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.
UD5 Toolkit
Try different bend points & Short Circuit for wild sounds!
Click pads to connect circuit traces — combine multiple!
Hold down for extreme glitch burst!
Play a collection of retro 8‑bit synth pads and leads using your keyboard. Record sequences and export as WAV. Pure Web Audio API.
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Trigger different vibration patterns on mobile devices. Test if your phone supports haptic feedback. Simple demo.
Connect an audio source to an Analyzer Node and display frequency and time‑domain data. Learn Web Audio visualization.
Mix realistic rain sounds with optional thunder and wind. Adjust individual volumes to create the perfect sleep or study atmosphere.
Drag a battery, resistor, LED onto a grid and simulate current flow. Show Ohm's law in action.
Use your microphone to detect the dominant frequency of ambient sounds. Visualize the spectrum. Local Web Audio.
Mix multiple ambient sounds (rain, fireplace, coffee shop) to create your perfect productive background.
Mix white noise, pink noise, rain, thunder, wind, and cafe sounds. Individual volume, save presets. Relax or focus. All client‑side.
Load an audio file and see its spectrogram with frequency over time. Adjust resolution and color map. Discover hidden sounds.
Measure the integrated loudness of an audio file in LUFS and RMS. Check if your music meets streaming platform standards. Client‑side.
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Apply a fisheye or barrel distortion to your photo with adjustable strength. Simulate extreme wide angle.
Apply lowpass, highpass, and reverb to an audio source. See frequency response. Create your own guitar pedal. All local.
Process audio faster than real‑time with OfflineAudioContext. Apply filters and export the result. Dev tool.
Pomodoro timer with built‑in lo‑fi music playlist (synthetic). Focus and rest cycles. No copyright music; generated tones.
Simulate adaptive bitrate logic by switching between different quality video segments. See how ABR algorithms work.
Shift the pitch of any audio clip by semitones without affecting playback speed. Perfect for music transposition. Local Web Audio.
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
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.
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Record how many eggs your hens lay each day. Visual chart shows weekly trends, helping you spot drops in production that may signal health issues.
Change the viewport meta tag and see how a page would render at different device widths. Understand responsive basics.
Transform a panoramic photo into a tiny planet (stereographic projection). Drag to adjust orientation. Download.
Test the experimental Translation API to translate text between languages directly in the browser, without cloud calls. Check support and copy the JavaScript starter.
Measure your browser's GPU compute power using a simple WebGPU matrix multiplication. See raw FLOPS and compare with peers. Fully client‑side.
Play a selection of local lo‑fi tracks (embedded). Simple UI with play/pause. No copyright issues. Stay focused.
Override your browser's geolocation to any coordinates and test how your app responds. For development and privacy testing.
Select HTTP method, set headers, and body. Send requests and see the full response. Lightweight Postman alternative.
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.