Hardware Tools
Monitor and diagnose hardware: check device specs, performance metrics, and system information directly in your browser.
Calculators 2
Engineering Calculators 1
Resistor Color Code
Decode 4, 5, 6 band resistor colors to ohm value and tolerance, reverse-lookup E12/E24/E48/E96 parts, and check power rating, max current and voltage.
Financial Calculators 1
EV Charging Cost
Calculate the cost to charge an electric car at home vs public DC fast charging. Cost per kWh and per mile, EV vs gas savings, plus annual and monthly cost.
Hardware Tools 35
Connectivity 5
USB Device Viewer
Browser-based USB descriptor inspector via WebUSB. No drivers, no install — read VID/PID, configs, interfaces & endpoints in Chrome/Edge. lsusb alternative.
Network Quality
Test live WiFi and network quality: connection type, effective speed, downlink, round-trip time and jitter via the Network Information API, with CSV export.
Bluetooth Signal Tester
Scan and connect to nearby BLE devices in your browser via Web Bluetooth. Read GATT services and characteristics, monitor RSSI signal strength.
NFC Tester
Web NFC diagnostic tool: read NDEF records and tag serial/UID, write text/URI, lock tags, export CSV/JSON QA reports. NTAG215 & MIFARE on Chrome Android.
Speed Test
Free browser-based internet speed test, no app needed. Measure download & upload Mbps, ping, jitter & packet loss, plus your IP and ISP, in real time.
Diagnostics 10
Camera QR & Barcode Scanner
Free online camera QR code and barcode scanner. Scan QR, UPC, EAN, Code128 and more with your webcam. Runs locally in your browser, no uploads.
Webcam Mirror
Free webcam test and virtual mirror. Check if your camera works, see its actual resolution and frame rate, then use it as a mirror. 100% private and local.
Battery Tester
Free browser battery tester: read live charge level and charging status (Chrome/Edge/Opera only). The browser cannot read cycle count or wear — use the built-in SoH estimator.
Refresh Rate
Test your screen refresh rate online: measure 60, 120, 144, 165, 240, 360 Hz with frame-time chart, jitter stats and CSV/JSON export. Is my monitor 144hz? Free.
Screen Tester
Free monitor & phone screen test for dead pixels, stuck pixels, backlight bleed and OLED burn-in. Fullscreen RGB patterns, no install, 100% private.
Webcam Tester
Free webcam tester with a 10s FPS stability test and PASS/FAIL verdict. Measure real FPS, dropped frames and resolution, then export a CSV/JSON QA report.
Dead Pixel
Detect stuck or dead pixels with fullscreen color tests. Cycle through white, black, and primary colors to spot display defects quickly.
Gamepad Tester
Test PS4, PS5, Xbox & Switch controllers for stuck buttons, analog stick drift, and trigger response. Record a pass/fail diagnostic and export CSV/JSON.
Microphone Tester
Test your mic in-browser with a live dBFS RMS/peak meter, clipping detection and CSV/JSON export. No download. Works in Chrome, Edge, Firefox, Safari.
Speaker Tester
Free online speaker, headphone and sound test. Play a 440 Hz tone or frequency sweep, test left and right channels, and read the live Hz where a rattle hits.
Input Devices 3
Mouse Tester
Free mouse tester: button, scroll-wheel and double-click chatter test with pass/fail verdict, CSV/JSON export, plus refresh-limited movement sampling.
CPS Test
Free CPS test measuring clicks per second for gaming and hardware QA: check mouse click speed, diagnose double-click chatter, jitter, switch wear and latency.
Keyboard Tester
Type to see every key light up on a visual layout (QWERTY/AZERTY, Windows/Mac). Detect stuck keys, ghosting, plus an NKRO / key rollover test. Free.
Performance 4
Storage Test
Free browser storage benchmark using IndexedDB and localStorage. Measure read/write MB/s, per-op latency and run multiple passes to see variance.
Memory Speed Test
Private in-browser JavaScript/V8 memory benchmark. Multi-run sampling with median, stddev and a geometric-mean index. Read ops/sec, not native RAM bandwidth.
GPU Benchmark
Test graphics card performance with WebGL2 rendering, shader computations, particle simulations and 3D graphics. Measure GPU speed, FPS and export results.
CPU Benchmark
Free in-browser single-thread CPU benchmark. Six JavaScript workloads (primes, sort, matrix, hash, FP) score your processor, exportable to CSV/JSON. No install.
Sensors 13
Step Counter
Free online pedometer using your accelerometer. Counts steps, distance, calories and cadence, plus a ground-truth accuracy test with CSV/JSON export.
Motion Analyzer
Test your phone's accelerometer and gyroscope online. Record live X/Y/Z motion, read peak g for drop and shake tests, see min/max/mean stats, export CSV.
Shake Detector
Test your phone's accelerometer and diagnose shake faults after drops or water damage. Read live g-force and m/s², adjust sensitivity, and export a CSV report.
Compass Calibration
Calibrate phone compass: compare magnetometer with sensor-fusion heading, capture true north reference, measure deviation after figure-8 motion.
Sound Level Meter
Free online sound level meter: measure relative dB with your mic, log min/max/average, calibrate against a reference, and export a timestamped CSV.
GPS Location Viewer
Free GPS test in your browser: check location accuracy, TTFF, altitude and speed live, record a track, and export it as GPX, CSV or JSON.
Orientation Tester
Test device orientation, gyroscope and compass with live 3D visualization. Monitor alpha/beta/gamma tilt, check sensor calibration, and export a QA session log.
Ambient Light Tester
Test your device ambient light sensor: live lux reading, analog meter, min/max/avg stats and CSV/JSON export. Chrome/Android only — not iOS or Firefox.
Proximity Sensor Tester
Test a proximity sensor in your browser over HTTPS, log near/far transitions and distance, and export CSV/JSON. Note: most browsers and iOS lack a web proximity API.
Compass
Free online digital compass using your phone's magnetometer. Read the magnetic heading, record a session with min/max/jitter stats and export CSV or JSON.
Gyroscope Tester
Read live DeviceOrientation alpha/beta/gamma angles in degrees on phones and tablets, with a 3D cube, compass heading and CSV/JSON data export.
Magnetometer Tester
Test your phone magnetometer sensor: live microtesla X/Y/Z readings, check against Earth's 25-65 µT field, spot hard-iron interference, plus CSV/JSON export.
Accelerometer Tester
Test your phone or laptop accelerometer in real time: live X, Y, Z acceleration in m/s², 3D vector, gravity & motion magnitude, peak tracking, CSV export.
