StackDay: Supplement Tracker
Daily Vitamin & Habit Tracker
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
StackDay is the supplement and peptide tracker that finally makes you consistent — check off doses in one tap, watch your streak grow, and see which stacks actually work.
NEW: PEPTIDES + PROTOCOLS
A dedicated Peptides tab for BPC-157, TB-500, semaglutide, retatrutide, and every peptide in between.
• Vial tracking with a 28-day reconstitution countdown
• Titration schedules that step through your protocol week by week for GLP-1s
• Active-level curves (Pro) — see estimated compound levels between doses so you know when the next one is really due
RECONSTITUTION CALCULATOR
Enter your vial strength and BAC water; calculate the syringe units based on the vial details you enter. Reverse mode lets you dial a target dose and see the water to add — no more scribbling on the back of a bottle.
INJECTION SITE ROTATION
A tappable body map covering all 8 subQ sites. Auto-suggests the most-rested spot every time you log a dose, so you never accidentally double up.
DAILY CHECKLIST
Your entire stack in one screen, split by morning, meal, afternoon, pre-workout, evening, and bedtime. Tap to check off each supplement. Satisfying haptics every time.
1,000+ SUPPLEMENT LIBRARY
Vitamins, minerals, adaptogens, nootropics, mushrooms, and performance compounds — all pre-loaded with common dosages and units. Add your full stack in 30 seconds. Scan any label with your camera (Pro).
STREAKS, QUESTS, AND BADGES
• 24 illustrated achievement badges spanning streaks, logging milestones, peptides, and exploration
• 3 weekly quests that rotate on a fresh cycle every week
• Streak Freezes bank automatically at milestones and protect a missed day — because life happens
INTERACTIVE WIDGETS
• Medium Home Screen widget with tap-to-check-off buttons — mark doses without opening the app
• Small widget and Lock Screen widgets for at-a-glance progress
• Peptide widget showing your next dose and vial countdown
• Mark doses taken right from notifications
INTERACTION AWARENESS
16 built-in interaction checks (calcium and iron, coffee and ashwagandha, and more). Timing suggestions space competing supplements hours apart so absorption doesn't fight itself.
PROGRESS THAT MEANS SOMETHING
• 30-day adherence per supplement — see your true best performers
• Monthly heatmap calendar
• Wellness correlation (Pro) — spot which supplements actually move your mood, energy, sleep, and focus
• Apple Health integration for sleep, steps, and workouts
STACKDAY PRO
• Unlimited history and full per-supplement stats
• Active-level curves for peptides
• Custom reminder times for every one of the 8 slots
• Label scanner and AI Supplement Advisor
• Wellness correlation insights and weekly recaps
StackDay Pro is a subscription: choose annual with a 7-day free trial, or weekly.
NOW IN 6 LANGUAGES
English, German, Spanish, French, Portuguese, and Japanese — with more on the way.
PRIVATE BY DESIGN
Your data stays on your iPhone. No account required. Everything is stored locally.
Built for anyone who spends money on supplements and peptides but never sees the payoff because they can't stay consistent. Every dose logged. Every streak counted. Every stack proven.
MEDICAL DISCLAIMER
This app is for personal tracking and calculation purposes only and does not provide medical advice, diagnosis, or treatment recommendations. Always consult your healthcare provider before starting, changing, or stopping any medication or supplement protocol. You are responsible for verifying all calculations and dosing decisions.
Privacy Policy: https://foggy-labs.github.io/privacy/stackday
Terms of Use: https://foggy-labs.github.io/terms
Support: https://foggy-labs.github.io/support
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
This update brings StackDay into full compliance with App Store guidelines.
• Added medical disclaimer to the Peptides tab
• New onboarding flow with flexible subscription options
• Performance improvements and bug fixes
The developer, Fog Hill, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Fog Hill, LLC
- Size
- 23 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 5 more
- English, French, German, Japanese, Portuguese, Spanish
- Age Rating
16+
- 16+
- Frequent
Medical Treatment Information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Pro Weekly Discount USD 0.99
- Pro Weekly USD 1.99
- Pro Annual Discount USD 19.99
- Pro Monthly Discount USD 3.99
- Copyright
- © 2026 Foggy Labs, LLC