Does Calendars work on iPhone Duo?

Yes. Calendars has been updated for iPhone Duo and uses the full inner display. Version 5.41.2 (October 30) release notes: “With day-one support for iPhone Duo, Calendars makes the most of the expanded display”.

Is Calendars letterboxed on iPhone Duo?

No. Calendars fills the full inner display.

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Calendars

Name: Calendars: Schedule Planner
Author: Readdle Technologies Limited

Readdle Technologies LimitedProductivity

View in the App Store

On iPhone Duo

Fits

Calendars fills the inner screen and adapts when you fold.

Version 5.41.2 (October 30) release notes: “With day-one support for iPhone Duo, Calendars makes the most of the expanded display”.[1]

How we know: Claimed by the developer
Latest version: 5.41.2, Oct 30, 2026
Status updated: Nov 7, 2026

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Sources

App Store: Calendars 5.41.2 release notes

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