Penumbra - Theme Mode Changer

How to install Open in Chrome Web Store

CRX ID

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Status

Description from extension meta

Quickly change any site between dark and light modes using smart contrast detection.

Image from store

Description from store

Penumbra — Smart Dark Mode 🌑

Make any website dark for comfortable browsing. Auto-switches themes based on time of day.

🌙 One-Click Dark
Flip any site to dark mode instantly.

⏰ Auto Switching
Dark at night, light by day — automatic.

🎨 Customisable
Tweak brightness, contrast, warmth per site.

📋 Whitelist
Keep certain sites in light mode.

🖼️ Media Preserved
Images and videos stay in original colours.

👁️ Eye Care
Less strain, less blue light.

⚡ Fast
No flash, no slowdown.

Get Penumbra and browse comfortably.

Extension Actions