Entertainment v2.0
Does Delta work on iPhone Duo?
Yes. Delta is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
At a glance
- Inner display (7.6″)
- Built for Duo
- Outer display (5.4″)
- Works normally
- Built with
- Not read yet
- We read each app's build SDK after it updates
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v2.0
- Oct 22, 2026
- Duo in release notes
- Mentioned
About Delta
Delta is made by Testut Tech and first came out on the App Store in April 2024. It has 28,321 ratings on the US App Store, averaging 4.8 stars. Version 2.0 came out on Oct 22, 2026 and needs iOS 17.4 or later. It's free to download. Among the 45 video & streaming apps we track on the US App Store, 22 already fill the inner display, 7 are partly adapted and 15 still show black bars. By number of ratings, Delta is #42 of them.
From its App Store listing:
Delta is an all-in-one emulator for iOS and iPadOS. Delta builds upon the strengths of its predecessor, GBA4iOS, while expanding to include support for more game systems such as NES, SNES, N64, Nintendo DS, and Sega Genesis. FEATURES Supported Game Systems • Nintendo Entertainment System • Super Nintendo Entertainment System • Nintendo 64 • Game Boy (Color) • Game Boy Advance • Nintendo DS • Sega …
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.
Delta’s developers teased a “Delta Duo” update for October 2026, and lead developer Riley Testut says dedicated iPhone Duo support is planned, building on the app’s existing resizing and multi-window work. No release date has been announced.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Delta. 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
Release notes,
iPhone Duo • Delta unfolds in all new ways to take full advantage of iPhone Duo • Optimized controller skins for every pose in bot…
App Store,
App Store listing has screenshots made for iPhone Duo
The developer published 6 screenshots for iPhone Duo’s inner display.
- : Not confirmed yet → Built for Duo — release notes for 2.0 say it supports iPhone Duo
Latest release notes
Version 2.0 · Oct 22, 2026
iPhone Duo • Delta unfolds in all new ways to take full advantage of iPhone Duo • Optimized controller skins for every pose in both portrait and landscape • Supports Split View multitasking with other apps • Folding Duo puts DS games to sleep, just like closing the lid of a real DS Sega Genesis • Delta does what Nintendon’t! • Sega Genesis games are now playable in Delta • New controller skins for iPhone and iPad recreate the classic Genesis controller look • Built-in support for Action Replay and GameGenie cheats Liquid Glass UI • Fresh new UI designed from the ground up for Liquid Glass • Fully adapts to all screen sizes from Duo to iPad • System icons mark every page in your Game Library • Default artwork now has a light, glassy look RetroAchievements • Sign in with your RetroAchievements account to earn achievements in any supported game • Supports Hardcore mode, which disables loading save states and using cheats • Shows your achievement progress when you launch a game Recents & Favorites • New "Recently Played" and "Favorites" pages in Game Library • Quickly jump back in to your most recently played games • Add games to "Favorites" via long-press for easy access Animated Controller Skins • Controller skins come to life with support for fully animated buttons and controls • Supports 3rd-party skins, so skin creators can make their own • Try Delta’s new official animated GBA skin, designed by Caroline Moore Audio Settings • New audio settings to control how Delta h
Questions
Does Delta work on iPhone Duo?
Yes. Delta is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does Delta 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 Delta 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.