Building one focused calculator in the open (Next.js, honesty, and IndexNow)

We run thecalcs.com —a big library of small, single-purpose calculators. Adding “one more page” is easy; building something trustworthy is the hard part. This is how we approached one tool end to end: stack, where we draw the line on accuracy, and how we nudge search engines when we ship. The stack (boring on purpose) The site is Next.js (App Router), with calculator logic in plain TypeScript modules and UI in React components. We keep the math in lib/ -style modules so the same formulas are tes