Two screens, two layouts
A lock screen is a poster with a clock. A home screen is a filing cabinet with stickers on the drawers. Apple’s wallpaper tools let you set those screens separately, or as a pair, and optionally blur the Home Screen.[1] Android’s wallpaper picker has the same Home / Lock / both split.[2] One image can theoretically do both, and for years people used one image for both. The result is usually a compromise: a flower crushed under icons, or a flat mint that looks empty when the phone is locked and you actually look at it.
We design and write as if you will set two files. You do not have to. The pages are clearer if you know which job we had in mind. Clock numerals and icon labels still need contrast against whatever sits behind them.[3][4][5]
Lock screen: keep a place to look
When the phone is idle, you see the art. A lake, a meadow, a bougainvillea on a wall, a paint splash on paper — those are lock-screen files. Keep the top third quieter than the subject. If your OS shows notifications as a stack, leave the middle not too dark, or the cards will float in a hole.
Always-on displays show a dim, sometimes monochrome version of the lock screen. A file with a clear silhouette (a branch, a horizon) survives that dimming better than a low-contrast pastel wash, which can vanish into grey.
Home screen: keep a place for work
Icons are the content. The wallpaper is a tablecloth. Material Design 3 treats surfaces and accent content as different color roles for the same reason: the chrome has to stay readable.[6] Solids, near-solids, and low-contrast paint are the tablecloths in this library: mint faces, cream chibi paper, tan strokes, split teal plaster if you crop to the quieter half. If you insist on a floral home screen, pick the sakura wash, not the noon bougainvillea.
Widgets change the math. A giant clock widget wants a calm field behind it, the same way the lock-screen clock does. A weather widget can sit on a lake horizon and look intentional. Test with the widgets you actually use, not an empty home screen in a screenshot.
Pairs that already exist here
Mint face on the home screen, aqua sleeper or teal plaster on the lock screen. Navy brushstroke at home, dusk lake locked. Tan gradient at home, terracotta strokes locked. Sakura wash at home, bougainvillea locked. None of those pairs are a product bundle. They are just files that share a temperature so the phone does not look like two different people own it.
The collection pages list what is in each hue. The wallpaper pages say whether we treat that file as a field or a subject. If a page does not say, look at the top third: empty means field, busy means subject.
When one file is enough
Some people want less fuss. Use a mid-tone field on both screens: mint, tan, navy-to-sky. You will not have a poster to look at when the phone is idle. You will have a phone that always works. That is a complete product.
If you change your mind later, you already know the rule. Add a subject to the lock screen. Leave the field under the icons. Do not do the reverse unless you enjoy hunting badges.