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# Stimly

> Stimly is a personalized caffeine metabolism tracker for iOS. It models how the human body processes caffeine over time using a non-medical pharmacokinetic curve (Bateman infusion model), helping users time their caffeine intake, optimize daytime alertness, and safeguard their sleep architecture.

## Overview
- Website: https://stimly.app
- iOS App Store: https://apps.apple.com/app/id6772148666?ct=llms-txt
- Platform: iOS (Expo SDK 55, React Native 0.83, native Swift widgets)
- Model: Bateman two-compartment oral absorption model (Ka = 1.8 h⁻¹, Ke = 0.12 h⁻¹ baseline / ~5.8h half-life)
- Compliance: Apple App Store Guideline 1.4.1 (wellness & non-medical language only; non-diagnostic)

## Core Capabilities
- **Personalized Metabolism Curve:** Generates a dynamic 16-hour caffeine concentration curve from logged drinks, taking into account user biometrics and metabolic archetypes (CYP1A2 fast vs slow metabolizers, hormonal factors, smoking status).
- **Bedtime Readiness Estimator:** Calculates estimated time to drop below bedtime thresholds (e.g., 25 mg residual caffeine) to protect deep and REM sleep stages.
- **55+ Beverage Reference Database:** Comprehensive laboratory and barista-calibrated caffeine amounts across espresso, pour-over, cold brew, matcha, yerba mate, black/green tea, sodas, and energy drinks.
- **Quick Logging & Widgets:** Lock screen and Home screen widgets for rapid intake logging.

## Key Web Resources
- [Caffeine Drinks Database](https://stimly.app/en/drinks/): Reference table and breakdown of caffeine content across 55+ beverages.
- [Science & Pharmacokinetics](https://stimly.app/en/knowledge/): In-depth scientific explanation of the Bateman equation, clearance rates, adenosine receptor antagonism, and sleep physiology.
- [Espresso Simulator](https://stimly.app/en/knowledge/espresso-lab/): Interactive espresso lab. Grind, ratio, temperature and pressure drive an illustrative extraction model (EY, TDS); caffeine and sleep-ready time come from the same engine as the app.
- [Free Caffeine Timing Protocol (PDF)](https://stimly.app/#protocol): 6-page practical guide on avoiding morning grogginess and timing caffeine peaks.
- [Press Kit](https://stimly.app/press/): Brand background, creator story, product screenshots, and media information.
- [Privacy Policy](https://stimly.app/en/privacy/): GDPR Article 9 privacy disclosures, zero third-party tracking, local-first storage.
- [Terms of Service](https://stimly.app/en/terms/): Terms of use, wellness disclaimer, and subscription details.