There is an Android companion, and nothing at all for iOS
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WALLPAPER ENGINEANSWERS
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diagramWallpaper Engine for Android is a separate paid app that imports wallpapers from the Windows desktop version, and no iOS version of it exists.
That is two purchases and one absence. The desktop program is where the library lives, the phone app is a second product sold on its own, and an iPhone sits outside the arrangement completely. Wallpaper Engine is a Steam program that plays animated wallpapers on a Windows desktop, published under the name Wallpaper Engine by Kristjan Skutta, and it is paid software that has never had a free tier.
The Android app is a companion to the Windows version, not a copy of it
The Android companion is sold separately from the desktop program, and its route to content is an import from the desktop version rather than a catalog of its own. That shapes what you can expect from it. A wallpaper already sitting on the Windows machine is the thing the phone app is built to receive, so the Windows install is the working end of the pair and the phone is the display end.
The desktop program is Windows only. There is no macOS build and none has been announced, which means a Mac is not a source library for the phone app either. A reader whose only computer is a MacBook has no version of this software to run at all, and that is not a settings problem: no import, changer app or theme pack will produce one.
The pixels an Android phone actually asks for
An Android phone asks for a much taller frame than any desktop, and that, not the app, is what decides whether a picture survives the transfer. Mainstream Android panels run 1080 x 2400 and flagship panels run 1440 x 3120. Both are far taller than wide, at aspect ratios of 20:9 and 19.5:9, which is taller than any ratio artwork is ever composed in.
| Device class | Pixels | Aspect |
|---|---|---|
| Mainstream Android | 1080 x 2400 | 20:9 |
| Flagship Android | 1440 x 3120 | 19.5:9 |
| iPhone 6.1 in standard | 1179 x 2556 | 3x scale |
| iPhone 6.7 / 6.9 in Max | 1290 x 2796 | 3x scale |
| iPhone SE (3rd gen) | 750 x 1334 | 2x scale |
The consequence is blunt. Scale a 16:9 desktop file to fill the height of a 9:19.5 phone and the file has to be about 3.85 times as wide as the screen, so the vast majority of the picture is off frame. The same picture is a different file on every screen it lands on, and the phone is the most extreme case of that in the whole set.
The lock screen and the home screen are two different slots
The lock screen holds a different image from the home screen on a phone, and treating them as one slot is the commonest reason a wallpaper looks wrong in one place and right in the other. On iOS the two slots are explicit: Lock Screen and Home Screen can hold different images, the lock screen reserves the top of the frame for the clock and the bottom for the flashlight and camera buttons, and Depth Effect pushes the clock behind a subject and refuses to engage on images with no clear foreground.
On Android there is no single answer, and the honest statement is that behavior is launcher specific. Android has historically asked for a wallpaper wider than the screen so the launcher can scroll it between home screens, and the conventional guidance is a file roughly twice the screen width where parallax is supported. Many current launchers no longer scroll, in which case that extra width is simply cropped away. Test the file on the launcher you actually run rather than trusting a rule.
Why there is no Wallpaper Engine for iPhone
There is no Wallpaper Engine for iPhone and there is no equivalent from anyone else, because iOS does not hand the wallpaper slot to third party software. The picture is set in Settings, from an image, into one of the two slots iOS keeps. A program that draws continuously onto the background, which is what Wallpaper Engine is, has nothing to attach itself to. A live wallpaper is a video your device never stops playing, and on iOS there is no place for an outside program to play one.
WHAT THIS RULES OUT
An app promising Wallpaper Engine on iPhone cannot be doing what the Windows program does. At most it is a gallery that hands a still image to the system wallpaper setting, which is a job the Photos app already does.
What to set on an iPhone instead
Set a still file that already matches the phone's native pixel count, and the result is as sharp as the panel can render. That means 1179 x 2556 on the 6.1 in standard class, 1290 x 2796 on the 6.7 and 6.9 in Max class, and 750 x 1334 on the SE. Compose so the middle of the frame carries the subject, because the clock occupies the top and the two shortcut buttons occupy the bottom.
Finding the picture is the easy part. Whether it is yours to set is the part that decides the outcome, and the file's aspect ratio is the part that decides how much of it you keep.
Free alternatives exist, and every one of them is a desktop program
Two genuinely free alternatives exist, Lively Wallpaper and ScreenPlay, and both are open source. Lively Wallpaper runs on Windows. ScreenPlay is cross platform. Neither is a phone app, so neither closes the gap for a reader who wanted Wallpaper Engine on Android without paying, and neither exists for iOS for the same structural reason the paid app does not.