Online Metronome - Precise Beats per Minute & Time Signature
A precise online metronome with adjustable BPM, beat emphasis, and time signature. Works offline. Essential for musicians.
UD5 Toolkit
A precise online metronome with adjustable BPM, beat emphasis, and time signature. Works offline. Essential for musicians.
Spin a colorful wheel that lands on Yes, No, or custom answers. Includes sound effects and adjustable probability. Local fun decision maker.
Record feeding times, side (left/right for nursing) or oz for bottle. Track daily patterns. Data stays in your browser. Simple newborn helper.
Track attendance for multiple subjects. Mark present/absent and see percentage. Data in localStorage. Simple student tool.
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
Convert volumetric flow rate units: gallons per minute, liters per second, cubic meters per hour. Useful for plumbing and hydraulics.
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.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Virtual flip coins thousands of times and see the heads/tails ratio converge to 50%. Interactive law of large numbers.
Play an audio file or use mic to see realβtime frequency bars. Choose colors. Great for music videos. Canvas.
Set watering schedules for multiple plants with visual alerts. Shows which plants need water today based on last watered date. Data stored locally.
Simple tracker to record potty attempts, successes, accidents. See patterns. Data stays local. Aids in toilet training journey.
Enter two dates and see the exact number of days, weeks, and workdays between them. Also shows the countdown or days since.
Set any future date and see a live countdown in days, hours, minutes, seconds. Fun animated display. Save multiple countdowns locally.
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.
Convert pixel values to em and rem units based on a base font size. Bidirectional. Mustβhave for frontβend developers.
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.
Generate a Lit Element web component skeleton with styles and properties. Copy and start coding immediately.
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Stepβbyβstep demo.
Tap a glass icon each time you drink a cup of water. See your daily intake. Reminders optional. Local storage.
Paste a robots.txt file and validate its syntax. See if a specific userβagent can access a path. Essential for webmasters.
Change the text input cursor color. See the effect live. Copy the minimal CSS. Simple but delightful.
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Test your browser's builtβin speech recognition. Speak and see the transcribed text appear live. Mustβhave for voice app devs.
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
Find the centroid (center of mass) of any convex polygon by entering vertex coordinates. Useful for physics and design.
Convert pixel values to viewportβrelative units (vw, vh, vmax, vmin) for a specified breakpoint. Includes DVH and SVH. Essential for fluid layouts.
Paste robots.txt content and parse it to check validity, find disallowed paths. Educational SEO tool. Local processing.