one suits the way you shoot.

By Olivia Steeples · Updated 2 October 2026 · ~8 min read

The iPhone 18 Pro Max has a variable aperture, a 48 MP main sensor and a chip fast enough to grade 4K on a train. When Apple added Pro Controls to the Camera app, it finally felt like the phone was being treated as a real camera. Then you set a shutter speed, and ISO quietly sets itself.

That's the gap every camera app on this list is trying to close. The hardware can do more than Apple's software lets it. If you've spent the money on the phone, it's fair to want all of it.

What Apple's Camera app gives you now

Pro Controls work in photo and video. You can set the aperture (four steps on the main camera, from f/1.48 to f/4), the shutter speed from 1/16000 s to one second, and white balance, with a live histogram to check your exposure. It's clean, quick and good enough for most people most of the time.

What it won't do is let you choose ISO. As Tom's Guide put it, when you fix aperture and shutter, ISO moves to make up the difference. You get a brighter picture, and the noise that comes with it, whether you wanted it or not.

The camera apps worth installing

Diving Standard is our app, so weigh this accordingly. We've described the others by what they actually do; check the App Store for current prices.

Why the extremes matter

The 18 Pro Max sensor reports a fastest exposure of about 1/71429 s. Apple's app stops at 1/16000 s, a little over two stops short. At the other end it stops at one second. Our camera goes to 1/70000 s, and past one second it stacks exact one-second frames up to 8 seconds.

• At the fast end, you can shoot wide open at f/1.48 on a bright beach without blowing out the sky, freeze spray off a breaking wave, or stop a fish mid-turn.
• At the slow end, two to eight seconds turns moving water to mist and traffic to ribbons. Put the phone on a tripod: anything from one second up needs it perfectly still. More in long exposure on the iPhone 18 Pro Max.
• ISO in between. Pick the lowest ISO the light allows and lock it. On a phone's small sensor, that's one of the easiest ways to get a cleaner file. We explain why in the iPhone 18 Pro Max has no manual ISO.

If you shoot anywhere near the sea

Phones assume you're standing on land. Underwater, or even through a few metres of clear water when you snorkel, that assumption breaks: auto white balance reads the blue as the scene's true colour and you come home with flat, cyan pictures. Our camera uses white balance tuned for water, with presets by depth, and its True Colour correction shows you the fixed picture in the viewfinder while you frame it.

Which one should you pick?

• You want manual control and don't want to relearn your camera: Diving Standard.
• You shoot in or near water, or want long exposures past one second: Diving Standard.
• You shoot RAW on land and love a crafted interface: Halide.
• You want priority modes and every setting exposed: ProCamera.
• You just want quick, great photos: Apple's Camera app is better than it has ever been.

Most people end up keeping Apple's camera on the lock screen and a manual one a tap away. For a control-by-control look at the two, read Apple's camera vs a better camera app.