Reading comfort is personal. What works for one person might strain another’s eyes. That’s why Lion Reader gives you comprehensive control over how your content appears, letting you create the perfect reading environment for your preferences and lighting conditions.

Dark Mode

Full dark mode support comes powered by next-themes. You can follow your system’s light/dark preference or manually toggle between modes. Every component, from the sidebar to article content, adapts seamlessly to your chosen theme.

Sleep-friendly dark mode

Lion Reader’s dark theme is designed for late-night reading. Rather than the usual blue-accented dark mode, it deliberately minimizes blue light: the accent color switches from blue to a warm red (red-400, #f87171), and informational highlights use neutral zinc grays (zinc-400, #a1a1aa) instead of blue. In light mode those same elements stay blue, where blue light is a non-issue in a bright environment.

The motivation is simple: blue light in the evening is the wavelength most associated with suppressing melatonin, the hormone that helps you wind down for sleep. By steering the dark theme toward warm and neutral tones, Lion Reader aims to be gentler on your eyes and your circadian rhythm when you’re reading in bed with the lights off. This is a design choice to reduce blue light, not a medical claim — but if you read at night, it’s one less thing keeping you awake.

Typography Controls

Fine-tune your reading experience with multiple font families to choose from:

• System — Uses your operating system’s default font
• Serif options — Merriweather and Literata for traditional book-like reading
• Sans-serif options — Inter and Source Sans for modern, clean typography

Text size options range from small to extra-large, with responsive scaling across all screen sizes. Choose left-aligned or justified text alignment based on your preference. All settings save locally and apply instantly as you adjust them.

Progressive Web App

Lion Reader is a Progressive Web App, which means you can install it on your desktop or mobile device for a native app-like experience. On mobile, the app locks to portrait orientation for optimal reading comfort. The demo page you’re viewing right now showcases the reading experience with all these customization options available.