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.
UD5 Toolkit
Online Focus & Study Beats — Relax, Concentrate, Create
Now Playing
70 BPM · Chill Beat
Ambience Presets
Learn more about Lo‑Fi music and how it enhances focus
Pomodoro timer with built‑in lo‑fi music playlist (synthetic). Focus and rest cycles. No copyright music; generated tones.
Play a simple monophonic synthesizer with your keyboard. Choose waveform, attack, decay, and filter. For music fun.
Mix multiple ambient sounds (rain, fireplace, coffee shop) to create your perfect productive background.
Connect an audio source to an Analyzer Node and display frequency and time‑domain data. Learn Web Audio visualization.
Measure the integrated loudness of an audio file in LUFS and RMS. Check if your music meets streaming platform standards. Client‑side.
Record daily systolic/diastolic readings and pulse. See a trend chart. All data saved locally in your browser.
Process audio faster than real‑time with OfflineAudioContext. Apply filters and export the result. Dev tool.
Apply lowpass, highpass, and reverb to an audio source. See frequency response. Create your own guitar pedal. All local.
Load an audio file and see its spectrogram with frequency over time. Adjust resolution and color map. Discover hidden sounds.
Use your microphone to detect the dominant frequency of ambient sounds. Visualize the spectrum. Local Web Audio.
Shift the pitch of any audio clip by semitones without affecting playback speed. Perfect for music transposition. Local Web Audio.
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Mix white noise, pink noise, rain, thunder, wind, and cafe sounds. Individual volume, save presets. Relax or focus. All client‑side.
Register a periodic background sync to fetch fresh data even when the tab is closed. Understand the API and limits.
Play a collection of retro 8‑bit synth pads and leads using your keyboard. Record sequences and export as WAV. Pure Web Audio API.
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Register a one‑off background sync and see it fire when connectivity returns. Debug service worker sync logic.
Change the viewport meta tag and see how a page would render at different device widths. Understand responsive basics.
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.
Use the Magnetometer API to build a digital compass. See magnetic field strength and heading in real time.
Simulate adaptive bitrate logic by switching between different quality video segments. See how ABR algorithms work.
Trigger different vibration patterns on mobile devices. Test if your phone supports haptic feedback. Simple demo.
Calculate correct aperture or distance for manual flash using the guide number formula. Input any two of GN, f‑stop, or distance to find the third. Perfect for studio and event photographers.
Test the experimental Translation API to translate text between languages directly in the browser, without cloud calls. Check support and copy the JavaScript starter.
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.
Mix realistic rain sounds with optional thunder and wind. Adjust individual volumes to create the perfect sleep or study atmosphere.
Override your browser's geolocation to any coordinates and test how your app responds. For development and privacy testing.
Find your public IP address and view approximate geolocation, ISP, and browser header details. No personal data stored. Static and instant.
Measure your browser's GPU compute power using a simple WebGPU matrix multiplication. See raw FLOPS and compare with peers. Fully client‑side.
Read the ambient atmospheric pressure in hPa using the Pressure Sensor API (if available). Real‑time graph.