A premium, privacy-first workspace bringing the best of JSON tooling and the calculators you actually use — JSON formatting, mortgages, loans, BMI and more — into one elegant, lightning-fast interface.
No sign-up · Works offline once loaded
The polish of a premium product, the speed of a static page.
No round-trips. Tools run client-side, so results appear the moment you type.
Your JSON, salaries and numbers stay on your machine. Always.
Transparent formulas with clean breakdowns you can trust and verify.