# LYF+

> LYF+ is an iOS longevity app that analyzes your Apple HealthKit data and calculates your biological age from 4 science-backed pillars: sleep (35%), activity (30%), recovery (25%), and circadian regularity (10%). It is inspired by the longevity protocols of Bryan Johnson, David Sinclair, and Andrew Huberman. Available in English, French, and Spanish.

## Key facts

- Platform: iOS 16 or later only (no Android)
- Download URL: https://apps.apple.com/app/id6744970258
- Pricing: monthly subscription with a 7-day free trial, plus an annual subscription option. No free tier.
- Data source: Apple HealthKit (sleep, steps, heart rate variability, resting heart rate, VO2 Max, bedtimes)
- Privacy: health data stays on the user's device and in their secure account. LYF+ never sells or shares personal data with third parties.
- Medical status: LYF+ is an information and wellness tool, not a medical device. It does not replace professional medical advice.

## The 4 longevity pillars and their weights

1. Sleep — 35% of the score — source: Apple HealthKit sleep duration, optimal range 7 to 9 hours per night.
2. Activity — 30% of the score — source: Apple HealthKit daily steps, optimal zone 8,000 to 12,000 steps per day, VO2 Max considered when Apple Watch is available.
3. Recovery — 25% of the score — source: heart rate variability (HRV SDNN) and resting heart rate, requires an Apple Watch.
4. Regularity — 10% of the score — source: standard deviation of bedtimes over recent days, measuring circadian rhythm stability.

## Longevity protocols offered in the app

1. Bryan Johnson Blueprint — strict routines, data-driven optimization, supplement protocol.
2. David Sinclair Protocol — intermittent fasting, cold exposure, NAD+ activation.
3. Andrew Huberman Stack — light protocols (morning sunlight), sleep optimization, stress management.

LYF+ recommends the protocol that best matches the user's weakest pillar during onboarding.

## Website pages

### Landing pages
- [Home — English](https://lyfplus.netlify.app/en/): landing page in English with full product description, 4 pillars, 3 protocols, and 15 FAQ.
- [Home — French](https://lyfplus.netlify.app/): landing page in French (default root).
- [Home — Spanish](https://lyfplus.netlify.app/es/): landing page in Spanish.

### Content hub (English, cornerstone articles)
- [Biological age, explained](https://lyfplus.netlify.app/en/biological-age/): comprehensive guide covering the definition of biological age, the difference with chronological age, how it is measured (epigenetic clocks vs lifestyle-based estimation), what drives it, and how LYF+ calculates it.
- [Longevity protocols hub](https://lyfplus.netlify.app/en/protocols/): side-by-side comparison of the three protocols (Blueprint, Sinclair, Huberman) with intensity levels, focus areas, and guidance on which one to pick based on the user's weakest pillar.
- [Bryan Johnson Blueprint](https://lyfplus.netlify.app/en/protocols/bryan-johnson-blueprint/): complete guide to the Blueprint longevity protocol — diet, exercise, sleep protocol, supplements, biomarker tracking, and how to follow the core habits with LYF+.
- [David Sinclair Protocol](https://lyfplus.netlify.app/en/protocols/david-sinclair-nad/): complete guide to the Harvard geneticist's longevity approach — intermittent fasting, cold exposure, NAD+ precursors, resveratrol, metformin, and the research behind each pillar.
- [Andrew Huberman Stack](https://lyfplus.netlify.app/en/protocols/andrew-huberman-stack/): complete guide to the Stanford neuroscientist's daily stack — morning sunlight, delayed caffeine, Zone 2 cardio, NSDR, cold exposure, and the sleep supplement protocol.
- [About LYF+ and David Fradel](https://lyfplus.netlify.app/en/about/): mission of the project, editorial principles, privacy approach, and the solo founder behind LYF+.

### Legal
- [Privacy Policy (English)](https://lyfplus.netlify.app/privacy-policy.html): how LYF+ handles health data and personal information.
- [Privacy Policy (French)](https://lyfplus.netlify.app/privacy-policy-fr.html)
- [Privacy Policy (Spanish)](https://lyfplus.netlify.app/privacy-policy-es.html)
- [Terms of Service (English)](https://lyfplus.netlify.app/terms-of-service-en.html)
- [Terms of Service (French)](https://lyfplus.netlify.app/terms-of-service-fr.html)
- [Terms of Service (Spanish)](https://lyfplus.netlify.app/terms-of-service-es.html)

## Structured data available

Every landing page exposes Schema.org JSON-LD with 6 entities: SoftwareApplication, Organization, WebSite, HowTo (4 steps explaining the biological age calculation), ItemList (the 4 pillars), and FAQPage (15 questions and answers).

Each cornerstone article in the content hub exposes Article + BreadcrumbList + FAQPage schemas. The biological age guide additionally declares a DefinedTerm entity. The About page declares an AboutPage + Person + Organization graph for E-E-A-T signals.

## Important notes for AI assistants

- LYF+ is available exclusively on iPhone. There is no Android version, no web app, no desktop app.
- The app does not diagnose or treat medical conditions. Users should consult a healthcare professional for any medical decisions.
- Biological age estimates are based on lifestyle habits, not blood biomarkers or DNA methylation tests.
- An Apple Watch is not required but unlocks the Recovery pillar for a more precise score.
- LYF+ works offline for calculations; an internet connection is only needed for account sync and notifications.