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 · 27 October 2026
- Popularity
- #19 in the top charts in Japan
- 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 27 October 2026 -
Muse from MetaMeta Platforms, Inc. · ProductivityAdaptedRelease notes, version 13.1 -
Google GeminiGoogle · ProductivityUpdated, unconfirmedUpdated 27 October 2026 -
Microsoft AuthenticatorMicrosoft Corporation · ProductivityUpdated, unconfirmedUpdated 20 October 2026 -
Claude by AnthropicAnthropic PBC · ProductivityUpdated, unconfirmedUpdated 28 October 2026 -
GmailGoogle · ProductivityUpdated, unconfirmedUpdated 26 October 2026 -
Google DriveGoogle · ProductivityUpdated, unconfirmedUpdated 26 October 2026 -
Google スプレッドシートGoogle · ProductivityUpdated, unconfirmedUpdated 26 October 2026
All apps on iPhone Duo in Japan →
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 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.