Generator
FEA Email
Every alias of one address — dot variations and +tags.
Open toolView source
9 tools · all client-side
Tools
that already shipped.
Every tool here is a real project that shipped somewhere else — a published Chrome extension, a standalone repo, a script wired into a live storefront — rebuilt as a page so it runs without an install.
Nothing you type leaves your browser. No accounts, no analytics on the inputs, no server round-trip — the two tools that ask for your location say so up front.
FEA Email FEA JSON ConverterFEA JSON
JSON in, typed models out — 16 languages.
Open toolView sourceFEA Color GeneratorFEA Color
Pick, grade and export a palette — with the contrast maths.
Open toolView sourceFEA QR GeneratorFEA QR
QR codes with no encoder dependency — SVG or PNG.
Open toolView sourceFEA Checklist ReferenceFEA Checklist
262 checks a frontend build should pass before it ships.
Open toolView sourceFEA Calories CalculatorFEA Calories
BMR, daily energy and a macro split.
Open toolView sourceFEA Qibla CalculatorFEA Qibla
Great-circle direction to the Kaaba, from anywhere.
Open toolView sourceFEA Distance CalculatorFEA Distance
Great-circle distance and bearing between two points.
Open toolView sourceFEA OTP PlaygroundFEA OTP
Configure a one-time-code input, then take the snippet.
Open toolView source
Built the same way as everything else here.
Zero runtime dependencies, real focus states, RTL from the start, and a working reduced-motion path. If a tool needed an npm package to exist, it got written instead — the QR encoder is 470 lines for exactly that reason.