UD5 Toolkit
Countdown Timer with Laps - Online Workout & Study
Run a countdown timer that automatically repeats for a set number of laps. Great for HIIT, study sprints, or any interval work.
Online Alarm Clock - Set & Wake with Sound
No alarm set
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Set Your Alarm
Classic
Digital
Melodic
Buzzer
Frequently Asked Questions
How does the online alarm clock work?
Our online alarm clock uses your device's local time and plays a sound through your browser when the set time is reached. Simply choose your alarm time, pick a ringtone, and click "Set Alarm." Keep the browser tab open for the alarm to trigger. You can use the snooze function to delay the alarm by 9 minutes.
Will the alarm work if my computer is locked or in sleep mode?
No. The alarm requires your browser tab to remain open and your device to stay awake. If your computer enters sleep mode or the browser tab is closed, the alarm will not sound. We recommend keeping your device awake and the tab active for reliable alarm functionality.
Do I need to allow sound permissions?
Modern browsers may require a user interaction (like clicking a button) before playing audio. When you click "Set Alarm" or "Test Sound," this grants the necessary audio permission. If the alarm fails to produce sound, try interacting with the page first.
Can I use this alarm clock on my mobile phone?
Absolutely! This alarm clock is fully responsive and works on all modern smartphones and tablets. For best results, keep the browser tab open and your phone's screen on. You can also add this page to your home screen for quick access.
What ringtones are available?
We offer four distinct ringtone styles: Classic (traditional alarm beep), Digital (fast electronic pulse), Melodic (gentle alternating tones), and Buzzer (urgent sweeping frequency). You can preview each sound using the "Test Sound" button before setting your alarm.
How does the snooze function work?
When the alarm rings, clicking "Snooze" will silence it for exactly 9 minutes — the classic snooze duration. After 9 minutes, the alarm will sound again. You can snooze multiple times. Click "STOP" to fully deactivate the alarm.
Is my privacy protected when using this tool?
Yes! Everything runs locally in your browser. We do not collect, store, or transmit any personal data. The alarm time, sound preferences, and all settings remain on your device. No account or registration is required.
Online Audio Reverb Tool - Add Room Ambience
Add artificial reverb to an audio recording. Choose from small room to large hall. Wet/dry mix. Convolution‑based.
Retro Clock Widget - Online Fullscreen Nixie or Flip Clock
Display a stylish retro flip clock or Nixie tube clock in full screen. Perfect for desk presentation or decoration. Pure CSS and JS.
Binary Clock - Online Real‑Time Time in BCD
View the current time in binary (BCD) format. A stylish geek clock with dot columns. Toggle between binary and decimal labels.
Live Binary Clock - Online Hex & Decimal Time
See the current time displayed in binary and hexadecimal. Dark theme, full‑screen mode. A geeky desk decoration.
Memory Sequence Game - Online Watch & Repeat Colors
Watch a color sequence and click the same pattern. Gets longer each round. Test and improve your working memory. All local.
Image Gradient Overlay - Online Add Color Tint
Apply a customizable gradient overlay to any image. Perfect for banners and social media. Download the result. Local.
Scan Barcode from Camera - Online Live UPC/EAN Reader
Point your camera at a barcode and decode it live. Works with multiple formats. Pure JavaScript barcode detection.
Online Hash Generator - MD5 SHA1 SHA256 CRC32 Checksum
Generate cryptographic and checksum hashes for any text string. Supports MD5, SHA-1, SHA-256, and CRC32. All hashing runs locally for maximum privacy.
Screenshot Color Picker - Online Upload & Pick Hex
Upload a screenshot or image and use the magnifying glass to pick exact colors. Get hex, RGB, and HSL. Simple.
Color to Tailwind Class Converter - Online Map Hex to closest
Enter any hex color and find the nearest Tailwind CSS color class. Also shows the Tailwind palette shade.
HEX to HSL Converter - Online Color Code to Hue Saturation Lightness
Translate HEX colors to HSL values and adjust lightness and saturation visually. Great for creating color variations in CSS design systems.
Roman Numeral Arithmetic - Online Add & Subtract
Enter two Roman numerals and add or subtract them. See the result in Roman and Arabic. A fun mental workout.
WebGPU Shader Playground - Online WGSL Editor
Write a compute shader in WGSL and run it in the browser. See the output on a canvas. Learn WebGPU. Real‑time compilation.
Image Blend Mode Tester - Online Overlay Two Photos
Upload two images and apply CSS blend modes (multiply, screen, overlay, etc.). See the result and copy the filter CSS. Pure frontend.
Iron Absorption Optimizer – Online Timing & Food Pairing
Schedule your iron supplement away from inhibitors (coffee, calcium). Visual reminder and log.
Emoji Countdown Timer – Online Animated Pizza/Smiley Alarm
Set a short timer with a themed emoji animation (e.g., pizza cooking). A playful visual countdown.
Sunburn Risk Timer - Online UV Index to Safe Exposure
Enter skin type and UV index to estimate time to sunburn. Visual countdown reminder to reapply sunscreen or seek shade. Educational only.
Breathing Exercise Timer - Online Inhale Hold Exhale Visual Guide
Animated circle guides your breathing: breathe in, hold, breathe out. Customizable ratios (e.g., 4-7-8). Soothing colors, optional bell sound. Purely local.
Tea Brewing Timer - Online Perfect Steep for Green Black Oolong
Select tea type and get recommended steeping time & temperature. Start a visual countdown with an alert. Make every cup perfect. No ads, local.
Breathing Exercise Timer - Online Box Breathing & 4-7-8 Guide
Guided breathing exercises with animated circle for inhale/hold/exhale. Includes box breathing, 4-7-8, and resonant breathing patterns. Customizable intervals.
Meditation Chime Timer - Online Mindfulness Bell
Set a meditation duration with optional interval chimes. Soothing bell sounds at the start and end. No ads.
Sleep Cycle & REM Calculator - Online Best Bedtimes
Find the optimal go‑to‑sleep or wake‑up times based on 90‑min sleep cycles. Wake up between REM cycles and feel refreshed.
Multi‑Stopwatch Page - Online Track Many Tasks
Run up to 4 independent stopwatches at once with labels. Perfect for timing multiple tasks or sprints.
Digital Binary Clock - Online Time in Bits Fullscreen
A beautiful full‑screen binary clock showing hours, minutes, seconds in glowing bits. Dark mode perfect for desks.
Coding Interview Timer - Online LeetCode Practice Clock
Set a 20, 30, or 45‑minute countdown to simulate a technical interview. Hidden/unhidden. Boost your prep.
Digital Hourglass - Online Visual Timer with Sand
An animated hourglass that you can set for any time. Watch the sand flow. Beautiful and calming timer.
Pomodoro Task Planner - Online Work Sessions & To‑Do List
Combine a Pomodoro timer with a built‑in to‑do list. Estimate pomodoros per task, track completed sessions, and see daily progress. All data stored locally.
Posture Reminder Timer - Online Sit Up Straight Alert
Set a recurring timer that reminds you to check your posture. Desktop notification with a gentle chime. Stay healthy.
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.