Penumbra - Smart Theme Control

Seamlessly shift any website between dark and light themes with intelligent element detection.

Penumbra — Elegant Dark Mode for the Web 🌑 Step into the shade. Penumbra transforms every website into a beautifully crafted dark theme — reducing eye strain, saving energy, and making late-night browsing comfortable. 🌙 Instant Dark Mode One click to darken any website. Bright backgrounds become deep, comfortable tones while text stays crisp and readable. ⏰ Auto Day/Night Switching Set your schedule or sync with system preferences. Penumbra switches between light and dark automatically — dark at night, light by day. 🎨 Fine-Tuned Control Adjust brightness, contrast, sepia, and color temperature to match your comfort level. Save different settings for different websites. 📋 Whitelist Some sites already have great dark modes? Add them to the whitelist and Penumbra will leave them untouched. 🖼️ Smart Element Detection Images, videos, logos, icons, and embedded media are preserved in their original colors. Only backgrounds, text, and UI elements are transformed. 👁️ Eye Comfort Reduce blue light exposure and visual fatigue. Softer contrast and warmer tones help you browse longer without strain — especially at night. ⚡ Lightweight & Smooth No white flash on page load. Minimal memory footprint. Instant application with no visible delay. Protect your eyes. Install Penumbra and browse in comfort.