Comparison

Peptide Calculator vs MyStack

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

Head to head
About

Peptide Calculator

Calculate peptide dosages and reconstitution accurately and quickly. Track your injections with timely reminders and live activities. Save custom formulas and sync across devices for seamless management.

Highlights
  • Peptide dosage calculation
  • Reconstitution guidance
  • Injection time tracking
  • Custom formula saving
  • Widget for daily doses
  • Reminders and Live Activities
  • iCloud sync across devices
Features
Read full description

Get the right peptide dosage in seconds and track your shot's time so you never miss it. Simply enter your peptide information, see the optimal syringe size, and dosage, and save your favorite formulas and cycles to your device. Visualize today’s doses with widget and get Reminders and Live activities so you never miss a shot. With iCloud sync, your peptides, dosages and schedules stay up to date across all your Apple devices—no hassles, just accurate results and easy tracking every time. ======================= If you purchase Peptide Calculator, the payment will be charged to your iTunes account. If you purchase a weekly, monthly or yearly subscription, your account will automatically be charged for renewal within 24 hours prior to the end of the current subscription period unless you disable auto-renew. You can turn off auto-renewal at any time by going to your Account Settings on the App Store after purchase. ======================= Terms of Service: https://pepflow.app/terms-of-service/ Privacy Policy: https://pepflow.app/privacy-policy/

About

MyStack

Features
Read full description

The quiet log for your stack. Track doses, vials, and how each day felt — built for people running peptide, GLP-1, or supplement protocols intentionally Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Peptide Calculator4 screens
MyStack4 screens

Verdict

The call

The clearest difference is iOS requirement: MyStack at 15.1 against Peptide Calculator's 18.0. On price, update cadence, 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. Peptide Calculator sells 11 in-app purchases, starting at $0.99 per 7 days and MyStack sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 23, 2026 and September 11, 2026 respectively.

Scorecard1 real difference · 9 level
Peptide Calculator versus MyStack: the parameters behind the verdict, then further details
ParameterPeptide CalculatorMyStack
PriceFreeFree
Rating4.8 (396 ratings) — better—
Positive reviews76.9% of reviews—
Number of ratings396 — better—
Update frequencyEvery 2 weeksEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size135 MB46 MB
Age rating4+17+
Developerkeinois OU2 Man Limited

In-app purchases

11 purchases

Peptide Calculator

Subscriptions11
  • PepFlow PRO (Weekly)3 Days trial$0.997 Days
  • PepFlow PRO (Monthly)3 Days trial$2.991 Month
  • PepFlow PRO (Weekly)3 Days trial$2.997 Days
Show 8 more
  • Peptide PRO (Weekly)3 Days trial2 variants$2.997 Days
  • PepFlow PRO (Weekly)3 Days trial3 variants$3.997 Days
  • PepFlow PRO (Annual)3 Days trial$8.991 Year
  • PepFlow PRO (Monthly)3 Days trial2 variants$9.991 Month
  • Peptide PRO (Annual)3 Days trial$14.991 Year
  • Peptide PRO (Annual)3 Days trial$19.991 Year
  • PepFlow PRO (Annual)3 Days trial2 variants$29.991 Year
  • Peptide PRO (Annual)3 Days trial$44.991 Year
2 purchases

MyStack

Subscriptions2
  • Pro Monthly7 Days trial$9.991 Month
  • Pro Mannual7 Days trial$49.991 Year

Questions

Is Peptide Calculator free?
Peptide Calculator is free to download, with in-app purchases available.
Is MyStack free?
MyStack is free to download, with in-app purchases available.
Do Peptide Calculator or MyStack have ads?
Neither Peptide Calculator nor MyStack shows ads.
Which is updated more often, Peptide Calculator or MyStack?
Peptide Calculator ships an update every 2 weeks, and MyStack every 2 weeks. Most recently, Peptide Calculator was updated on September 23, 2026 and MyStack on September 11, 2026.

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