Little tools
Small, single-purpose web tools. No accounts, no tracking, no uploads - everything runs in your browser.
Black Screen Screen
Fullscreen black for spotting dust and fingerprints while you clean your monitor.
Screen Tester Screen
Cycle solid colours fullscreen to hunt for dead pixels and backlight bleed.
Keyboard Tester Hardware
See every key register on an on-screen keyboard, with its key code.
Mouse Tester Hardware
Test every button, the wheel and double-click chatter, plus a click-speed test.
Gamepad Tester Hardware
See buttons, triggers and sticks live, check for stick drift and test vibration.
Audio Tester Hardware
Left and right speaker check, tone generator, frequency sweep and a microphone level meter.
Subnet Calculator Network
Network, broadcast, host range and masks for any IPv4 CIDR, with subnet splitting.
Regex Tester Dev
Live match highlighting, capture groups and a replace preview for JavaScript regex.
JWT Decoder Dev
Read a token's header, payload and expiry locally. Nothing is sent anywhere.
Timestamp Converter Dev
Unix timestamps to readable dates and back, in any time zone.
JSON Formatter Dev
Pretty-print, minify and validate JSON, with the error line and column.
Hash & Encode Dev
MD5 and SHA hashes, plus Base64, URL and hex encode/decode.
What My Browser Sees Dev
Screen size, pixel ratio, timezone, language and more - read locally, never sent anywhere.
Password Generator Security
Strong random passwords from your browser's crypto API, with an entropy estimate.
Tap Tempo Music
Tap a beat, get the BPM. Works with the spacebar or a tap.
Metronome Music
A steady click with accents, subdivisions and tap tempo that keeps time in a background tab.
Pomodoro Timer Focus
Focus and break timer with a chime, and the countdown in the tab title.
Typing Speed Test Fun
A 15, 30 or 60 second test with WPM, accuracy and a saved personal best.