What we do
We turn formulas and official conventions scattered across banks, tax bureaus, hospitals and schools into instant-to-use calculators. Input → browser computes → you see the result along with the steps and source links, so you can verify.
Product principles
- Trustworthy formulas: all calculators reference authoritative sources (WHO, Chinese NHC, banking regulators, tax authorities) and cite them on each tool page.
- Privacy first: file-processing utilities run entirely in your browser; calculators collect no personal data.
- Free core, no paywall: core functionality is free; lightweight non-intrusive ads only cover hosting costs.
- Neutral: results do not favor any bank, school or hospital.
Tech stack
Next.js 15 (App Router + static export), React 19, TypeScript, Tailwind, MDX content, next-intl, Vercel Web Vitals. Deployed to a Tencent Lighthouse VPS via GitHub Actions.
Contact
For suggestions, bugs or partnerships, please use the Contact page.