I built DynamicScreen, a free web-based tool for generating dynamic screen colors and lighting effects. No signup or download required.

What it does: - Creates dynamic color backgrounds for live streaming - Provides ambient lighting for work/focus sessions - Generates relaxation/mood lighting effects

5 core modes: • Hard Cut – instant color switching for parties and beats • Fade – smooth color transitions for relaxation • Flash – high-frequency strobe effects • Breathing – gentle brightness cycles for meditation/sleep • Solid Color – static ambient lighting with filters

15 preset lighting effects: - Time-based: Day/night cycle, dusk, dawn - Seasonal: Spring, summer, autumn, winter themes - Holiday: Christmas, Halloween, New Year - Nature: Ocean waves, forest breeze, sunset glow - Mood: Deep focus, total relaxation

Features: - 60 preset colors + custom color picker - Adjustable speed, frequency, and brightness - Works offline after first load - 25 languages supported - Fullscreen mode with floating controls

Demo: https://dynamicscreen.online

Would love feedback from the HN community – especially on what features or effects would be most useful for your use cases.