Comparison

Stack vs Stacksy

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

Stacksy

Organize and track your personal peptide protocol with this private application. Manage your entire routine, including what peptides to take and when. Offers monthly and yearly subscription plans for full access.

Highlights
  • Organize peptide protocols
  • Track peptide dosages
  • Schedule peptide intake
  • Private routine management
  • GLP-1 tracking
Features
Read full description

Stacksy is a simple, private way to organize and track your personal peptide protocol. Your whole routine in one place: what you're taking and when to take it. Stacksy requires a Premium auto-renewable subscription to use the app: - Stacksy Premium (Monthly): $9.99 / month - Stacksy Premium (Yearly): $39.99 / year Payment is charged to your Apple ID at purchase confirmation. Your subscription auto-renews unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in your App Store account settings. Privacy Policy: https://stacksy.netlify.app/privacy Terms of Use (EULA): https://stacksy.netlify.app/terms

Screenshots

Stack4 screens
Stacksy4 screens

Verdict

The call

The clearest difference is update cadence: Stacksy at every 2 days against Stack's every 3 weeks. Stacksy also leads on iOS requirement (15.1 vs 18.0). 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. Stack sells 2 in-app purchases, starting at $9.99 per 7 days and Stacksy sells 5 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Stack ships an update every 3 weeks, Stacksy every 2 days. The most recent releases landed on October 18, 2026 and October 11, 2026 respectively.

Scorecard2 real differences · 8 level
Stack versus Stacksy: the parameters behind the verdict, then further details
ParameterStackStacksy
PriceFreeFree
Rating—5.0 (16 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—16 — better
Update frequencyEvery 3 weeksEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Subscription
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size106 MB65 MB
Age rating17+17+
DeveloperAmari ThomasVelor4 LLC

In-app purchases

2 purchases

Stack

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

Stacksy

Subscriptions5
  • Stacksy Pro (Monthly)$9.991 Month
  • Stacksy Pro (Yearly)3 Days trial$24.991 Year
  • Stacksy Pro (Yearly)7 Days trial$24.991 Year
Show 2 more
  • Stacksy Pro (Yearly)$24.991 Year
  • Stacksy Pro (Yearly)3 Days trial$39.991 Year

Questions

Is Stack free?
Stack is free to download, with in-app purchases available.
Is Stacksy free?
Stacksy is free to download, with in-app purchases available.
Do Stack or Stacksy have ads?
Neither Stack nor Stacksy shows ads.
Which is updated more often, Stack or Stacksy?
Stack ships an update every 3 weeks, and Stacksy every 2 days. Most recently, Stack was updated on October 18, 2026 and Stacksy on October 11, 2026.

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