The Stoa Club presents: inCalculus

inCalculus transforms how you understand your body. Using calculus-based analysis, the app tracks water intake, fatigue, sleep, and productivity—then reveals patterns invisible to other apps. See the rate at which your energy drops, not just that it dropped.

Traditional apps show you numbers. inCalculus shows you derivatives and integrals—the mathematics of change. Discover when your hydration velocity is dropping, or calculate your accumulated sleep debt. Real math, real results.

Monitor the four pillars of daily wellness: water intake accumulation, fatigue level trends, sleep quality over time, and productivity momentum. Each module provides personalized thresholds based on your age, weight, and height.

Swipe through your health metrics directly on Apple Watch Ultra. View daily snapshots, weekly progress bars, and monthly trend charts—all without reaching for your phone. Log data with a single tap.

All health data is stored locally on your device. No cloud sync, no servers, no third parties. Your wellness journey remains completely private and under your control.

Available on the App Store for iPhone and Apple Watch. One-time purchase, no subscriptions. Start understanding your health through the lens of mathematics today.