Electronics & Hardware tools
Test keyboards, mics, webcams, gamepads, and screens, tune instruments, and size wiring, batteries, solar, and AV setups.
Estimate battery runtime from capacity, voltage, and load, with depth-of-discharge and efficiency factors.
Check any monitor, laptop, TV or phone screen for dead and stuck pixels with fullscreen solid colours, then try to revive a stuck pixel with a flashing fixer.
Test any game controller in the browser: live button states, analog values, stick plots, and a vibration check.
Add up appliance running and surge watts from an editable checklist to get a recommended generator size.
Tune a guitar, bass, ukulele, violin or any instrument with your microphone.
Test every key on your keyboard online.
Calculate the current-limiting resistor for LEDs: exact ohms, nearest standard E24 value, and power rating.
A rock-steady online metronome from 20 to 300 BPM with tap tempo, time signatures, an accented first beat, subdivisions, and a visual beat indicator.
Test your microphone online: live dBFS level meter, waveform, spectrum, clipping check, and record-and-play-back.
Enter any two of voltage, current, resistance, and power to solve the other two instantly with Ohm's law.
Solve projector throw distance, image width, or throw ratio from the other two, with screen-diagonal helpers.
Find out what refresh rate your monitor is really running at, with frame-time jitter, dropped frames, and a moving-object motion test.
Calculate pixels per inch, dot pitch, and aspect ratio from a screen's resolution and diagonal size.
Size an off-grid battery bank from daily kWh, days of autonomy, voltage, depth of discharge, and inverter efficiency.
Size a solar array from daily kWh usage (or your electric bill), peak sun hours, panel wattage, and losses.
Calculate speaker enclosure volume from internal dimensions, minus driver displacement, plus ported-box port length.
Play a pure tone at any frequency from 1 Hz to 22 kHz: sine, square, sawtooth or triangle, frequency sweeps, white, pink and brown noise, and a left/right speaker test.
Drag across a grid to reveal touchscreen dead zones, with live multi-touch tracking and per-finger coordinates.
Find the ideal TV size for your seating distance (or vice versa) using THX, SMPTE, and 1080p guidelines.
Estimate UPS backup runtime in minutes from battery watt-hours (or VAh × power factor), load, and inverter efficiency.
Calculate voltage drop over a wire run from AWG gauge, length, current, and circuit type, with a 3% warning.
Test your webcam online: live preview, real resolution and measured frame rate, supported-resolution probe, and PNG snapshots.
Find the minimum AWG wire gauge that meets both your voltage-drop limit and standard ampacity ratings.
About Electronics & Hardware tools
A mix of interactive hardware testers and electrical sizing calculators. The testers use your browser's own device APIs: plug in a game controller and see live button states, analog stick plots, and a vibration check; press every key to find dead switches, ghosting, and chatter; watch a microphone's live level and play back a recording; measure the resolution and frame rate a webcam really delivers; or drag across a grid to reveal a touchscreen's dead zones with per-finger multi-touch tracking. Display tests cycle fullscreen colours to find dead and stuck pixels and measure the refresh rate your monitor really runs at, while the audio tools — a chromatic tuner, a metronome with tap tempo, and a tone and noise generator — turn your mic and speakers into music and test gear. No downloads or drivers — if the browser can see the device, the tester can exercise it.
The electrical calculators cover the math behind safe, correctly sized circuits and off-grid setups: Ohm's law from any two known values, voltage drop over a wire run by AWG gauge, minimum wire size that satisfies both drop limits and ampacity, LED current-limiting resistors with nearest standard values, battery and UPS runtime, generator wattage from an appliance checklist, and solar array and battery bank sizing from your actual daily usage.
Rounding things out are home-theater and display calculators — ideal TV size for a seating distance using THX and SMPTE guidelines, projector throw distance, screen PPI, and speaker enclosure volume. The sizing tools follow standard engineering formulas and are great for planning and sanity checks, but for mains wiring, verify results against your local electrical code or an electrician. Everything runs locally in your browser.