Does Watch to 5K work on iPhone Duo?
Yes. Spaceman Digital Ltd added iPhone Duo support in version 8.2.1 (22 October 2026): Watch to 5K is now optimised for iPhone Duo, with layouts that adapt beautifully whether folded or unfolded.
- On iPhone Duo
- Adapted
- Developer
- Spaceman Digital Ltd
- Category
- Health & Fitness
- Current version
- 8.2.1 · 22 October 2026
- App Store rating
- 4.8 out of 5 (892 ratings)
- Last checked
How we know
Apple or the developer says the app is built for iPhone Duo's inner screen. See it on the App Store
History on iPhone Duo
- · Adapted (version 8.2.1)
Other Health & Fitness apps on iPhone Duo
-
YazioYAZIO · Health & FitnessUpdated, unconfirmedUpdated 27 October 2026 -
move2paySVAX GmbH · Health & FitnessUpdated, unconfirmedUpdated 26 October 2026 -
komootkomoot GmbH · Health & FitnessUpdated, unconfirmedUpdated 21 October 2026 -
AutoSleepTantsissa · Health & FitnessNot yetLast update 15 September 2026 -
HealthFitStephane Lizeray · Health & FitnessAdaptedRelease notes, version 12.16.4 -
StravaStrava, Inc. · Health & FitnessUpdated, unconfirmedUpdated 26 October 2026 -
StreaksCrunchy Bagel · Health & FitnessUpdated, unconfirmedUpdated 18 October 2026 -
Flo ciclo menstrual y periodoFLO HEALTH UK LIMITED · Health & FitnessUpdated, unconfirmedUpdated 22 October 2026
All apps on iPhone Duo in Germany →
Got an iPhone Duo? How does Watch to 5K look on the inner screen?
No owner report yet for version 8.2.1.
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Good to know
Does Watch to 5K work on iPhone Duo?
Yes. Spaceman Digital Ltd added iPhone Duo support in version 8.2.1 (22 October 2026): “Watch to 5K is now optimised for iPhone Duo, with layouts that adapt beautifully whether folded or unfolded.”
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 5 October 2026, use the whole display.
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 (22 October 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.