Comparison

Stack vs Peptly Health Tracker

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

Head to head
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.

About

Peptly Health Tracker

This app helps you privately track your GLP-1 and peptide research protocols. Log doses, injection sites, and progress with simple charts and smart reminders. Connect with a username-only community for support.

Highlights
  • Log doses and injection sites
  • Track weight and measurements
  • View progress with charts
  • Set smart reminders
  • Manage vial inventory
  • Log bloodwork and lab markers
  • Access research library
Features
Read full description

Peptly is the simple, private way to track your peptide and GLP-1 research protocol. Log your doses, injection sites, and progress in seconds. Watch your trends over time with clean charts. Stay consistent with smart reminders. And connect with a real community — using only a username, so your identity stays private. WHAT YOU CAN DO • Log doses, vials, and injection sites in seconds • Track weight, measurements, and progress photos • See your trends with clean, easy charts • Get gentle reminders so you never miss a dose • Track your vial inventory and get low-supply alerts • Log bloodwork and lab markers in one place • Learn from a research library of compounds • Connect with a private, username-only community Peptly is completely free. IMPORTANT Peptly is an educational and research tracking tool only. It does not provide medical advice, diagnosis, or treatment, and does not sell or recommend any substance for human consumption. Always consult a licensed healthcare provider. You must be 18 or older to use this app.

Screenshots

Stack4 screens
Peptly Health Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: Peptly Health Tracker at none against Stack's 2. Peptly Health Tracker also leads on update cadence (every 2 days vs every 8 days) and iOS requirement (15.1 vs 18.0). Stack's advantage is ads (none vs shown). On price 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. Stack sells 2 in-app purchases, starting at $9.99 per 7 days. Peptly Health Tracker asks for nothing beyond the download.

UpkeepUpdate frequency

Stack ships an update every 8 days, Peptly Health Tracker every 2 days. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 5 level
Stack versus Peptly Health Tracker: the parameters behind the verdict, then further details
ParameterStackPeptly Health Tracker
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 8 daysEvery 2 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
Monetization—Ad-supported
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.1 — better
Further details — not scored
Size136 MB26 MB
Age rating17+17+
DeveloperAmari ThomasJohn Chappell

In-app purchases

2 purchases

Stack

Subscriptions2
  • Stack Weekly$9.997 Days
  • Stack Yearly$49.991 Year
None

Peptly Health Tracker

No in-app purchases

Questions

Is Stack free?
Stack is free to download, with in-app purchases available.
Is Peptly Health Tracker free?
Peptly Health Tracker is free to download, with no in-app purchases.
Do Stack or Peptly Health Tracker have ads?
Peptly Health Tracker shows ads; Stack does not.
Which is updated more often, Stack or Peptly Health Tracker?
Stack ships an update every 8 days, and Peptly Health Tracker every 2 days. Most recently, Stack was updated on October 1, 2026 and Peptly Health Tracker on October 5, 2026.

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