Productivity v4.2.4
Does Fantastical Calendar work on iPhone Duo?
Yes. Fantastical Calendar is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
At a glance
- Inner display (7.6″)
- Built for Duo
- Outer display (5.4″)
- Works normally
- Built with
- iOS 27.1 SDK
- Version 4.2.4, read Oct 24, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v4.2.4
- Oct 23, 2026
- Duo in release notes
- Mentioned
About Fantastical Calendar
Fantastical Calendar is made by Flexibits Inc. and first came out on the App Store in October 2013. It has 24,827 ratings on the US App Store, averaging 4.2 stars. Version 4.2.4 came out on Oct 23, 2026 and needs iOS 17.6 or later. It's free to download. Among the 46 productivity apps we track on the US App Store, 28 already fill the inner display, 3 are partly adapted and 15 still show black bars. By number of ratings, Fantastical Calendar is #35 of them.
From its App Store listing:
Fantastical is the award-winning calendar app with powerful features including intuitive natural language text parsing, beautiful full calendar day, week, month, quarter and year views, tasks, time zone support, and much, much more. TRY FANTASTICAL FOR FREE • Beautiful, clean, and easy to use calendar app allowing you to manage basic events • The DayTicker and calendar makes your schedule look the…
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
Apple named it in its iPhone Duo launch roundup on October 22: it shows calendars, tasks and menus together.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Fantastical Calendar. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
- Adaptive layoutRearranges into sidebars or multiple panes on the inner display instead of just stretching.
Evidence & history
Apple,
Developers bring incredible new app experiences to iPhone Duo (Apple Newsroom)
Apple says it shows calendars, tasks and menus together.
App build,
Version 4.2.4 is built with the iOS 27.1 SDK
Apps built with the iOS 27.1 SDK or later can use the whole inner display.
Release notes,
Release notes for version 4.2.4
- Added support for iPhone Duo - Improved duration handling for Todoist tasks created with the natural language parser - The parser no longer erases m…
App Store,
App Store listing has screenshots made for iPhone Duo
The developer published 9 screenshots for iPhone Duo’s inner display.
- : Not confirmed yet → Built for Duo — Named in Apple’s iPhone Duo launch roundup
Latest release notes
Version 4.2.4 · Oct 23, 2026
- Added support for iPhone Duo - Improved duration handling for Todoist tasks created with the natural language parser - The parser no longer erases manually set due dates when the new sentence doesn't include dates - Fixed an issue where creating a task in Todoist would add an extra alarm - Fixed an issue where calendar mirroring could trigger rate limiting from the calendar service - Various fixes and improvements By the way, App Store reviews are very helpful to us. If you think Fantastical is worthy, would you mind taking a moment to write a nice review? We'd greatly appreciate it. Thanks for using Fantastical! :)
Questions
Does Fantastical Calendar work on iPhone Duo?
Yes. Fantastical Calendar is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does Fantastical Calendar work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use Fantastical Calendar in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.