Comparison

Pepti vs Stacksy

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

Head to head
About

Pepti

This app precisely tracks compounded GLP-1s, research peptides, and TRT protocols. It offers an AI coach for pharmacology insights, a 12-zone injection site heatmap, and bloodwork analysis. Integrates with WHOOP and Apple Health for comprehensive performance correlation.

Highlights
  • AI Coach for peptide pharmacology
  • 12-zone injection site heatmap
  • Bloodwork analysis and explanation
  • WHOOP and Apple Health integration
  • Extensive compound library
  • Private iCloud sync
Features
Read full description

Pepti is the precision tracker for compounded GLP-1s, Retatrutide, and research peptides - with an AI Coach. Log every dose. Rotate injection sites across 12 zones. Read your bloodwork in context. AI COACH (Pro) Ask anything about peptide pharmacology: how compounds work, what a half-life means, and what published research says — every answer cites its source. The Coach explains the science with citations to published research. It never recommends a dose. Answers grounded in pharmacology and your logged history - not a generic health chatbot. Every response includes citations to published research. The Coach does not recommend personal doses; clinical decisions are referred to your healthcare provider. 12-ZONE INJECTION SITE HEATMAP (Pro) Track every injection across 12 anatomical zones - abdomen, thighs, glutes, delts. Pepti shows where you last injected and visualises rotation history. BLOODWORK READING (Pro) Upload your lab results and Pepti displays them against published reference ranges. The Coach explains what biomarkers mean - IGF-1, SHBG, hsCRP, testosterone, metabolic markers, liver function - referencing published research. WHOOP + APPLE HEALTH (Pro) Connect your WHOOP recovery data - HRV, resting heart rate, daily strain, sleep. Apple Health syncs steps, active calories, and HealthKit data. See how your logged compounds correlate with performance. PRIVACY BY DESIGN Your stack stays on your device. When using the AI Coach, your messages and selected app context are sent to Anthropic to generate responses; you must explicitly consent before any data is shared, and you can revoke consent at any time in Settings. No data sold. No ads. Built by an independent developer. THE COMPOUNDS THAT MATTER Compounded semaglutide, tirzepatide, retatrutide, GHK-Cu, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, NAD+, selank, semax, thymosin alpha-1 and more. WHO IT'S FOR Built for users managing their own peptide protocols - compounded GLP-1s, research peptides, TRT, or a full longevity stack. If you want a free shot-reminder app, better options exist. If you want a precision instrument and an AI with deep pharmacology knowledge, Pepti is built for you. PEPTI PRO (SUBSCRIPTION REQUIRED) The following features require an active Pro subscription: • AI Coach (with citations to published research) • Bloodwork reading • 12-zone injection site heatmap • Full compound library • WHOOP and Apple Health integration • Detailed progress analytics Pro Monthly: $12.99 USD / month Pro Annual: $49.99 USD / year (best value) Subscriptions auto-renew unless cancelled at least 24 hours before the period ends. Charged to your Apple ID at purchase. Manage in Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://tessaro.com.au/privacy.html IMPORTANT: Always seek the advice of your doctor or other qualified health provider in addition to using this app, and before making any medical decision. DISCLAIMER Pepti is a dose tracking tool. Not medical advice. The Coach provides general pharmacology education with citations to published research; it does not calculate, recommend, or prescribe medical dosages for individual users. Always consult a qualified healthcare provider before starting, adjusting, or stopping any compound.

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

Pepti4 screens
Stacksy4 screens

Verdict

The call

The clearest difference is monetization model: Pepti at freemium against Stacksy's subscription. Stacksy's advantage is rating (5.0 vs 4.5) and ads (none vs shown). On price, review sentiment, update cadence and in-app purchases 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. Pepti sells 3 in-app purchases, starting at $12.99 per month 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.

ReceptionRating · Positive reviews · Number of ratings

Stacksy holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Stacksy has 16 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 98% of Pepti's written reviews are positive against 100% of Stacksy's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 days. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

Scorecard5 real differences · 5 level
Pepti versus Stacksy: the parameters behind the verdict, then further details
ParameterPeptiStacksy
PriceFreeFree
Rating4.5 (2 ratings)5.0 (16 ratings) — better
Positive reviews98.0% of reviews100.0% of reviews — better
Number of ratings216 — better
Update frequencyEvery 2 daysEvery 2 days
AdsYesNo — better
In-app purchasesYesYes
MonetizationFreemium — betterSubscription
DevicesiPhoneiPhone, iPod — better
Requires iOS17.215.1 — better
Further details — not scored
Size23 MB65 MB
Age rating12+17+
DeveloperTessaro Pty LtdVelor4 LLC

Customer experience

Pepti

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews51 reviews
Positive98.0%
Neutral0.0%
Negative2.0%

Stacksy

All ratings16 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Pepti

Subscriptions3
  • PeptideOS Pro Monthly$12.991 Month
  • Pepti Pro Annual$34.991 Year
  • PeptideOS Pro Annual$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 Pepti free?
Pepti is free to download, with in-app purchases available.
Is Stacksy free?
Stacksy is free to download, with in-app purchases available.
Which has better reviews, Pepti or Stacksy?
Stacksy is rated higher. Pepti averages 4.5 out of 5 from 2 ratings, while Stacksy averages 5.0 from 16 ratings.
Do Pepti or Stacksy have ads?
Pepti shows ads; Stacksy does not.
Which is updated more often, Pepti or Stacksy?
Pepti ships an update every 2 days, and Stacksy every 2 days. Most recently, Pepti was updated on October 21, 2026 and Stacksy on October 11, 2026.

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