# Stack - Caffeine & Sleep

> Your Biohacking Dashboard

Canonical page: [https://chrome-stats.com/d/id6800614441](https://chrome-stats.com/d/id6800614441)

## Overview

- **ID:** `id6800614441`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Philipp Ritter
- **Category:** Health & Fitness
- **Version:** 1.4
- **Last updated:** 2026-09-05
- **First published:** 2026-08-20
- **Size:** 4.29 MB
- **Data as of:** 2026-09-26
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/stack-caffeine-sleep/id6800614441)
- **Privacy policy:** [https://south-universe-356.notion.site/Datenschutzerkl-rung-3bb4ebec6c3b80efbe40fda8db5a688e?source=copy\_link](https://south-universe-356.notion.site/Datenschutzerkl-rung-3bb4ebec6c3b80efbe40fda8db5a688e?source=copy_link)

## Description

Precise. Personal. Science-backed.

Stack is your personal biohacking dashboard — caffeine, sleep, water, supplements, and alcohol in one app.

HOW IT WORKS
Caffeine breaks down exponentially at an individual half-life. Stack calculates your current level from everything you've consumed: espresso, filter coffee, matcha, energy drinks, pre-workout.

YOUR SLEEP WINDOW
Instead of a fixed cutoff, Stack learns your personal threshold — the caffeine level below which you sleep well. Set your bedtime. Stack tells you if and when you'll be below it tonight.

AUTO-CALIBRATION WITH APPLE HEALTH (PRO)
Have an Apple Watch? Stack analyzes your heart rate variability (HRV) and resting heart rate relative to your caffeine level and calculates your true personal half-life. The more nights, the more precise the model.

SLEEP INSIGHTS (PRO)
How much deep sleep do you lose when caffeine is still in your blood at bedtime? Stack shows you the correlation from your own sleep data — not general studies, but your nights.

WIDGET
Caffeine level directly on your home screen — small, medium, or as a lock screen widget.

YOUR DAILY STACK
Stack tracks water, creatine, and supplements — and shows you when alcohol is additionally affecting your sleep. Everything in one place, without distraction.

YOUR DATA STAYS YOURS
No account. No cloud. All data stays on your iPhone. Apple Health is optional and used exclusively on-device.

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Stack Pro unlocks: Auto-Calibration · Sleep Insights · Health Dashboard · Notifications · Custom Presets · Tolerance Analysis

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Rankings

- #2,240,192 — Overall

## Similar extensions and apps

- [Caffeine Tracker: Caffi](https://chrome-stats.com/d/id6764276335)
- [Stackhero - Supplement Tracker](https://chrome-stats.com/d/id6766278911)
- [PepStack – Biohacking Tracker](https://chrome-stats.com/d/id6760306960)
- [MyStack:](https://chrome-stats.com/d/id6762099323) — 5.00 / 5
- [SupStack: Supplement Advisor](https://chrome-stats.com/d/id6757682290) — 5.00 / 5
- [Caffi - Caffeine Coach](https://chrome-stats.com/d/id6767020856) — 5.00 / 5
- [Stack: Supplement Tracker](https://chrome-stats.com/d/id6790706147)
- [Quit Caffeine: AI Tracker](https://chrome-stats.com/d/id6760299015)
- [SleepStack: Sleep Protocol](https://chrome-stats.com/d/id6760767864) — 4.00 / 5
- [Cafflow - Caffeine & Sleep](https://chrome-stats.com/d/id6767008311)
- [Stack: Running Log](https://chrome-stats.com/d/id6752502254) — 5.00 / 5
- [Simple Caffeine Tracker](https://chrome-stats.com/d/id6758615552)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6800614441)