UD5 Toolkit
Pomodoro Playlist Linker – Attach a Lo‑Fi Playlist to Each Timer
Set a custom YouTube or Spotify playlist URL that auto‑plays when your focus session starts and pauses on breaks. Combine productivity with your favorite tunes.
Random Color Flash
Meditation & Focus Light · Relax your mind with gentle color pulses
Click Start to begin the color journey
Frequently Asked Questions
It’s a free online tool for meditation, relaxation, and focus. The gentle changing colors can help calm your mind, reduce stress, or even support mindfulness practices like Trataka (candle gazing).
Different colors evoke different emotions and energies. Soft, slowly changing colors can lower heart rate, enhance present-moment awareness, and create a peaceful environment for deep meditation.
Yes! Some people use a gentle flashing light to maintain visual attention during focus sessions. Adjust the frequency and turn on Soft Mode for a non-distracting background light.
⚠️ Caution: Flashing lights may trigger seizures in people with photosensitive epilepsy. The default settings are gentle, but if you are sensitive, please consult a doctor before use. Keep the frequency slow and avoid high‑contrast flashes.
Use the Frequency slider to set how often the color changes (0.5s to 10s) and the Transition slider to control the blending speed between colors.
Absolutely! The tool is fully responsive and works on all modern smartphones and tablets. The fullscreen mode even hides browser controls for an immersive experience.
It uses simple CSS transitions and a low‑frequency timer, so battery impact is minimal. However, keeping the screen on for long periods will consume power normally.
No, this is a silent visual tool. For a multi‑sensory experience, you can combine it with your own meditation music or nature sounds.
Rabbit Color Genetics Calculator – Online Predict Kit Colors
Select parent colors and genotypes to predict possible offspring coat colors. Based on simple Mendelian genetics for common breeds.
LEGO Color Chart & Hex Reference – Online BrickLink Colors
Browse all official LEGO colors with names, years, and hex codes. Sort by hue. Perfect for builders.
Ambient Focus Sound Mixer – Online Rain, Fire, Cafe, Waves
Mix multiple ambient sounds (rain, fireplace, coffee shop) to create your perfect productive background.
Paint Color Visualizer – Online Test Wall Colors on Sample Rooms
Simulate paint colors on a pre-loaded room photo by adjusting hue, saturation. Find your perfect shade before buying. Local canvas.
Material Design 3 Color Generator - Online Dynamic Tonal Palettes
Pick a source color and generate a complete M3 tonal palette with light/dark schemes. Export as CSS custom properties.
Relative Luminance Calculator - Online WCAG Metrics
Enter a hex color and get its relative luminance per WCAG definition. Understand why this matters for contrast.
CIELAB to RGB Converter - Online Bring Color Back
Enter L*a*b* values and see the corresponding RGB and hex color. Useful for advanced color manipulation.
HSV Color Picker - Online Traditional Hue Wheel
Classic HSV color wheel with sliders. See hex, RGB, and HSL equivalents. Intuitive for artists. No server interaction.
Image Hue Shifter - Online Change Colors Easily
Rotate the hue of any image globally. Turn a red car blue instantly. Download the result. Works entirely in the browser.
Random Color Naming Challenge - Online Eye Test
See a random color and type its name. Score based on accuracy. Fun for designers. Local.
Color to CIELAB Converter - Online Perceptual Space
Convert hex or RGB to CIELAB L*a*b* values. Understand perceptual lightness and color opponents. Local math.
3D RGB Color Cube - Online Interactive Space
Explore the RGB color space as a rotatable 3D cube. Pick a color directly from the volume. Drag to rotate. Canvas 3D.
Image Color Picker From URL - Online Remote Picture Analyzer
Enter the URL of any online image and extract its dominant colors or pick colors with a magnifier. No upload, cross‑origin friendly.
Color Image to ASCII Art - Online True Color Converter
Convert any image into colored ASCII art using divs with background colors. Creates a stunning text‑based replica. View & copy HTML.
Smoothie Recipe by Color - Online Get Green or Pink
Want a green smoothie? Pick a color and get a simple healthy recipe. Detox, protein, or fruit.
Cocktail Recipe by Color - Online Pick Your Hue
Select a color and see which cocktails match it roughly. Blue for Blue Lagoon, red for Negroni. Fun bar guide.
Weekly Focus Planner - Online One Page Goal Sheet
Set three big tasks for the week, top priority, habit trackers, and notes. Print or screenshot. Minimalist.
Virtual Flashlight - Online Color & Strobe Screen
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Random Tattoo Idea Generator - Online Flash Sheet Picker
Get a random tattoo concept with style and placement suggestion. For fun and inspiration only. Not real art.
Image Color Histogram - Online RGB Channel Graph
Upload an image and see its RGB and luminance histograms. Understand exposure and color distribution. Photographer tool.
CMYK Color Preview - Online See Print vs Screen
Preview how a CMYK value will look on screen (approximate). Compare with its RGB equivalent. Pre‑press check.
Focus Order Analyzer - Online Tab Navigation Check
Enter a URL and extract tab‐index order violations and focusable elements. Quick accessibility audit. Client‑side fetch.
Meditation Bell Timer - Online Interval Singing Bowl
Set a meditation session with singing bowl sounds at start, interval chimes, and end bell. No ads, pure serenity.
Color to Pitch Synaesthesia - Online Hear a Hex Code
Enter a hex color and hear a tone mapped to its hue. Explore the connection between color and sound. Fun perceptual experiment.
Color Inversion Calculator - Online Exact Opposite Hue
Get the exact RGB inversion (negative) of any color. Useful for dark mode theming and high‑contrast accessibility checks.
Pomodoro Timer with Lo‑Fi Music - Online Focus Beats
Pomodoro timer with built‑in lo‑fi music playlist (synthetic). Focus and rest cycles. No copyright music; generated tones.
Pigment Mixing Simulator - Online Color Blending Tool
Mix two or more colors using subtractive (CMYK‑like) blending. See what happens when you combine real paints. Brush effect canvas.
Pomodoro Task List - Online Focus Timer with To-Do
Combine a Pomodoro timer with a simple task list. Assign estimated Pomodoros to tasks and track completions. Boost focus and get things done.
Pomodoro Timer - Online Focus & Productivity Countdown
Boost your productivity with the Pomodoro technique. Customizable work and break intervals with desktop notifications. Simple, clean, and works offline.