LoβFi Music Player - Online Focus & Study Beats
Play a selection of local loβfi tracks (embedded). Simple UI with play/pause. No copyright issues. Stay focused.
UD5 Toolkit
Play a selection of local loβfi tracks (embedded). Simple UI with play/pause. No copyright issues. Stay focused.
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Mix multiple ambient sounds (rain, fireplace, cafe, forest) at different volumes. Create your perfect background noise. Local loops.
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
Enter text and generate the corresponding Morse code audio beeps. Adjust speed and tone. Great for learning and practicing CW. No download.
Mix white noise, pink noise, rain, thunder, wind, and cafe sounds. Individual volume, save presets. Relax or focus. All clientβside.
Process audio faster than realβtime with OfflineAudioContext. Apply filters and export the result. Dev tool.
Load an audio file and see its spectrogram with frequency over time. Adjust resolution and color map. Discover hidden sounds.
Drop an audio file and instantly see its duration in seconds and formatted time. Read metadata without full playback.
Connect an audio source to an Analyzer Node and display frequency and timeβdomain data. Learn Web Audio visualization.
Play a collection of retro 8βbit synth pads and leads using your keyboard. Record sequences and export as WAV. Pure Web Audio API.
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.
Interactive piano showing typical vocal ranges from Bass to Soprano. Highlight your range. For choir members.
Route your microphone input through a chain of virtual effects (distortion, reverb, delay) using Web Audio API.
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.
Play a sweep from 20Hz to 20kHz. Test your speakers and your hearing. Simple and effective. Web Audio API.
Apply lowpass, highpass, and reverb to an audio source. See frequency response. Create your own guitar pedal. All local.
Hear a common bird song and choose the correct species from multiple choices. Ear training for birders.
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Choose a base color and see its complementary, splitβcomplementary, triadic, and tetradic harmonies. Copy palettes. Local.
Use the Magnetometer API to build a digital compass. See magnetic field strength and heading in real time.
Trigger different vibration patterns on mobile devices. Test if your phone supports haptic feedback. Simple demo.
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Select color bands to decode a resistor's value, tolerance, and temperature coefficient. Essential for anyone working with electronics hardware.
Read the ambient atmospheric pressure in hPa using the Pressure Sensor API (if available). Realβtime graph.
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.
Change the viewport meta tag and see how a page would render at different device widths. Understand responsive basics.
Create experimental glitch noises by toggling virtual circuit bend points. No real electronics harmed. Fun noise toy.
Complete a series of visual pattern puzzles and get a fun estimated score. Purely for entertainment. No data collected.