Comparison

Peptly vs Stacksy

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

Head to head
About

Peptly

This app simplifies peptide reconstitution and dosing for researchers and biohackers. It provides instant calculations, visual syringe guides, and a dose log, all processed on-device for privacy. Unlock advanced features like reminders and export options with a subscription.

Highlights
  • Instant reconstitution math
  • Visual syringe guide
  • Pre-loaded peptide profiles
  • On-device dose log
  • Smart dose reminders
  • Save and reload protocols
  • CSV export
Features
Read full description

Peptly is a private log for the peptides you already use. Write down each entry, get a reminder when the next one is due, follow your weight over time, and keep notes on your vials. Every peptide amount in Peptly is one you typed. FREE • Log one peptide, with Today and a reminder • Injection sites, with your next site suggested from your log • Your weight, with a 30-day trend • The last 30 days of your history • Plain-language profiles of 23 peptides PEPTLY PRO • Stacks: log every peptide you use • Unlimited reminders, with Log and Skip right in the notification • Your full history, with CSV export • Your long-range weight trend, and a 30-day projection: an estimate from your own entries if your recent trend continues, not a prediction or medical advice • Estimated levels for semaglutide and tirzepatide, from your own log and published half-lives. Estimated, not measured. • Vials: what the label says, the date and your notes, exactly as you wrote them TODAY See what's planned today. Log an entry as planned with one tap, or skip it, and your history stays complete. INJECTION SITES Pick a site as you log, and Peptly suggests the one you used longest ago, so rotating is easy. PRIVATE BY DESIGN No account to create. Your log stays on your iPhone or iPad. Peptly Pro is an auto-renewing subscription (weekly, monthly or yearly) or a one-time lifetime purchase; your region's price shows in the app before you buy. Payment is charged to your Apple ID account. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them in your Apple ID account settings. Peptly is a personal record-keeping tool. It never calculates, suggests or recommends an amount to take, and it is not medical advice. Follow the directions of your healthcare provider. Terms of Use: https://thepeptly.com/terms/ Privacy Policy: https://thepeptly.com/privacy/

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

Peptly4 screens
Stacksy4 screens

Verdict

The call

The clearest difference is monetization model: Peptly at freemium against Stacksy's subscription. Stacksy's advantage is update cadence (every 2 days vs weekly) and rating (5.0 vs 4.8). On price, ratings volume, ads 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. Peptly sells 10 in-app purchases, starting at $0.99 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.

ReceptionRating · Positive reviews · Number of ratings

Stacksy holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 34 and 20 respectively.

UpkeepUpdate frequency

Peptly ships an update weekly, Stacksy every 2 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
Peptly versus Stacksy: the parameters behind the verdict, then further details
ParameterPeptlyStacksy
PriceFreeFree
Rating4.8 (34 ratings)5.0 (20 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings34 — better20
Update frequencyWeeklyEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium — betterSubscription
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.615.1 — better
Further details — not scored
Size29 MB65 MB
Age rating12+17+
DeveloperBaris BingorVelor4 LLC

Customer experience

Peptly

All ratings34 ratings
Positive97.1%
Neutral0.0%
Negative2.9%

Stacksy

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

In-app purchases

10 purchases

Peptly

Subscriptions7
  • Peptly Pro Weekly$0.997 Days
  • Peptly Pro Weekly7 Days trial$1.997 Days
  • Peptly Pro Weekly$2.997 Days
Show 4 more
  • Peptly Pro Weekly$4.997 Days
  • Peptly Pro Yearly$19.991 Year
  • Peptly Pro Yearly$29.991 Year
  • Peptly Pro Yearly$49.991 Year
One-time3
  • Peptly Pro Lifetime$29.99
  • Peptly Pro Lifetime$49.99
  • Peptly Pro Lifetime$79.99
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 Peptly free?
Peptly 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, Peptly or Stacksy?
Stacksy is rated higher. Peptly averages 4.8 out of 5 from 34 ratings, while Stacksy averages 5.0 from 20 ratings.
Do Peptly or Stacksy have ads?
Neither Peptly nor Stacksy shows ads.
Which is updated more often, Peptly or Stacksy?
Peptly ships an update weekly, and Stacksy every 2 days. Most recently, Peptly was updated on November 5, 2026 and Stacksy on October 31, 2026.

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