Does FLKB work on iPhone Duo?
Yes. Shota Hori says so on the App Store: iPhone Duo では、フロント画面とインナー画面の縦持ち・横持ちそれぞれに保存できます。
- On iPhone Duo
- Adapted
- Developer
- Shota Hori
- Category
- Productivity
- Current version
- 1.6.6 · October 27, 2026
- App Store rating
- 4.7 out of 5 (7 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 1.6.6)
Other Productivity apps on iPhone Duo
-
ChatGPTOpenAI OpCo, LLC · ProductivityUpdated, unconfirmedUpdated October 27, 2026 -
Muse from MetaMeta Platforms, Inc. · ProductivityAdaptedRelease notes, version 13.1 -
Claude by AnthropicAnthropic PBC · ProductivityUpdated, unconfirmedUpdated October 28, 2026 -
Google GeminiGoogle · ProductivityUpdated, unconfirmedUpdated October 27, 2026 -
Microsoft AuthenticatorMicrosoft Corporation · ProductivityUpdated, unconfirmedUpdated October 20, 2026 -
Goblin ToolsSkyhook · ProductivityNot yetLast update August 23, 2026 -
Grok AIX Corp. · ProductivityUpdated, unconfirmedUpdated October 26, 2026 -
Microsoft CopilotMicrosoft Corporation · ProductivityUpdated, unconfirmedUpdated October 26, 2026
All apps on iPhone Duo in Canada →
Got an iPhone Duo? How does FLKB look on the inner screen?
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Good to know
Does FLKB work on iPhone Duo?
Yes. Shota Hori says so on the App Store: “iPhone Duo では、フロント画面とインナー画面の縦持ち・横持ちそれぞれに保存できます。”
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.
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.