Hardware Tools

Read and write NFC tags directly from browser using Web NFC API. Create smart business cards and automation triggers.

Test and map game controllers using Gamepad API. Visual button mapping, analog stick calibration, and vibration testing.

View detailed information about connected USB devices using WebUSB API.

Test your webcam and microphone in-browser. Live video preview, resolution, FPS, and audio level meter.

Test your screen for dead or stuck pixels with full-screen colors, gradients, and gray sweeps — right in your browser.

Measure ambient sound level in dB via your microphone with a live level meter, peak/average stats, and SPL estimation.

Free online voltage divider calculator. Compute Vout from Vin, R1, and R2 with current and power, model loaded dividers, and reverse-solve R2 for a target voltage.

Free online voltage drop calculator. Estimate DC, single-phase, and three-phase AC voltage drop from AWG wire size, length, current, and material with temperature correction and 3%/5% limit checks.

Size copper traces from current and temperature rise using IPC-2221 formulas

Free online LED resistor calculator. Find the right current-limiting resistor from supply voltage, LED forward voltage, and target current, with the closest E24 standard value, power dissipation, and 4-band color code.

Compute 555 timer astable frequency, duty cycle, and monostable pulse width from R and C values, or reverse-solve R1 and R2 from a target frequency.

Decode 3-digit ceramic capacitor markings (104 = 100 nF) to pF, nF, and µF, or convert a capacitance back to its marking code. Supports R decimal notation and EIA tolerance letters — all in your browser.

Estimate how long a battery lasts from its capacity (mAh or Wh), voltage, and average current draw, with derating and reserve options.

Tune your guitar in the browser with reference tones for 5 tunings or live microphone pitch detection - no install, fully offline.

Test mouse buttons, double-click speed, scroll wheel direction and step count, and live pointer coordinates in your browser - with a click-area heatmap. No install needed.

Estimate your display refresh rate (60/120/144/240 Hz and more) in the browser via requestAnimationFrame frame timing over two seconds - no software install needed.

Calibrate your screen with a reference card and measure objects in centimeters or inches on-screen with pixel-perfect tick marks - no download needed.

Estimate total PC component wattage from CPU and GPU TDP, RAM, storage, and fans - recommend PSU capacity with headroom and electricity cost per hour.

Turn any phone or laptop into a spirit level with the DeviceOrientation API — live tilt degrees on two axes with one-tap calibration.

Test any microphone in your browser with a live level meter, waveform, channel check, clipping detection, and playback round-trip.

Run a calibrated Snellen acuity and Amsler-grid self-check on screen with per-pixel size calibration and results guidance.

Play left, right, and stereo test tones plus a frequency sweep in your browser to find silent, swapped, or unbalanced speakers

Look up tap drill sizes for metric coarse and fine, UNC and UNF threads with the 75% thread formula, decimal inch equivalents and close-fit or free-fit clearance options, from a bundled offline chart.

Visualize DeviceMotion and DeviceOrientation data from phone sensors — acceleration, gravity, rotation rate, alpha/beta/gamma angles and compass heading — with iOS 13+ permission handling. Fully client-side.