About QuicklyTools

QuicklyTools is an independent project built and maintained by Anderson Dev Solutions, a small software studio run by a working developer who got tired of calculator sites buried under pop-ups, sign-up walls, and trackers. The goal here is simple: build the clearest, fastest version of each everyday tool, write a plain-English explanation of how it works, and charge nothing for it.

Every tool on this site was written and tested by hand. We are a real, contactable team — you can reach us any time on our contact page, and we read every message.

We take accuracy seriously. Each calculator is built from published formulas and authoritative sources, then checked against worked examples before it ships:

• Paycheck & tax tools use current IRS federal brackets, Social Security and Medicare (FICA) rates, and published state rates.
• Health tools (BMI, pregnancy) follow the standard formulas used by the CDC and WHO and the clinical conventions for due-date estimation (Naegele's rule).
• Finance tools (loan, mortgage) use the standard amortization formula, the same math a bank uses to build your payment schedule.
• Fitness & accessibility tools use recognized models such as the Riegel race-time formula and the WCAG 2.2 contrast-ratio algorithm.

When a tool produces an estimate rather than an exact figure — taxes and due dates are both estimates by nature — we say so plainly on the page and point you to the right professional. Read more in our guides, where we explain the math behind each calculator in depth.

Privacy first. Every calculation happens locally in your browser. We don't log your inputs or store your results.

No fluff. No accounts, no email walls, no paywalls. Open a tool, get your answer, done.

Accessible. All tools are keyboard-navigable and meet WCAG 2.2 AA contrast standards.