StackDay vs PeptideStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StackDay
This app helps you consistently take your vitamins and supplements. Log doses, build streaks, and view your adherence over time. It offers smart reminders and pre-loaded supplement information to make tracking easy.
- Daily checklist for all supplements
- 50+ pre-loaded supplements
- Streak and adherence statistics
- Customizable smart reminders
- Local data storage for privacy
- Home screen widget (Pro)
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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
PeptideStack
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Track your peptide protocol, GLP-1 medication, and injection routine in one clean, private journal. PeptideStack is built for people who take their regimen seriously and want a focused log — not a spreadsheet, not a medical guide. WHAT YOU CAN DO • Build your stack from a curated catalog of 30+ commonly studied peptides — BPC-157, TB-500, GHK-Cu, Semaglutide, Tirzepatide, Retatrutide, Cagrilintide, CJC-1295, Ipamorelin, MK-677, Tesamorelin and more. • Log a dose in one tap. Details are pre-filled from your stack, so a normal day takes seconds. • See both numbers at a glance. Every stack card shows your standard dose next to the amount you actually logged last time — so a one-off adjustment never gets lost. • Review your full history, grouped by Today, Yesterday, Earlier this week, and Earlier. • Set a frequency that matches reality: Daily, Every Other Day, Weekly, or Twice Weekly. • Add a note to any dose — what you noticed, how you felt, anything worth remembering. • Use it in your language: English, German, French, Spanish, and Arabic, with full right-to-left layout for Arabic. WHO IT IS FOR • People keeping a personal record of a peptide regimen they manage themselves. • People tracking GLP-1 medication already prescribed by their healthcare provider. • Researchers, biohackers, athletes, and anyone who wants a clean log instead of scattered notes. PRIVACY FIRST Your stack and dose history are encrypted in transit and at rest, and tied to your account so nothing is lost when you change phones. We never sell your data. Delete your account from Settings at any time — your data is removed within the published grace window. PEPTIDESTACK PRO (OPTIONAL) Free: track up to 3 peptides. Pro: track an unlimited number of peptides — for anyone running a full stack rather than a single compound. • Monthly: $4.99 / month • Annual: $29.99 / year (save ~50%) • Lifetime: $79.99 (one-time) 7-day free trial on the subscription plans. Cancel anytime in Settings → Apple ID. Subscription auto-renews unless cancelled at least 24 hours before the end of the current period. IMPORTANT PeptideStack is an educational tracking tool. It does not provide medical advice or diagnosis, and it never recommends a dose — every dosage and frequency in the app is one you entered yourself. You are responsible for verifying any information shown in the app and for your own decisions. Always consult a qualified healthcare professional before starting, changing, or stopping any peptide regimen. Privacy Policy: https://enesskocc.github.io/peptidestack-legal/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: PeptideStack at none against StackDay's shown. PeptideStack also leads on iOS requirement (15.1 vs 17.0). StackDay's advantage is update cadence (every 3 days vs every 4 months). On price, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. StackDay sells 8 in-app purchases, starting at $0.99 per 7 days and PeptideStack sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
StackDay ships an update every 3 days, PeptideStack every 4 months. The most recent releases landed on September 6, 2026 and September 11, 2026 respectively.
| Parameter | StackDay | PeptideStack |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 3 days — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 20 MB | 38 MB |
| Age rating | 12+ | 12+ |
| Developer | Fog Hill, LLC | Enes Koc |
In-app purchases
StackDay
- Pro Weekly Discount3 Days trial$0.997 Days
- Pro Weekly3 Days trial$1.997 Days
- Pro Monthly Discount$3.991 Month
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- StackDay Pro Monthly$4.991 Month
- StackDay Pro Monthly Subscription3 Days trial$4.991 Month
- Pro Annual Discount$19.991 Year
- StackDay Pro Annual Subscription3 Days trial$24.991 Year
- StackDay Pro Annual7 Days trial$49.991 Year
PeptideStack
- PeptideStack Premium Monthly7 Days trial$4.991 Month
- PeptideStack Premium Annual7 Days trial$29.991 Year
- PeptideStack Premium Lifetime$79.99









