Does My CheckBox work on iPhone Duo?

Yes. My CheckBox is updated for iPhone Duo and uses the full inner display. Version 1.76 (September 29) release notes: “Improved the layout to support iPhone Duo screen resolutions.”

Is My CheckBox letterboxed on iPhone Duo?

No. My CheckBox fills the inner display.

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My CheckBox

Name: My CheckBox - Todo Calendar
Author: jang sehoon

jang sehoonProductivity

View in the App Store

On iPhone Duo

Fits

My CheckBox fills the inner screen and adapts when you fold.

Version 1.76 (September 29) release notes: “Improved the layout to support iPhone Duo screen resolutions.”[1]

How we know: Claimed by the developer
Latest version: 1.79, Oct 10, 2026
Status updated: Oct 18, 2026

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Sources

App Store: My CheckBox 1.76 release notes

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