Tools
Small things, free, no sign-up.
Each one came out of a system I was working on and was easier to build than to keep explaining. They run entirely in your browser — nothing you type is sent anywhere.
Rate limiter playground
Run six rate limiting algorithms against bursty, scraping and thundering-herd traffic, watch what each one blocks, and copy the nginx, Express, NestJS or Redis config that implements it.
Token bucketSliding windownginxRedis
OpenColour picker
One colour, two readings — as a highlight behind black text and as a flat fill, with the contrast ratio against near-black underneath.
HexHSLWCAG contrast
Open