What we build
Each page answers one practical question with live calculations, plain-language context, the formula used, and important limitations. No account is required, and calculator inputs currently stay in your browser.
What we do not do
We do not hide fixed rules behind an “AI” label or present estimates as certainty. Financial, health, tax, and engineering results are not substitutes for qualified professional advice.
How we expand
A new calculator must meet three tests: its inputs are obtainable, its calculation is reproducible, and its output helps someone take action. Custom scores are planning heuristics with stated weights, not scientifically validated predictions. The workspace combines up to four supported calculators while keeping each formula independent.