Bird Call Identification Quiz – Online Listen & Match
Hear a common bird song and choose the correct species from multiple choices. Ear training for birders.
UD5 Toolkit
Pattern Recognition Test — Sharpen Your Mind
Test your pattern recognition skills with 10 engaging puzzles. Spot sequences, identify shapes, and apply logical reasoning — all under time pressure!
Hear a common bird song and choose the correct species from multiple choices. Ear training for birders.
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.
Enter text and generate the corresponding Morse code audio beeps. Adjust speed and tone. Great for learning and practicing CW. No download.
Paste text to see a live letter frequency bar chart. Helps break substitution ciphers. All local analysis.
Use the Magnetometer API to build a digital compass. See magnetic field strength and heading in real time.
Write a pattern and test it against URLs instantly. See which groups match. Learn the modern alternative to regex for routing. Works entirely in the browser.
Connect an audio source to an Analyzer Node and display frequency and time‑domain data. Learn Web Audio visualization.
Create experimental glitch noises by toggling virtual circuit bend points. No real electronics harmed. Fun noise toy.
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
Play a sweep from 20Hz to 20kHz. Test your speakers and your hearing. Simple and effective. Web Audio API.
Experiment with the experimental Prompt API and Summarization API right in your browser. See how the on‑device AI model responds. Requires Chrome with AI features enabled.
Select color bands to decode a resistor's value, tolerance, and temperature coefficient. Essential for anyone working with electronics hardware.
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Trigger different vibration patterns on mobile devices. Test if your phone supports haptic feedback. Simple demo.
Pomodoro timer with built‑in lo‑fi music playlist (synthetic). Focus and rest cycles. No copyright music; generated tones.
Choose a base color and see its complementary, split‑complementary, triadic, and tetradic harmonies. Copy palettes. Local.
Register a periodic background sync with a minimum interval. See the registration state and tags. Keep content fresh.
Convert between pace (min/km, min/mile) and speed (km/h, mph). Predict race finish times for 5k, 10k, half and full marathon based on a recent split. Works offline.
Play a collection of retro 8‑bit synth pads and leads using your keyboard. Record sequences and export as WAV. Pure Web Audio API.
Load an audio file and see its spectrogram with frequency over time. Adjust resolution and color map. Discover hidden sounds.
Select HTTP method, set headers, and body. Send requests and see the full response. Lightweight Postman alternative.
Play a selection of local lo‑fi tracks (embedded). Simple UI with play/pause. No copyright issues. Stay focused.
Change the viewport meta tag and see how a page would render at different device widths. Understand responsive basics.
Apply lowpass, highpass, and reverb to an audio source. See frequency response. Create your own guitar pedal. All local.
Route your microphone input through a chain of virtual effects (distortion, reverb, delay) using Web Audio API.
Read the ambient atmospheric pressure in hPa using the Pressure Sensor API (if available). Real‑time graph.
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Select functional groups to see an approximate IR absorption spectrum. Learn spectroscopy visually. All local.
Mix multiple ambient sounds (rain, fireplace, cafe, forest) at different volumes. Create your perfect background noise. Local loops.
Mix white noise, pink noise, rain, thunder, wind, and cafe sounds. Individual volume, save presets. Relax or focus. All client‑side.