StackDay: Supplement & Peptide

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 auto-step your dose 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; get exact U-100 syringe units instantly. 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

Free tier includes full daily tracking, 7-day history, slot reminders, and the reconstitution calculator.

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.

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