Does ColorfulCam work on iPhone Duo?

Yes. ColorfulCam is updated for iPhone Duo and uses the full inner display. Version 1.9.21 (October 28) release notes: “增加iPhone Duo腰平取景模式” (adds a waist-level viewfinder mode for iPhone Duo).

Is ColorfulCam letterboxed on iPhone Duo?

No. ColorfulCam fills the inner display.

All apps

ColorfulCam

Name: ColorfulCam
Author: 俊龙 林

俊龙林Photo & video

View in the App Store

On iPhone Duo

Fits

ColorfulCam fills the inner screen and adapts when you fold.

Version 1.9.21 (October 28) release notes: “增加iPhone Duo腰平取景模式” (adds a waist-level viewfinder mode for iPhone Duo).[1][2]

How we know: Claimed by the developer
Checked on: Version 1.9.20
Build: iOS 27.1 SDK
Latest version: 1.9.21, Oct 28, 2026
Status updated: Oct 28, 2026

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Version history

Version 1.9.20Fits
iOS 27.1 SDK
Checked Oct 28, 2026

Sources

App Store: ColorfulCam 1.9.21 release notes
App Store build, version 1.9.20
Built with the iOS 27.1 SDK. Uses none of Apple’s iPhone Duo APIs.