Engineering my own healthspan in public.
I'm Aayush — a software engineer running an independent digital health tech operation. Aayushnitya ships the calculators, Chrome extensions, and mobile apps I build for my own healthspan, plus the guides and research drop I publish along the way.
- Name
- Aayush Gupta
- Role
- Software engineer · founder
- Ops
- Digital health tech
- Ships
- Web tools · extensions · iOS · Android
- Stack
- Spreadsheets, wearables, blood panels
What Aayushnitya is.
An independent digital health tech operation. Web calculators, browser extensions, native mobile apps, paid PDF guides, and a weekly research drop — all aimed at one thing: making healthspan measurable and actionable for the person reading.
Not a clinic, not a coaching service, not a supplement brand. Everything is built to be used once and re-used forever — no account walls, no drip funnels disguised as content.
Free web calculators
35 single-purpose tools that return one useful number — from Zone 2 heart rate to ApoB risk tier.
Chrome extensions
Lightweight wellbeing utilities that live in the browser — nudges, blockers, and quick captures.
Mobile apps
Native iOS and Android apps for tracking, protocols, and on-the-go calculators.
Guides & weekly drop
Field-tested PDF guides and one research-backed email a week — plus a free PDF on signup.
Editorial principles.
Measure first, intervene second.
Every protocol on this site comes after a baseline measurement. If a metric does not move, the protocol gets cut. Quantified self is not a hobby — it is the test bench.
Cite the source.
Formulas behind the calculators are peer-reviewed: Mifflin–St Jeor for resting metabolic rate, US Navy method for body fat, Karvonen for Zone 2 heart rate, biomarker-weighted estimators for biological age. Where the science is contested, that is stated up front.
Minimal software, durable output.
Tools are single-purpose calculators that prerender to static HTML. No accounts. No tracking pixels on the calculation. The PDFs you buy work offline forever.
Honest about what is not known.
Biological age is an estimate, not a diagnosis. Peptide dosing is informational, not medical advice. The site flags speculation explicitly and points to gaps in the evidence base when relevant.
What I personally track.
Every calculator on this site exists because I was already measuring the underlying metric on myself. If I don't track it, I don't publish a tool for it.
Disclosure & medical disclaimer.
I am not a licensed physician, dietitian, or medical professional. Nothing on this site is medical advice. The calculators are educational estimates, not diagnostics. The PDF guides describe protocols I have used on myself or compiled from peer-reviewed sources — they are starting points for discussion with your own clinician, not prescriptions.
If a tool or guide could plausibly interact with a medication or a clinical condition (peptide dosing, prolonged fasting, restrictive macros), the relevant page says so.
Revenue comes from the paid PDF guides on Gumroad. There are no affiliate links on the calculator pages and no sponsored content in the newsletter.
- Affiliate links
- None
- Sponsored content
- None
- Account required
- Never
- Tracking on tools
- None
- Revenue source
- PDF guides only
Get the weekly drop.
One thing I tested, learned, or shipped — every week. Plus a free PDF on signup.