Today
See exactly what is done and what remains.
Supplement & peptide tracking
Never wonder if you took it.
See today’s stack, log every dose in one tap, and stay consistent without relying on memory.
Free daily tracking · No account required · Built for iPhone
The real app
Your whole routine, finally visible.
Supplements, peptide protocols, adherence, history, and the tools around them — together in one focused place.
Peptide protocols
Keep schedules, vials, and upcoming doses together.
Reconstitution calculator
Convert vial strength and BAC water into syringe units.
Site rotation
Log injection sites and find the most-rested option.
Progress
Read adherence, recaps, and patterns without a spreadsheet.
Badges
Turn consistency into milestones worth keeping.
Peptides, organized
A protocol should feel clear, not improvised.
Track doses, routes, schedules, vial life, and titration in the same routine you already use for supplements.
- Vial tracking with a 28-day reconstitution countdown
- Titration schedules that step forward week by week
- Injection-site rotation with a tappable body map
- Estimated active-level curves for Pro members
Built for the real week
Momentum you can see — without perfection theater.
StackDay makes the next action obvious, then gives you enough history to understand the routine you actually kept.
- Monthly adherence heatmap and per-supplement history
- Weekly quests and 24 illustrated achievement badges
- Streak Freezes earned at milestones for missed days
- Home Screen and Lock Screen widgets for quick check-ins
Everything around the habit, in one place.
1,000+ supplements
Browse a built-in catalog, discover curated stacks, or scan a label with your camera.
Reminders that fit
Set time-slot reminders or choose a custom time for an individual supplement.
Interaction awareness
See timing conflicts and suggestions for spacing common supplement combinations.
Simple pricing
Start free. Go Pro when you want more depth.
Daily tracking stays useful without a subscription. Pro unlocks deeper history, insights, and advanced tools.
$0
No trial or payment required.
- Full daily supplement and peptide tracking
- 7-day history
- Time-slot reminders
- Reconstitution calculator
$49.99 / year
7 days free, then $49.99 per year. Cancel anytime.
- Unlimited history and detailed per-item stats
- Peptide active-level curves
- Label scanner and AI Supplement Advisor
- Wellness correlations and weekly recaps
- Custom reminder times across all 8 slots
$4.99 / month
Flexible monthly access. No free trial.
- Everything included with Pro annual
- No long-term commitment
- Cancel anytime in iPhone Settings
Prices shown in USD. App Store pricing may vary by country or region. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period.
Private by design
Your routine belongs to you.
Your supplement and peptide logs are stored locally on your iPhone. No StackDay account is required, and core daily tracking works without a connection.
Replace “Did I take it?” with certainty.
Build your stack, check off today, and let StackDay remember the rest.
