How can I seamlessly change between Light and Dark styles?

There currently isn't a way to automatically achieve this due to iOS restrictions that prevent changing wallpapers when toggling between Light or Dark mode.

However, if you have an iPhone with an Action Button you can create an action for it that does this instead.

Part 1: Prepare wallpapers

1. Open the iOS Settings app
2. Create a wallpaper for Light Mode, using the Minimal Light wallpaper
3. Create a second wallpaper for Dark Mode, using the Minimal Dark wallpaper

Part 2: Create a shortcut

1. Open the Apple Shortcuts app
2. Create a shortcut that includes the following actions, linking the created wallpapers to it
3. Tap the name at the top to rename it to something you will easily remember

You can omit the Set Launcher action if you don't want to switch between app launchers.

Part 3: Link the Action Button

1. Return to the Home Screen
2. Open the iOS Settings app → Action Button
3. Swipe across to the Shortcut action, and tap the menu button to select the previously created shortcut

Part 4: Set the Auto Background and Text colors

1. Open Dumb Phone → Launcher Style
2. Under the Background section, select the Auto Dark / Light color
3. Under the Text section, select the Auto Black /White color

Once this is completed, press the Action Button to switch between Light and Dark styles 🪄

Use Back Tap instead of the Action Button

If your iPhone does not have an Action Button, you can still leverage an iOS feature named Back Tap, where you can double-tap the back of your iPhone with your index finger and run an action.

How to configure Back Tap

1. Open iOS Settings → Accessibility → Touch
2. Select Back Tap → Double-tap
3. Link the created shortcut

Other Alternatives

Automations

It is possible to create an Automation in Apple Shortcuts that observes Sunrise & Sunset events, and have that run the aforementioned shortcut.

However, this relies on the timing of those particular events to occur rather than simply when Light or Dark Mode is turned on.

Focus Filters

You can also link particular App Launchers and wallpapers to Focus modes, which when turned on will seamlessly adjust your device. See more in the Related Articles below.