Stopwatch & Countdown Timer - Online Dual Tool
Dual-function tool: a precise stopwatch with laps and a configurable countdown timer with alarm sound. Works offline, perfect for activities.
UD5 Toolkit
Online Visual Timer with Flowing Sand Animation
Dual-function tool: a precise stopwatch with laps and a configurable countdown timer with alarm sound. Works offline, perfect for activities.
Drag pie slices to represent fractions and see them added together. Great for visual learners.
Set timer for incubation period with temperature guide. Track hours for optimal tanginess. Homemade yogurt.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Set a short timer with a themed emoji animation (e.g., pizza cooking). A playful visual countdown.
Set interval reminders to reapply sunscreen every 2 hours (or custom) with sound and notification. Protect kids' skin.
Set a nap timer with optional gentle white noise or lullabies (Web Audio). Reminder to put baby down. Fully local, no ads.
Enter skin type and UV index to estimate time to sunburn. Visual countdown reminder to reapply sunscreen or seek shade. Educational only.
Calculate required bags of cement, sand, and gravel for a given concrete volume using standard mix ratios (1:2:4, etc.). Supports metric and imperial.
Set recurring audio/visual reminders to check and correct sitting posture. Adjustable interval and notification style. Helps reduce back pain from desk work.
Add rows and columns, merge cells, and set gaps visually. Get the grid‑template CSS and HTML. Fast layout prototyping.
Connect oscillators, gain nodes, and filters with a visual graph. Hear the result in real time. Learn Web Audio interactively.
Enter text and see each character's 8‑bit binary laid out in a black‑and‑white grid. Beautiful data art. Local.
Build a simple decision tree by adding yes/no nodes. Flowchart style. Export as text outline.
Enter a number and see its Collatz sequence graphed. Watch the steps until it reaches 1. Mesmerizing math.
Press any key and see it light up on a standard QWERTY layout. Check functionality or demonstrate shortcuts.
Set a 20, 30, or 45‑minute countdown to simulate a technical interview. Hidden/unhidden. Boost your prep.
Set a cron expression and see a calendar of the next 1,000 execution times. Never miss a schedule again.
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.
Set a recurring timer that reminds you to check your posture. Desktop notification with a gentle chime. Stay healthy.
Set a meditation session with singing bowl sounds at start, interval chimes, and end bell. No ads, pure serenity.
Build a GraphQL query by selecting fields and nesting visually. Copy the built query string. For learning and fast prototyping.
Set an alarm that rings at a specific time even if the tab is in background. Multiple alarm tones. Works offline.
Create simple 2‑ or 3‑set Venn diagrams by entering comma‑separated lists. Shareable via URL fragment. No account.
Pick your egg style and get a precise timer with visual progress. Perfect boiled eggs every time. No app needed.
Choose your tea type and start a precise steeping timer with color‑changing background. Never over‑steep again.
Set a timer that reminds you to take a break, stretch, or follow the 20‑20‑20 rule. Desktop notification supported. Runs offline.
Create a personal countdown to any future date (birthday, vacation, launch). Shows days, hours, minutes, seconds. Locally stored.
Accurate online stopwatch with lap and split time capabilities. Start, pause, and reset. Ideal for sports and presentations. Runs natively in the browser.
Boost your productivity with the Pomodoro technique. Customizable work and break intervals with desktop notifications. Simple, clean, and works offline.