Our Story

Time is personal.
We treat it that way.

Chronly was built because we believe that how old you are — truly, in every dimension — is one of the most interesting things about being human. We wanted to build the most honest, most accurate, most human set of age tools on the internet.

Why we built Chronly

Age calculators are everywhere. Most are either too simple (just "you are X years old") or too clinical (designed for specific professional workflows). We wanted something in between: tools that treat you like an intelligent adult who deserves to understand not just what the answer is, but why and how it was calculated.

Every tool on Chronly comes with a worked example, cited sources, and honest limitations. The biological age calculator tells you clearly what it can't measure. The pregnancy due date calculator explains Naegele's Rule and why ultrasound is more accurate. The retirement age tool links you directly to SSA documentation. We believe informed users make better decisions.

We are also deeply committed to privacy. Your date of birth, health information, and financial inputs are never transmitted to our servers. All calculations happen entirely in your browser, in JavaScript, on your device. When you close the tab, it's gone.

Our values

🔒

Privacy First

Calculator inputs never leave your browser. No accounts, no tracking, no data selling.

📚

Cite Everything

Every calculation methodology is backed by published research with full citations.

⚖️

Honest Limitations

We tell you exactly what a tool can and cannot do — especially for health and financial tools.

🎯

Precision Matters

Where days matter (clinical assessments, gestational age), we use the exact methods, not approximations.

♿

Accessible to All

WCAG 2.1 AA accessibility standards, keyboard navigation, screen reader tested.

🌱

Always Improving

We review tool accuracy and update content when research changes.

The team behind Chronly

Chronly is a small, independent team. We don't have VC funding or a growth department. We have people who care about getting things right.

👩‍⚕️

Dr. Sarah Chen

Medical Editor & Epidemiologist

MD, MPH from the University of Washington School of Public Health. Reviews all health-related tool content, methodology, and disclaimers. Specialises in life course epidemiology.

💼

James Harrington, CFP®

Financial Content Reviewer

Certified Financial Planner with 15 years in retirement and tax planning. Reviews all financial tool content for accuracy against current SSA and IRS guidance.

🧑‍💻

The Engineering Team

Calculator Development

All calculations are open to scrutiny — the formulas and sources are documented directly on each tool page. We believe in showing our work.

Editorial independence

Advertising revenue (Google AdSense) helps keep Chronly free. Our editorial team operates independently of advertising decisions. Advertisers have no influence over which tools we build, what disclaimers we include, or how we describe our limitations. See our full Editorial Policy.

Contact us