Frequently Asked Questions

No. Everything is stored in your browser's localStorage. Your data never leaves your computer. We don't have a server database, we don't collect emails, and we don't track you. If you clear your browser data, your logs disappear — so export regularly if you want to keep them.

BMI is a screening tool, not a diagnostic. It doesn't account for muscle mass, bone density, or body composition. I'm a software engineer with a BMI of 25.3 (technically "overweight"), but I can run a 5K. The trend over time matters more than any single number. For medical decisions, talk to a real doctor.

Source: CDC BMI Interpretation Guidelines

Yes. The site is fully responsive and works on any device. I actually designed it mobile-first because I usually weigh myself Saturday morning and log it while still in my pajamas on the couch.

Click the "Export CSV" button in the history section. It downloads a CSV file with all your records: date, weight, BMI, and height. I export mine every month and keep the files in a folder called "health-stuff" that I never look at. But they're there if I need them.

Because I hate creating accounts for everything. I tried the fancy health apps and they all want your email, want to sync with your watch, want to sell you premium features, and send push notifications about "staying hydrated" at 9 PM. I don't need that energy. This tool is just you and your numbers.

Your history will be gone. That's the trade-off of localStorage. Export your data regularly (takes 2 seconds) if you want to keep it. I learned this the hard way when I cleared my cache to fix a CSS issue and lost 3 months of logs. Now I export every month without fail.

Absolutely not. I'm a software engineer, not a doctor. This is my personal diary and the tool I built for myself. For actual health decisions, talk to a healthcare provider. If you want clinical-grade analysis, check out bmitool.org run by Dr. David Chen, an actual internal medicine physician.

I do it once a week, same time, same conditions (Saturday morning, after bathroom, before breakfast). Daily weighing makes me obsessive and stressed. Weekly gives me the trend without the noise. But honestly? Do what works for your mental health. Some people do daily, some do monthly. The consistency matters more than the frequency.