001
popular
Aspect Ratio Calculator
Simplifies any dimensions to a ratio, solves for a missing side, and shows how much crop each…
30 tools · free · no account
Lab — Tools You Will Not Find Elsewhere
The tools here exist because nothing else did them properly. A typing test that tells you <em>which</em> letter pairs are slowing you down and writes a drill for them. A layout comparison run against your own writing rather than a stock paragraph. Detectors for the invisible characters and encoding damage that break a value which "looks identical". And the display arithmetic that actually answers why a monitor will not run at the refresh rate on its box.
30 shown
002
popular
Typing Weakness Analyzer
Times every keystroke, finds the exact letter pairs slowing you down, and writes a practice…
003
popular
Keyboard Layout Comparison
Measures finger travel, same-finger pairs and hand alternation for QWERTY, Dvorak, Colemak and…
004
popular
Invisible Character Detector
Finds zero-width spaces, byte order marks, non-breaking spaces and direction overrides hiding…
005
popular
Mojibake Fixer
Repairs text mangled by the wrong character encoding — the "’" and "é" problem — by…
006
Homograph & Confusable Character Checker
Detects Cyrillic, Greek and fullwidth characters disguised as Latin letters — the basis of…
007
Whitespace & Line Ending Inspector
Reports CRLF versus LF, trailing whitespace, mixed tab and space indentation, and normalises…
008
popular
Display Cable Bandwidth Calculator
Works out the data rate a resolution, refresh rate and colour depth needs, then names the HDMI…
009
popular
Screen Viewing Distance Calculator
Works out how close you can sit before pixels become visible, and the distances for immersive…
010
Input Lag Budget Calculator
Breaks click-to-photon latency into mouse, frame, queue, scan-out, pixel and network stages…
011
Video Bitrate & File Size Calculator
Estimates the bitrate a clip needs from its resolution, frame rate, codec and motion, then…
012
popular
Reaction Time Test
Measures visual reaction time over several rounds, with a false-start guard and an honest note…
013
Reading Speed Test
Measures how fast you read in words per minute, using the supplied passage or any text you…
014
Emoji Rendering Test
Shows which emoji your device can actually draw and which appear as empty boxes, including…
015
Font Availability Checker
Detects which of 70 common fonts are actually installed on your device, so you can debug a CSS…
016
Keyboard Finger Load Analyzer
Shows which fingers and rows do the work when you type your own text, and which one is…
017
popular
Sentence Rhythm Analyzer
Measures the variation in your sentence lengths — the thing that makes prose readable, which…
018
File Transfer Time Calculator
Works out how long a file takes to move at a given connection speed, with realistic overhead…
019
Print Size & DPI Calculator
Converts pixel dimensions into print size at any DPI, and shows the largest good print your…
020
Battery & Power Bank Runtime Calculator
Converts mAh into watt-hours and works out real runtime or how many phone charges a power bank…
021
Password Crack Time Calculator
Estimates how long a password survives against real attack hardware, from a rate-limited login…
022
popular
Oven Temperature Converter
Converts between gas mark, Celsius, Fahrenheit and fan oven settings, with the 20 °C fan…
023
popular
Recipe Scaler
Rescales every quantity in a recipe for a different number of servings, keeping fractions…
024
Paper Size Chart & Pixel Calculator
Every ISO A, B and C size plus US paper sizes, in millimetres, inches and the pixel dimensions…
025
Wire Gauge (AWG) Chart & Calculator
Converts AWG to millimetres and cross-section, with current ratings for chassis and power…
026
Screen Real Estate Checker
Shows how much of your screen a web page actually gets after the taskbar, tab strip and…
027
popular
CSV Column Analyzer
Profiles every column of a CSV — type, blanks, distinct values, ranges — and flags the ragged…
028
Fuzzy Duplicate Finder
Finds lines that are nearly the same, not just identical — catching "Acme Ltd." against "Acme…
029
Speaker Polarity Test
Plays in-phase and inverted noise so you can hear whether a speaker is wired backwards — the…
030
RTL and Bidi Text Checker
Shows how right-to-left text renders against how it is stored, and finds unmatched embeddings…
About these lab — tools you will not find elsewhere
The tools here exist because nothing else did them properly. A typing test that tells you <em>which</em> letter pairs are slowing you down and writes a drill for them. A layout comparison run against your own writing rather than a stock paragraph. Detectors for the invisible characters and encoding damage that break a value which "looks identical". And the display arithmetic that actually answers why a monitor will not run at the refresh rate on its box.
All 30 tools here are free and open immediately — there is no registration step, no credit card and no daily allowance to run out of. Most of them do their work in your browser, which means the page keeps working on a slow connection and your input is never sent to a server.