Finance v2.8.20
Does Polymarket work on iPhone Duo?
Yes. Polymarket runs full screen on iPhone Duo's inner display, though it doesn't have Duo-specific features yet.
At a glance
- Inner display (7.6″)
- Full screen
- Outer display (5.4″)
- Works normally
- Built with
- Not read yet
- We read each app's build SDK after it updates
- iPad version
- No
- Phone-only layout today
- Latest version
- v2.8.20
- Nov 4, 2026
- Duo in release notes
- Not yet
About Polymarket
Polymarket is made by Polymarket and first came out on the App Store in September 2024. It's #90 on today's US App Store top charts. It has 64,970 ratings on the US App Store, averaging 4.6 stars. Version 2.8.20 came out on Nov 4, 2026 and needs iOS 18.0 or later. It's free to download. Among the 25 banking & finance apps we track on the US App Store, 8 already fill the inner display, 4 are partly adapted and 12 still show black bars. By number of ratings, Polymarket is #24 of them.
From its App Store listing:
With over 30 million users globally, Americans can now trade on the World's Largest Prediction Market™ Polymarket is a federally regulated exchange that lets you trade real-world events against other market participants, so prices move with the wisdom of crowds. Live odds show you where the smart money really sits, a sharp tool whether you're researching sports picks, weighing insights, or forecas…
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Polymarket. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 2.8.18 is built with the iOS 27.1 SDK
Apps built with the iOS 27.1 SDK or later can use the whole inner display.
- : Not confirmed yet → Full screen — built with the iOS 27.1 SDK
Latest release notes
Version 2.8.20 · Nov 4, 2026
The World's Largest Prediction Market™ is now CFTC regulated & legal in the United States.
Questions
Does Polymarket work on iPhone Duo?
Yes. Polymarket runs full screen on iPhone Duo's inner display, though it doesn't have Duo-specific features yet.
Does Polymarket work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use Polymarket in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.