Ethan Crossfield 
Apple's newly released iPhone Duo is already finding an unexpected gaming use. A major Delta emulator update has adapted the foldable device's two-screen format for Nintendo DS-style play, giving retro fans a premium and unusually flexible handheld option.
What happened: Delta added iPhone Duo support
The first-generation iPhone Duo launched on October 23 with a starting price of $1,999. A day earlier, Delta developer Riley Testut released version 2.0 of the free App Store emulator, including layouts designed around the phone's foldable display. Delta can run software from several classic systems, including Nintendo DS, NES, SNES, and Sega Genesis. On the Duo, players can use one side as a control area and the other as the main game display, closely matching the physical arrangement that defined Nintendo's dual-screen handheld.
Why it matters: foldables fit the DS format naturally
Emulation on phones is not new, but the iPhone Duo gives Delta a hardware setup that better suits DS games than a conventional single-panel handset. The update adds skins that can be adjusted across the device's different folded and unfolded positions, in both portrait and landscape. It also introduces a Liquid Glass interface, Split View support, and Sega Genesis controller skins. Perhaps the most fitting detail is sleep behavior: folding the phone during a game can suspend play, echoing the simple lid-close feature of the original Nintendo DS.
What to watch next: access and price remain the limits
Delta does not ship with Nintendo or Sega games, so users must provide their own files. One source-supported route is extracting ROMs from physical cartridges they own with Epilogue's GB or SN Operators before transferring those files to the iPhone Duo. Apple loosened App Store restrictions around emulators in 2024, and Delta has since reached 20 million downloads, according to its developer. Still, the Duo's $1,999 entry price makes this a niche retro setup rather than an affordable replacement for dedicated handheld hardware.
What players should know
- Delta is free on the App Store, but it does not include game files.
- The iPhone Duo layouts are built for multiple folded and unfolded device positions.
- Folding the phone can put a supported game session to sleep.
- Players should use game files obtained from cartridges they own through legitimate methods.
Key figures
| Metric | Reported figure |
|---|---|
| iPhone Duo starting price | $1,999 |
| Delta downloads | 20 million |
| iPhone Duo launch date | October 23 |
Expert View
The iPhone Duo and Delta combination shows why foldables remain compelling for retro gaming: the hardware can recreate a format that flat screens only imitate. But this is a showcase for the form factor, not a mass-market DS substitute. Delta benefits from an ideal device match, while Apple still has to justify a flagship-level price to players who can buy dedicated retro hardware for far less.
