Tools
Each of these does one thing, runs entirely in your browser, and sends nothing anywhere. They exist because the answer people actually need is usually one step past what the obvious tool gives them — the rounding error, not just the number; the effective cost, not the headline price.
Aspect Ratio Calculator
Find the missing width or height for any ratio — and see what your rounding did to the ratio, which most calculators hide.
Image Resizer
Resize to a target size with cover or contain. The file never leaves your device; the work happens in your browser.
Color Contrast Checker
Check text against WCAG AA and AAA — and when it fails, see how far each colour has to move to pass, with the corrected value ready to copy.
Video File Size & Bitrate Calculator
Duration, bitrate and file size in both directions, including audio — and both the binary and decimal megabyte, because upload limits disagree about which one they mean.
Cloud Storage Effective Cost Calculator
Storage price per TB is not what you pay. See your effective cost including egress, and the read volume at which the cheapest provider stops being cheapest.
Why these are here
We looked at where a small independent site can still be genuinely useful rather than out-published. In several high-traffic areas the top results are not articles about tools — they are the tools. Writing about them would be pointless; building one is not.
So these are a test as much as a service. If they turn out to be useful to people, more will follow. The reasoning behind how we choose what to build is inhow we test.