Comparison

Peptide Tracker vs Stack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Peptide Tracker

Log research entries, reconstitution math, and personal schedules for peptide tracking. Features include scheduling reminders, site rotation tracking, and a research literature library. Offers AI insights and Apple Health integration for comprehensive self-tracking.

Highlights
  • Schedule reminders for research entries
  • Site rotation tracker with visual body map
  • Research literature library with 55+ peptides
  • AI insights for pattern analysis
  • Apple Health integration
  • Private and secure data storage
Features
Read full description

AI Peps is a private research log for tracking peptide research entries, reconstitution math, and personal schedules — built for biohackers, researchers, and self-quantifiers who want one organized place for their notes. Important: This app is provided for research and educational purposes only. It is not medical advice, not a diagnostic tool, and not a substitute for a licensed healthcare provider. The compounds referenced are research compounds and are not approved by the FDA (or equivalent regulators) for human use, treatment, diagnosis, or prevention of disease. WHAT YOU CAN DO • Schedule reminders — Set your own recurrence (daily, every-N-days, specific weekdays, weekly) and get reminders so you don't lose track of your research log entries. • Site rotation tracker — A visual body map for logging which site you used for each entry. Helpful for keeping your records organized. • Research literature library — Browse a catalog of 55+ research peptides with mechanism summaries, reported research ranges from published literature, and peer-reviewed citations linked directly to PubMed and journal sources. • AI insights — Optional pattern analysis across your own logged entries: adherence to your schedule, site rotation patterns, and research-log consistency. Insights are observations on your own data, not medical recommendations. • Apple Health integration — Optionally read weight and workout data from HealthKit to keep all your self-tracking in one view. • Private and secure — Your research log is stored privately in your account and never sold or shared. AI Peps includes auto-renewable subscription options for AI Peps Pro. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current billing period. Payment is charged to your Apple ID account at confirmation of purchase. You can manage or cancel subscriptions in your Apple ID account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aipeptides.app/privacy

About

Stack

Features
Read full description

Stack is the all-in-one tracker for peptides, GLP-1 medications, and TRT protocols. Log every injection, build custom dosing schedules, track your progress, and keep your full history organized in one private place. Built for adults working with a prescribing healthcare provider, Stack replaces scattered notes and spreadsheets with a simple, consistent system you control. You enter your own values (peptide name, dose, schedule, and sites) and Stack keeps them organized, reminds you, and shows your progress over time. FEATURES • Custom Protocols & Stacks — Build your own multi-peptide protocols with flexible schedules (daily, weekly, every X days, or custom). Run multiple stacks at once, each clearly organized. • Smart Dose Logging — Log every injection in seconds and see what's due today on your Home screen and calendar. A daily streak keeps you consistent. • Reconstitution Calculator — Take the guesswork out of mixing. Enter vial amount, diluent volume, and target dose to get the exact mL or insulin-syringe units to draw. • Vial & Refill Tracking — Set how much each vial holds, watch it deplete with every dose, and refill in one tap. A tap-to-flip ring shows the exact percentage remaining. • Injection Site Tracker — Rotate sites with an interactive body map that remembers your recent spots, so you can avoid reusing the same area. • Apple Health Sync — Pull in weight, BMI, resting heart rate, HRV, sleep, steps, active energy, blood pressure, respiratory rate, body fat, lean mass, and VO2 max to see the full picture. • Progress Photos & Compare — Capture progress photos and view them side by side with weight and date overlays. Hide weight for privacy, then share a branded comparison. • Meal Scan — Snap a photo of your meal to estimate macros and keep nutrition alongside your protocol. • AI Assistant — Ask questions about your active stacks and protocols in a private chat built into the app. • Metrics & Insights — Clean charts and stats show how your protocol is trending over time. • Home Screen Widget — See your next dose and stay on track without opening the app. • Shareable Protocol Card — Generate a clean, branded card of your active protocol to save or share. PRICING Stack requires a subscription to unlock the full experience. IMPORTANT Stack is a personal record-keeping and organization tool for informational purposes only. It does not provide medical advice, diagnosis, or treatment, and is not a substitute for professional care. Always consult a qualified healthcare provider before starting, changing, or stopping any medication or protocol. Terms of Use (EULA): https://www.whatsyourstack.app/terms.html Privacy Policy: https://www.whatsyourstack.app/privacy.html Questions or feedback? Email us at contact@whatsyourstack.app.

Screenshots

Peptide Tracker4 screens
Stack4 screens

Verdict

The call

The clearest difference is update cadence: Peptide Tracker at every 2 days against Stack's every 3 weeks. On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Peptide Tracker sells 2 in-app purchases, starting at $7.99 per month and Stack sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Peptide Tracker ships an update every 2 days, Stack every 3 weeks. The most recent releases landed on October 5, 2026 and October 18, 2026 respectively.

Scorecard1 real difference · 9 level
Peptide Tracker versus Stack: the parameters behind the verdict, then further details
ParameterPeptide TrackerStack
PriceFreeFree
Rating5.0 (5 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings5 — better—
Update frequencyEvery 2 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size19 MB106 MB
Age rating17+17+
DeveloperPepzen LLCAmari Thomas

In-app purchases

2 purchases

Peptide Tracker

Subscriptions2
  • Monthly Premium3 Days trial$7.991 Month
  • Annual Premium$39.991 Year
2 purchases

Stack

Subscriptions2
  • Stack Weekly$9.997 Days
  • Stack Yearly$49.991 Year

Questions

Is Peptide Tracker free?
Peptide Tracker is free to download, with in-app purchases available.
Is Stack free?
Stack is free to download, with in-app purchases available.
Do Peptide Tracker or Stack have ads?
Neither Peptide Tracker nor Stack shows ads.
Which is updated more often, Peptide Tracker or Stack?
Peptide Tracker ships an update every 2 days, and Stack every 3 weeks. Most recently, Peptide Tracker was updated on October 5, 2026 and Stack on October 18, 2026.

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