iPhone 18 Pro vs iPhone 18 Pro Max vs iPhone Duo: Which New iPhone Should You Buy?

For the first time, choosing a new iPhone this fall means choosing between three very different shapes: the compact 6.3-inch iPhone 18 Pro, the big-screen 6.9-inch iPhone 18 Pro Max and the foldable iPhone Duo. All three share the A20 Pro chip and support 25W MagSafe and Qi2 charging, so the decision comes down to size, cameras, battery and how you like to hold your phone.

Here is how they compare, and which kind of case suits each one. For a feature-by-feature rundown, read our guide to what's new in Apple's latest lineup.

Side-by-Side Comparison

Figures from Apple's official technical specifications.

Choose iPhone 18 Pro If You Want Pro Cameras in a Smaller Phone

iPhone 18 Pro gets the same camera system as the Pro Max: the variable-aperture 48MP Main, 48MP Ultra Wide and 48MP 4x Telephoto, plus Pro controls and Apple Reference Image. MacRumors notes Apple says its battery life now matches last year's iPhone 17 Pro Max at up to 24 hours of typical use. At 211 g, it is the lightest of the three and the easiest to use one-handed.

Case advice: because it is compact, you can afford a little more protection without the phone becoming unwieldy. A Dual Armor Lens Stand Case or the Clear MagSafe Case with Camera Lens Stand adds drop protection and a stand while staying pocketable. Shop all iPhone 18 Pro cases.

Choose iPhone 18 Pro Max If Battery Life Comes First

Apple calls iPhone 18 Pro Max's battery gain the largest increase ever on iPhone: up to 30 hours of typical use and up to 45 hours of video playback on eSIM-only models. The 6.9-inch screen is ideal for video, games and reading, and the camera system is identical to the smaller Pro.

Case advice: at 249 g, grip and drop protection matter. Cushioned corners like the Air Cushion MagSafe Case help, and a wallet such as the Rugged Card Holder Wallet Case for iPhone 18 Pro and Pro Max lets the big phone replace your wallet. Our published iPhone 17 and 18 Pro Max case buying guide compares Pro Max case styles in depth.

Choose iPhone Duo If You Want a Bigger Screen That Folds Away

iPhone Duo is for people who want tablet-like space without carrying a tablet. Open, the 7.6-inch display supports Split View multitasking and, later this year, Apple Pencil (USB-C). Closed, the 5.4-inch outer screen delivers 90 percent of iPhone 18 Pro's screen area in a pocketable, passport-like shape. The trade-offs: no 4x Telephoto or variable aperture, Touch ID instead of Face ID, and a thicker 11.3 mm profile when closed.

Case advice: choose a two-part case that protects the hinge, such as the Hinge-Armor Frosted MagSafe Folding Kickstand Case. Our best iPhone Duo cases guide covers every style.

Storage, Colors and Durability

All three models come in 256GB, 512GB, 1TB and 2TB capacities. MacRumors points out this is the first time 2TB is offered on the smaller Pro, not just the Pro Max, which matters if you shoot a lot of ProRes or 4K120 video. iPhone 18 Pro and Pro Max come in Black, Silver, Glacier and Burgundy, while iPhone Duo comes in Star White and Night Sky. Every model is rated IP68 for splash, water and dust resistance.

Upgrading From an Older iPhone?

Coming from an iPhone 17 Pro or iPhone 17 Pro Max, the 18 Pro models will feel familiar: MacRumors describes them as looking very similar, with the biggest gains in camera, battery and sustained performance. Plan on a new case listed for your exact model. Coming from the ultra-thin iPhone Air, iPhone 18 Pro is the closest in feel, while Duo is the more dramatic change.

Material Choice: Leather, Clear or Rugged?

• Leather-texture: the Leather-Texture MagSafe Case has a textured finish with a microfiber lining and lists both iPhone 18 Pro and iPhone 18 Pro Max.
• Clear: show off the new Burgundy or Glacier finish with iPhone Clear Cases.
• Rugged: for job sites and outdoor use, see iPhone Heavy Duty Cases.

Whichever you choose, add screen and lens protection using our camera and screen protection guide.

Frequently Asked Questions

Do iPhone 18 Pro and iPhone 18 Pro Max have the same cameras?

Yes. Apple lists the same 48MP Pro Fusion camera system, including variable aperture and the 4x Telephoto, on both models.

Which new iPhone has the best battery life?

iPhone 18 Pro Max, rated by Apple for up to 30 hours of typical use. iPhone 18 Pro and iPhone Duo are both rated for up to 24 hours.

Can iPhone 18 Pro and Pro Max share a case?

No. They are different sizes, so buy a case made for your exact model.

Is iPhone Duo heavier than iPhone 18 Pro Max?

Slightly. Apple lists iPhone Duo at 254 g and iPhone 18 Pro Max at 249 g.