Comparison

Peptide Tracker Log & Reminder vs Stackr

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

Head to head
About

Peptide Tracker Log & Reminder

Organize your peptide protocols, track doses, manage vial inventory, and monitor weight trends. Includes built-in calculators and optional reminders to ensure consistency. Access educational content and a helpful assistant for general information.

Highlights
  • Protocol creation with custom schedules
  • Dose logging with notes and site tracking
  • Vial inventory management
  • Body weight tracking
  • Built-in reconstitution and conversion calculators
  • Dose history review
  • Optional dose reminders
Features
Read full description

Stop juggling spreadsheets, notes, reminders, and reconstitution calculators. Peptide Tracker gives you one place to manage your entire peptide protocol. Build your stack, track every dose, manage vials and supplies, monitor injection sites, visualize estimated plasma levels, follow your progress, and connect with people using the same compounds. Whether you're managing one peptide or a complex stack, Peptide Tracker keeps everything organized and easy to understand. TRACK YOUR PROTOCOL Build Your Stack Create protocols with custom doses, schedules, frequencies, and durations. Add common peptides in seconds or create your own custom compounds. Log Every Dose Record scheduled or past doses, add notes, track injection sites, and edit entries anytime. When you correct a dose or change the vial it came from, your inventory updates automatically. Manage Vials and Supplies Keep track of mixed and unmixed vials, concentrations, remaining volume, blend components, bacteriostatic water, and other supplies. Reconstitute a vial right in the app and always know what you have on hand. See Your Estimated Levels Visualize how each compound builds and fades over time with an estimated plasma level curve based on your logged doses and the compound's half-life. Stay on Schedule Optional reminders help you stay consistent. See taken, skipped, and missed doses at a glance, follow your week with a simple checklist, and watch your consistency build a night sky you can share. FOLLOW YOUR PROGRESS Track Your Weight Log your weight over time, follow the trend, and see your progress alongside the protocols you're running. Compare Progress Photos Take consistent progress photos with alignment tools that help you match your framing each time. Browse your photos by month, compare any two side by side, and share the result. Review Your History Browse your complete dose history in a calendar and quickly see what you took, when you took it, and which protocol it belonged to. BUILT-IN PEPTIDE TOOLS Use built-in calculators for reconstitution, syringe-unit conversions, premixed blends, and half-life estimates without leaving the app. CONNECT WITH PEOPLE ON THE SAME COMPOUNDS Ask questions and hear from people who have actually used the compounds you're researching or tracking. Share your own experience through structured answers, reply directly to others, and continue the conversation in open threads with quotes and mentions. Everyone participates under a username rather than a real name, with reporting, blocking, and community notes built in. LEARN AND EXPLORE Browse educational content covering peptide basics and use the Peptide Assistant for general peptide information. YOUR DATA STAYS YOURS Your protocol and progress are yours. Export your data by contacting us at any time or delete your account directly from the app. BUILT FOR PEPTIDE USERS Peptide Tracker was built around the real workflows, terminology, and challenges that come with managing peptide protocols. Track semaglutide, tirzepatide, retatrutide, BPC-157, TB-500, GHK-Cu, CJC-1295, ipamorelin, NAD+, TRT, HRT, custom compounds, blends, and more. Built by peptide users, for peptide users. Peptide Tracker is for tracking and education only. Estimated plasma levels and other calculations are provided for informational purposes and are not medical guidance. Peptide Tracker does not provide medical advice or replace guidance from a qualified medical professional. 100% free. No subscription. No paywall. Download Peptide Tracker and build your first protocol in minutes. Review our Terms of Use at https://peptidetracker.ai/terms and our Privacy Policy at https://peptidetracker.ai/privacy. Questions? Email us at hello@peptidetracker.ai

About

Stackr

This app simplifies tracking peptide and GLP-1 doses, including supplies like vials and pens. It offers smart reminders, home screen widgets, and visual charts of estimated active levels based on half-life. Designed for users managing peptide protocols, it keeps your dosing information organized and accessible.

Highlights
  • Log peptide and GLP-1 doses
  • Track vials, pens, and other supplies
  • Smart reminders for next doses
  • Home screen widgets
  • Estimated active level charts
  • Multi-peptide stack tracking
  • Reference pages for common compounds
Features
Read full description

