Dark mode saves less battery than you think, at normal brightness. Dark mode is often sold as a way to save energy. On phones with OLED screens, it does help at full brightness. But most of us keep our screens at thirty to fifty percent indoors. There, the saving is small. Researchers at Purdue University found that dark mode saves little battery at normal brightness. At full brightness, it saved thirty-nine to forty-seven percent of screen power. At thirty to fifty percent brightness, only three to nine percent. GreenCode keeps advice like this in mind in its work. Here is the fix you can use today. Offer dark mode, because people like it. But do not claim big energy savings for it. Spend your effort on page weight, scripts and background work first. Tools like Lighthouse find heavy pages, unused code and big images. And if you make an energy claim, measure it on real phones, at real brightness. GreenCode helps tackle this by cutting page weight on its own website. Its home page's first view went from six point eight megabytes to one point seven. That was GreenCode Tech Tip number sixty. Follow for the next tip, and find more on greencode.ai/tech-tips.