sFilter - Blue Light Filter

Protect your eyes from blue light with sFilter - Blue Light Filter, the lightweight screen protection app designed to reduce eye strain and improve sleep quality during extended device use.

Blue light exposure from your phone or tablet can cause eye fatigue, blurred vision, and sleep disruption, especially during evening hours. This app blocks harmful blue light by overlaying an optimized color filter directly on your screen. Choose from 18 carefully selected filter colors that feel natural while effectively reducing eye strain—no artificial tint that ruins your viewing experience.

Control your blue light filter effortlessly through multiple methods. Quickly toggle the filter on and off from your status bar without opening the app, or use the customizable widget for instant access while gaming or working. Resize the widget, adjust its opacity, and position it anywhere on your screen for maximum convenience. For users who want automated protection, the scheduling function lets you set specific times when the blue light filter activates automatically—perfect for your evening routine. When you adjust your screen brightness, the filter applies intelligently, creating a seamless experience that adapts to your needs.

Performance is built into every feature of sFilter - Blue Light Filter. The app uses minimal memory and battery power because only essential functions are included—no bloatware, no unnecessary background processes. By pairing blue light filtering with screen dimmer adjustment, you further reduce battery drain while protecting your vision. The app respects your device resources, making it an ideal long-term companion for daily use.

Customization puts you in control. Fine-tune filter opacity in your preferred measurement unit, set brightness adjustment limits, and choose which features to enable. Create shortcuts for quick activation, and use the all-process exit function to clear memory and fully disable the filter when needed. Every feature is optional, so you use only what matters to you.

All core functions—status bar controls, widgets, scheduling, and the full 18-color filter library—are completely free. No hidden costs, no premium tiers. Whether you're a night-time reader, late-night gamer, or someone who simply wants healthier screen habits, sFilter - Blue Light Filter delivers genuine eye protection without compromising your phone's performance.