Stackr is the simplest way to track peptide and GLP-1 dosing. Log every dose. Track vials, pens, tablets, and other containers with how much you have left. Get reminders for your next dose. See how half-life shapes estimated active levels in your stack over time. Built for peptide enthusiasts, GLP-1 users, and anyone who wants their protocol off paper and into an app that understands supplies and dosing cadence — not a generic habit tracker. WHY STACKR • Fast dose logging — log from home or tap the widget when you're in a hurry • Supplies — track what's in the fridge (vials, pens, bottles, sprays, and more) with amounts, low-stock alerts, and typical dose size so "doses left" stays honest • Multi-peptide stacks — run BPC-157 alongside a GLP-1 (or anything else you track) in one place • Active levels — visualize estimated active amount over time from your logged doses and each peptide's half-life (educational estimate, not medical guidance) • Reminders & widgets — next-dose reminders that respect your schedule; home-screen widgets for what's due PEPTIDE LIBRARY Stackr includes reference pages for the most-tracked compounds — semaglutide, tirzepatide, retatrutide, BPC-157, TB-500, MK-677, GHK-Cu, and more. Each page covers typical dosing, half-life, schedule, route, mechanism, and general education. Educational only — Stackr is not medical advice. REMINDERS THAT FIT YOUR PROTOCOL Set reminders aligned with how you dose — daily, every other day, weekly, or custom intervals. Use widgets to see what's next without opening the app. SYNC ACROSS YOUR DEVICES Sign in with Apple or email and your data syncs across iPhone and iPad. Encrypted in transit. Your dosing history stays tied to your account — no ads, no selling data to third parties. BUILT FOR THE PEPTIDE COMMUNITY: By a peptide user, for peptide users. If something's missing, the in-app feedback channel goes straight to the founder. —— Disclaimer: Stackr is for personal tracking only and does not provide medical advice. Consult a qualified healthcare provider before starting or modifying any peptide or pharmaceutical protocol. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ SUBSCRIPTION Stackr is free to download. Full access requires Stackr+, a paid subscription. Estimated level charts, shot planning, home screen widgets, smart reminders, and export reports all require an active Stackr+ subscription and are not available without purchase. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel your subscription in your Apple Account settings.

Screenshots

Peptide Tracker Log & Reminder4 screens
Stackr4 screens

Verdict

The call

The clearest difference is rating: Peptide Tracker Log & Reminder at 4.9 against Stackr's 4.5. Peptide Tracker Log & Reminder also leads on monetization model (free vs freemium) and review sentiment (97% vs 78%). 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 Tracker Log & Reminder sells 8 in-app purchases, starting at $20.00 per year and Stackr sells 7 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Peptide Tracker Log & Reminder holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Peptide Tracker Log & Reminder has 2.2K ratings behind it against 126, so its average is the more settled of the two. Written reviews point the same way: 97% of Peptide Tracker Log & Reminder's written reviews are positive against 78% of Stackr's.

UpkeepUpdate frequency

Peptide Tracker Log & Reminder ships an update every 2 days, Stackr every 3 days. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
Peptide Tracker Log & Reminder versus Stackr: the parameters behind the verdict, then further details
ParameterPeptide Tracker Log & ReminderStackr
PriceFreeFree
Rating4.9 (2.2K ratings) — better4.5 (126 ratings)
Positive reviews97.0% of reviews — better78.3% of reviews
Number of ratings2.2K — better126
Update frequencyEvery 2 days — betterEvery 3 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad — betteriPhone
Requires iOS16.4 — better17.0
Further details — not scored
Size78 MB58 MB
Age rating17+12+
DeveloperFlat Six Labs LLCStackr Holdings LLC

Customer experience

Peptide Tracker Log & Reminder

All ratings2,240 ratings
Positive98.7%
Neutral0.8%
Negative0.6%
Written reviews268 reviews
Positive97.0%
Neutral0.4%
Negative2.6%

Stackr

All ratings126 ratings
Positive88.1%
Neutral1.6%
Negative10.3%
Written reviews23 reviews
Positive78.3%
Neutral4.3%
Negative17.4%

In-app purchases

8 purchases

Peptide Tracker Log & Reminder

Subscriptions7
  • Founding Member$20.001 Year
  • Founding Member$30.001 Year
  • Founding Member$40.001 Year
Show 4 more
  • Founding Member$50.001 Year
  • Founding Member$60.001 Year
  • Founding Member$70.001 Year
  • Founding Member$80.001 Year
One-time1
  • Tip$5.00
7 purchases

Stackr

Subscriptions7
  • Stackr+ Weekly$7.997 Days
  • Monthly$12.991 Month
  • Stackr+ Yearly$29.991 Year
Show 4 more
  • Stackr+ Yearly$49.991 Year
  • Stackr+ Yearly3 Days trial$49.991 Year
  • Stackr+ Yearly$59.991 Year
  • Yearly3 Days trial$69.991 Year

Questions

Is Peptide Tracker Log & Reminder free?
Peptide Tracker Log & Reminder is free to download, with in-app purchases available.
Is Stackr free?
Stackr is free to download, with in-app purchases available.
Which has better reviews, Peptide Tracker Log & Reminder or Stackr?
Peptide Tracker Log & Reminder is rated higher. Peptide Tracker Log & Reminder averages 4.9 out of 5 from 2.2K ratings, while Stackr averages 4.5 from 126 ratings.
Do Peptide Tracker Log & Reminder or Stackr have ads?
Neither Peptide Tracker Log & Reminder nor Stackr shows ads.
Which is updated more often, Peptide Tracker Log & Reminder or Stackr?
Peptide Tracker Log & Reminder ships an update every 2 days, and Stackr every 3 days. Most recently, Peptide Tracker Log & Reminder was updated on September 23, 2026 and Stackr on September 22, 2026.

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