UD5 Toolkit
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.
Web Audio Filter Chain - Online Biquad & Convolver
Web Audio Filter Chain
Biquad Filters + Convolution ReverbAudio Source
Drop audio file or click to browse
WAV, MP3, OGG, FLAC supported
No file loaded
Playback & Output
Frequency Response
Theoretical (Biquad)
Real-time Spectrum
Biquad Filter Chain (0 filters)
No filters yet. Click "Add Filter" to start shaping your sound.
Convolution Reverb
Small Room
Medium Hall
Large Hall
Cathedral
Spring
Speaker Frequency Sweep - Online Audio Test & Ear Check
Play a sweep from 20Hz to 20kHz. Test your speakers and your hearing. Simple and effective. Web Audio API.
OfflineAudioContext Demo - Online Render Audio Fast
Process audio faster than real‑time with OfflineAudioContext. Apply filters and export the result. Dev tool.
Online Spectrogram Viewer - Audio Frequency Visualizer
Load an audio file and see its spectrogram with frequency over time. Adjust resolution and color map. Discover hidden sounds.
Color Harmony Picker - Online Complementary Split‑Comp
Choose a base color and see its complementary, split‑complementary, triadic, and tetradic harmonies. Copy palettes. Local.
Voice Pitch Chart - Online Soprano to Bass Reference
Interactive piano showing typical vocal ranges from Bass to Soprano. Highlight your range. For choir members.
Guitar Effect Chain Simulator - Online Virtual Pedalboard
Route your microphone input through a chain of virtual effects (distortion, reverb, delay) using Web Audio API.
HTTP Request Composer - Online Build & Send Requests
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Letter Frequency Analyzer - Online ETAOIN SHRDLU
Paste text to see a live letter frequency bar chart. Helps break substitution ciphers. All local analysis.
Audio Duration Viewer - Online Get Length Without Player
Drop an audio file and instantly see its duration in seconds and formatted time. Read metadata without full playback.
Resistor Color Code Calculator - Online Band to Value
Select color bands to decode a resistor's value, tolerance, and temperature coefficient. Essential for anyone working with electronics hardware.
Lo‑Fi Music Player - Online Focus & Study Beats
Play a selection of local lo‑fi tracks (embedded). Simple UI with play/pause. No copyright issues. Stay focused.
Pomodoro Timer with Lo‑Fi Music - Online Focus Beats
Pomodoro timer with built‑in lo‑fi music playlist (synthetic). Focus and rest cycles. No copyright music; generated tones.
Advanced Ambient Noise Mixer - Online Rain, Wind & Cafe
Mix white noise, pink noise, rain, thunder, wind, and cafe sounds. Individual volume, save presets. Relax or focus. All client‑side.
Ambient Sound Mixer - Online Rain, Fire & Coffee Shop
Mix multiple ambient sounds (rain, fireplace, cafe, forest) at different volumes. Create your perfect background noise. Local loops.
Monophonic Synth - Online Play with Oscillator & Envelope
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Morse Code Audio Player - Online CW Practice & Play
Enter text and generate the corresponding Morse code audio beeps. Adjust speed and tone. Great for learning and practicing CW. No download.
Electromagnetic Spectrum Explorer - Online Wavelengths
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Circuit Bending Simulator - Online Glitch Sound Generator
Create experimental glitch noises by toggling virtual circuit bend points. No real electronics harmed. Fun noise toy.
URLPattern API Tester - Online Route Matcher & Playground
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.
Bird Call Identification Quiz – Online Listen & Match
Hear a common bird song and choose the correct species from multiple choices. Ear training for birders.
Periodic Background Sync Demo - Online PWA Feature
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
API Request Builder - Online Test REST Endpoints
Select HTTP method, set headers, and body. Send requests and see the full response. Lightweight Postman alternative.
Periodic Background Sync Registration - Online PWA Tool
Register a periodic background sync with a minimum interval. See the registration state and tags. Keep content fresh.
Vibration API Demo - Online Test Haptic Feedback
Trigger different vibration patterns on mobile devices. Test if your phone supports haptic feedback. Simple demo.
Ambient Pressure Sensor Demo - Online Barometer
Read the ambient atmospheric pressure in hPa using the Pressure Sensor API (if available). Real‑time graph.
Retro Synth Pad - Online 8‑bit Sound Generator
Play a collection of retro 8‑bit synth pads and leads using your keyboard. Record sequences and export as WAV. Pure Web Audio API.
Built-in AI API Playground - Online Test Chrome's Gemini Nano
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.
Fun IQ Puzzle Challenge - Online Pattern Recognition Test
Complete a series of visual pattern puzzles and get a fun estimated score. Purely for entertainment. No data collected.
Magnetometer Demo - Online Digital Compass
Use the Magnetometer API to build a digital compass. See magnetic field strength and heading in real time.