Penumbra - Dark & Light Switcher

Shift any webpage between dark and light appearance with intelligent color analysis.

Penumbra — Dark Mode Done Right 🌑 Stop blinding yourself at night. Penumbra makes every website dark — beautifully, instantly, and automatically. 🌙 One-Click Dark Flip any site to dark mode. Clean, readable, comfortable. ⏰ Auto Scheduling Dark at night, light during the day. Syncs with system preferences or your custom schedule. 🎨 Customize Everything Brightness, contrast, warmth, sepia — your call. Per-site settings included. 📋 Whitelist Skip sites that already look good in dark mode. 🖼️ Media Preserved Images and videos stay in original colors. Only backgrounds adapt. 👁️ Eye Protection Less blue light. Softer contrast. Made for late-night sessions. ⚡ Fast No white flash. No slowdown. Works instantly. Get Penumbra and take the strain off your eyes.