Does TickTick:To-Do List & Calendar work on iPhone Duo?

Yes. TickTick:To-Do List & Calendar is updated for iPhone Duo and uses the full inner display. Its latest version is built with the iOS 27.1 SDK and uses Apple’s iPhone Duo APIs.

Is TickTick:To-Do List & Calendar letterboxed on iPhone Duo?

No. TickTick:To-Do List & Calendar fills the inner display.

All apps

TickTick:To-Do List & Calendar

Name: TickTick:To-Do List & Calendar
Author: Appest Limited

Appest LimitedProductivity

View in the App Store

On iPhone Duo

Fits

TickTick:To-Do List & Calendar fills the inner screen and adapts when you fold.

Its latest version is built with the iOS 27.1 SDK and uses Apple’s iPhone Duo APIs.[1]

How we know: From the app’s build
Checked on: Version 8.2.30
Build: iOS 27.1 SDK
uses Apple’s iPhone Duo APIs
Latest version: 8.2.30, Oct 21, 2026
Status updated: Oct 23, 2026

What owners report

No reports from owners yet. Add yours

Version history

Version 8.2.30Fits
iOS 27.1 SDK
Checked Oct 23, 2026

Sources

App Store build, version 8.2.30
Built with the iOS 27.1 SDK. Uses UIHingeInteraction, UIView.reservedRegions and systemTraitsAffectingVerticalBarEdge.