What "changing app color" actually means

When you change the color of an app, you are changing how that app looks on your screen — not the app itself or how it works. Most apps let you pick a color scheme (usually called a "theme" or "appearance setting"), which changes the background, text, buttons, and icons within that app. Some phones and computers also let you change colors system-wide, which affects all your apps at once.

The confusion happens because "app color" can mean three different things: the color scheme inside one specific app, the overall theme your phone or computer uses, or the app's icon color on your home screen. This guide covers all three, because the steps are different for each one.

Key Takeaways

  • Most apps have their own color or theme settings buried in the app's settings menu, separate from your phone's system settings.
  • Your phone's system settings (like dark mode or light mode) affect all apps at once, but individual apps can override these choices.
  • Changing an app's icon color on your home screen usually requires a third-party launcher app or widget tool, not a built-in feature.
  • Dark mode saves battery on phones with OLED screens and reduces eye strain in low light, which is why many apps offer it.

Changing colors inside a single app

Most apps have their own appearance or theme settings. The location varies by app, but the path is usually: open the app, tap the menu icon (three horizontal lines or three dots), look for "Settings" or "Preferences," then find "Appearance," "Theme," or "Display."

Common options include dark mode (white text on a dark background), light mode (dark text on a light background), and sometimes a third option called "auto" or "system" that matches your phone's overall setting. Some apps like Gmail, Slack, or Spotify also let you pick accent colors — the color used for buttons, links, and highlights. These are usually found in the same settings menu under "Color" or "Accent."

Not every app offers color choices. Smaller apps or older apps may only work in one color scheme. If you do not see a theme or appearance option after checking the settings menu, that app probably does not have one.

Changing colors across your whole phone or computer

Your phone or computer has its own system-wide color setting, separate from individual apps. On most Android phones, go to Settings, then Display, then look for "Dark mode" or "Theme." On iPhones, go to Settings, then Display & Brightness, and choose Light, Dark, or Auto. On Windows computers, go to Settings, then Personalization, then Colors. On Mac computers, go to System Settings, then Appearance.

When you turn on dark mode at the system level, most apps will switch to dark mode automatically — but not all. Some apps ignore your system setting and stick to their own choice. If an app is still light when your phone is in dark mode, check that app's individual settings to see if it has its own theme toggle.

The "Auto" setting on phones switches between light and dark mode based on the time of day or your location's sunset time. This is useful if you want dark mode at night and light mode during the day without manually changing it.

Changing an app's icon color on your home screen

The icon you see on your home screen — the small picture you tap to open the app — is usually controlled by the app itself, and you cannot change it through normal phone settings. However, some phones let you customize this using a launcher app or widget tool.

On Android, you can read a third-party launcher like Nova Launcher or Microsoft Launcher, which lets you change icon colors, shapes, and sizes. You set the launcher as your default home screen, and then customize icons within the launcher's settings. On iPhone, you can create custom app icons using the Shortcuts app (built into iOS), which lets you design a colored button that opens the app when tapped. This is more work than Android launchers, but it gives you full control.

Keep in mind that custom launchers and shortcuts are extra layers on top of your phone's system. They use a small amount of battery and storage, and they may slow down your phone slightly if you use many of them.

Why apps offer different color options

Dark mode exists for two practical reasons: it reduces eye strain in low light, and on phones with OLED screens (most newer iPhones and high-end Android phones), it uses less battery because OLED pixels can turn completely off to show black. On older phones with LCD screens, dark mode does not save battery.

Some apps also let you pick accent colors — the color of buttons, links, and highlights — because different people find different colors easier to read or more pleasant to look at. This is especially useful for people with color blindness or light sensitivity.

What happens when apps and your phone disagree on color

If your phone is set to dark mode but an app is set to light mode, the app wins. Your phone's system setting is a suggestion, not a rule. The app's own setting overrides it.

This can be frustrating if you want everything dark but one app refuses. Your options are: change that app's individual setting if it has one, switch to a different app that respects your system setting, or accept that one app will look different. There is no way to force an app to follow your system setting if the app's developer chose not to support it.

Frequently Asked Questions

Does changing app colors affect how the app works?

No. Color changes are purely visual. Changing from light mode to dark mode does not change any features, speed, or data. It only changes what you see on screen.

Will changing colors use more battery?

Dark mode may use slightly less battery on phones with OLED screens, but the difference is usually small — a few percent per day. On LCD screens, dark mode makes no difference to battery life. Changing accent colors or icon colors has no effect on battery at all.

Can I change colors for just one app while keeping others light?

Yes. Change the color setting inside that one app, and leave your phone's system setting alone. The app's own setting will override your phone's system setting.

Why does my app still look light even though I turned on dark mode?

The app's developer may not have built dark mode support into that app. Check the app's own settings menu to see if it has a theme or appearance option. If not, the app only works in light mode.

Do I need to restart my phone after changing colors?

No. Color changes take effect when ready. If a color change does not show up right away, close the app and reopen it, but you do not need to restart your whole phone.