Online Metronome with Subdivisions - Precise Rhythm Trainer
Play a metronome with adjustable BPM, time signature, and subdivisions (eighth, triplet, sixteenth). Tap tempo and visual flash. Works offline for practice.
UD5 Toolkit
Play a metronome with adjustable BPM, time signature, and subdivisions (eighth, triplet, sixteenth). Tap tempo and visual flash. Works offline for practice.
Enter any two variables (speed, distance, time) and get the third. Supports mph, km/h, m/s and multiple units. Practical for runners and drivers.
Track attendance for multiple subjects. Mark present/absent and see percentage. Data in localStorage. Simple student tool.
Enter two dates and see the exact number of days, weeks, and workdays between them. Also shows the countdown or days since.
Convert volumetric flow rate units: gallons per minute, liters per second, cubic meters per hour. Useful for plumbing and hydraulics.
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Stepโbyโstep demo.
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Set any future date and see a live countdown in days, hours, minutes, seconds. Fun animated display. Save multiple countdowns locally.
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Record feeding times, side (left/right for nursing) or oz for bottle. Track daily patterns. Data stays in your browser. Simple newborn helper.
Paste a robots.txt file and validate its syntax. See if a specific userโagent can access a path. Essential for webmasters.
Simple tracker to record potty attempts, successes, accidents. See patterns. Data stays local. Aids in toilet training journey.
Virtual flip coins thousands of times and see the heads/tails ratio converge to 50%. Interactive law of large numbers.
Combine TTS with text highlighting. See each word colored as it is spoken. For eโlearning content creation. Local.
Paste robots.txt content and parse it to check validity, find disallowed paths. Educational SEO tool. Local processing.
Tap a glass icon each time you drink a cup of water. See your daily intake. Reminders optional. Local storage.
Play an audio file or use mic to see realโtime frequency bars. Choose colors. Great for music videos. Canvas.
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
Test your browser's builtโin speech recognition. Speak and see the transcribed text appear live. Mustโhave for voice app devs.
Hear text spoken word by word with boundary events. See the exact index and character. Advanced TTS dev tool.
Convert pixel values to em and rem units based on a base font size. Bidirectional. Mustโhave for frontโend developers.
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Drag a virtual ruler across your screen to measure pixel distances. Horizontal and vertical guides. Useful for UI designers checking alignment.
Spin a colorful wheel that lands on Yes, No, or custom answers. Includes sound effects and adjustable probability. Local fun decision maker.
Compare :focus and :focusโvisible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.