Penumbra - Smart Theme Control

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.