Analyser Node Playground - Online Real‑Time Frequency & Waveform
Connect an audio source to an Analyzer Node and display frequency and time‑domain data. Learn Web Audio visualization.
UD5 Toolkit
Convert between min/km and min/mile, calculate pace, time, or distance instantly.
Connect an audio source to an Analyzer Node and display frequency and time‑domain data. Learn Web Audio visualization.
Drop an audio file and instantly see its duration in seconds and formatted time. Read metadata without full playback.
Read the ambient atmospheric pressure in hPa using the Pressure Sensor API (if available). Real‑time graph.
Use the Magnetometer API to build a digital compass. See magnetic field strength and heading in real time.
Pomodoro timer with built‑in lo‑fi music playlist (synthetic). Focus and rest cycles. No copyright music; generated tones.
Interactive piano showing typical vocal ranges from Bass to Soprano. Highlight your range. For choir members.
Select color bands to decode a resistor's value, tolerance, and temperature coefficient. Essential for anyone working with electronics hardware.
Load an audio file and see its spectrogram with frequency over time. Adjust resolution and color map. Discover hidden sounds.
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.
Register a periodic background sync with a minimum interval. See the registration state and tags. Keep content fresh.
Paste text to see a live letter frequency bar chart. Helps break substitution ciphers. All local analysis.
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.
Complete a series of visual pattern puzzles and get a fun estimated score. Purely for entertainment. No data collected.
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
Play a selection of local lo‑fi tracks (embedded). Simple UI with play/pause. No copyright issues. Stay focused.
Enter text and generate the corresponding Morse code audio beeps. Adjust speed and tone. Great for learning and practicing CW. No download.
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Choose a base color and see its complementary, split‑complementary, triadic, and tetradic harmonies. Copy palettes. Local.
Select HTTP method, set headers, and body. Send requests and see the full response. Lightweight Postman alternative.
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.
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Play a sweep from 20Hz to 20kHz. Test your speakers and your hearing. Simple and effective. Web Audio API.
Process audio faster than real‑time with OfflineAudioContext. Apply filters and export the result. Dev tool.
Trigger different vibration patterns on mobile devices. Test if your phone supports haptic feedback. Simple demo.
Apply lowpass, highpass, and reverb to an audio source. See frequency response. Create your own guitar pedal. All local.
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Hear a common bird song and choose the correct species from multiple choices. Ear training for birders.
Create experimental glitch noises by toggling virtual circuit bend points. No real electronics harmed. Fun noise toy.
Play a collection of retro 8‑bit synth pads and leads using your keyboard. Record sequences and export as WAV. Pure Web Audio API.
Route your microphone input through a chain of virtual effects (distortion, reverb, delay) using Web Audio API.