Does Who work on iPhone Duo?
Probably, but it's not confirmed. Who was updated on October 19, 2026 (version 13.8), after Apple's iPhone Duo tools came out, but RD LABS LLC doesn't mention iPhone Duo. Apps built with Apple's standard components fill the inner screen on their own once rebuilt.
- On iPhone Duo
- Updated, unconfirmed
- Developer
- RD LABS LLC
- Category
- Utilities
- Current version
- 13.8 · October 19, 2026
- App Store rating
- 4.1 out of 5 (5,017 ratings)
- Last checked
How we know
Updated since Apple's iPhone Duo tools came out (October 5, 2026), but the developer doesn't mention the Duo. Apps built with Apple's standard components fill the inner screen on their own. See it on the App Store
History on iPhone Duo
- · Updated, unconfirmed (version 13.8)
Other Utilities apps on iPhone Duo
-
ShadowrocketShadow Launch Technology Limited · UtilitiesNot yetLast update September 7, 2026 -
GoogleGoogle · UtilitiesUpdated, unconfirmedUpdated October 26, 2026 -
Jumper VPNFree VPN One Co., Limited · UtilitiesUpdated, unconfirmedUpdated October 27, 2026 -
Google ChromeGoogle · UtilitiesUpdated, unconfirmedUpdated October 27, 2026 -
CleanupDEEP FLOW SOFTWARE SERVICES · UtilitiesUpdated, unconfirmedUpdated October 27, 2026 -
DuctWise HVAC Duct CalculatorYaniv van der Stigchel · UtilitiesUpdated, unconfirmedUpdated October 26, 2026 -
NoirJeffrey Kuiken · UtilitiesAdaptedRelease notes, version 2026.2.2 -
StashSTASH NETWORKS LIMITED · UtilitiesUpdated, unconfirmedUpdated October 21, 2026
All apps on iPhone Duo in the US →
Got an iPhone Duo? How does Who look on the inner screen?
No owner report yet for version 13.8.
Still looking for the iPhone Duo itself? Restocks sell out within minutes: get an alert the moment one lands near you.
Good to know
Does Who work on iPhone Duo?
Probably, but it's not confirmed. Who was updated on October 19, 2026 (version 13.8), after Apple's iPhone Duo tools came out, but RD LABS LLC doesn't mention iPhone Duo. Apps built with Apple's standard components fill the inner screen on their own once rebuilt.
Why do some apps have black bars on iPhone Duo?
Because they were built before Apple's iPhone Duo tools. On the inner screen, an app built for an older iOS opens in an iPhone-size window on a black background; one built for iOS 27.0 uses more of it but leaves some space blank; only apps built with the iOS 27.1 SDK, which developers have had since October 5, 2026, use the whole display.
When will Who be adapted to iPhone Duo?
Only RD LABS LLC knows. We check Who on the App Store again within about 1 h: this page changes as soon as a new version says it supports iPhone Duo.
Do apps that aren't adapted still work on iPhone Duo?
Yes. Every iPhone app runs on iPhone Duo: one that isn't adapted just doesn't fill the inner screen until its developer updates it.
How we measure
Sources: Apple's list of apps adapted to iPhone Duo (October 22, 2026) and each app's App Store record (version, release date, release notes, description). Apple doesn't say which tools an app was built with, so an app stays “Updated, unconfirmed” until its developer says more.