Test and measure anything.
A growing suite of free, no-nonsense tools to test, measure and check your device — screen, camera, microphone, keyboard, mouse, sensors and more. Right in your browser, with nothing to install.
No sign-up · No installs · Works offline once loaded
The toolbox
Pick a tool.
26 free tools and counting — all live, all in your browser. Each opens on its own page.
Display health
5 liveDead Pixel Test
Cycle full-screen colors, step through patterns and run a stuck-pixel repair, all in one clean, distraction-free full-screen view.
Screen Test
Walk through color, uniformity, backlight bleed, gradients, sharpness and geometry with what-to-look-for coaching.
Refresh Rate Test
A clean headline reading in Hz with a live stability graph, VRR handling and one-click export.
Stuck Pixel Fixer
Run high-speed color noise over a stuck pixel to try to revive it.
Monitor Color Test
Full-screen color fields and ramps to judge accuracy and banding.
Display & screen info
4 liveScreen Resolution
See both the CSS and true physical resolution, DPR, color depth and aspect ratio — live as you resize or zoom.
Aspect Ratio Calculator
Compute aspect ratios and any missing width or height.
PPI Calculator
Work out pixels-per-inch from resolution and screen diagonal.
Screen Size Calculator
Turn a diagonal and aspect ratio into real-world dimensions.
Measure & calibrate
5 liveOnline Ruler
A calibrated ruler in cm and inches, right on your screen.
Printable Ruler
Download and print a precise ruler in inches and centimeters.
Online Protractor
A draggable protractor to measure angles in degrees.
Bubble Level
Use your device's sensors to level surfaces and hang frames.
Online Compass
A live compass using your device's magnetometer.
Input devices
6 liveKeyboard Tester
Press keys to confirm each one works and spot ghosting.
Mouse & Click Test
Verify left, right, middle and side buttons and the scroll wheel.
Double-Click Test
Detect unwanted double-clicks from a worn-out mouse button.
CPS Test
Measure your clicks-per-second over timed bursts.
Spacebar Counter
A timed spacebar speed and counter challenge.
Scroll Test
Confirm smooth, accurate scrolling in both directions.
Camera & audio
4 liveWhy DeftGauge
A cleaner way to check your gear.
Most of these utilities live on sites that bury a tiny tool under pop-ups and clutter. DeftGauge does the opposite — fast, focused tools that keep the test front and center and respect your attention.
Runs in your browser
Every tool runs locally on your device. Nothing is uploaded, tracked or stored — close the tab and it's gone.
Guided, not guesswork
Each tool tells you exactly what to look for, so you can tell a real fault from normal behavior.
Built for every device
Keyboard, mouse, touch and TV-remote friendly, with true full-screen and a wake lock so the screen never sleeps mid-test.
Everything the incumbents bury, in plain sight.
No cookie wall before you start. Nothing covering the thing you're testing. Just the tools — measured, accurate and explained.
Tool-first, no clutter
The test stays front and center — never behind a pop-up or full-screen interstitial.
Accurate measurement
Refresh rate uses median frame timing and reconciles the native screen API.
Real & CSS resolution
We show both the logical and true physical resolution, and explain the gap.
Detect → repair
The dead-pixel tool doesn't just find stuck pixels, it tries to fix them.
Frequently asked questions
Is DeftGauge free to use?
Yes. Every tool is completely free, with no account and no sign-up. The tools run entirely in your browser.
Does my data leave my device?
No. All tests run locally using standard web APIs. DeftGauge never uploads screenshots, measurements or device details to a server.
Will these tools work on my phone or TV?
Yes. DeftGauge is built for touch and TV remotes as well as mouse and keyboard. Most tools enter full-screen and keep the display awake while you test.
Can a website really fix a stuck pixel?
Sometimes. Rapidly cycling colors over a stuck pixel can coax it back to life. It works best on stuck (lit) pixels rather than truly dead (black) ones — the Dead Pixel Test includes a built-in repair mode to try.
How accurate is the refresh rate test?
Very close, typically within ±1 Hz. We measure the median time between rendered frames and compare it against your browser's reported refresh rate. Running it for 30 seconds improves precision.
Give your device a once-over.
It takes about a minute, and you might be surprised what you find.