UToolios is 16 free tools that run entirely in your browser — nothing you type is uploaded, and there's no sign-up.
Finance: mortgage (with amortization), compound interest, loans. Health: BMI, body fat, TDEE. Home: paint & primer, tiles. Developer: JWT decoder, JSON formatter & diff, Base64. Text: word counter, case converter, slugs, text diff.
Each tool shows its formula and limits, and calculators can be embedded free on any site.
