Comparison

PepPedia vs Stackr

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

Head to head
About

PepPedia

An educational reference for peptide research, offering a comprehensive library of peptide profiles, personal tracking tools for notes and inventory, and helpful math calculators. Securely sync your data across devices to stay organized and informed.

Highlights
  • Peptide research library
  • Personal notes and logs
  • Inventory and expiration tracking
  • Personal metrics logging
  • Reconstitution calculator
  • Concentration math helper
Features
Read full description

PepPedia is an educational reference companion for those researching peptides. Browse information, track your personal notes, and stay organized. Research Library • Browse 80+ peptide profiles with detailed information • Molecular data, mechanisms of action, and published research • Citations and references to scientific studies • Save compounds to your personal library Personal Journal • Create notes and logs for your own records • Timestamp entries and add personal annotations • Organize by category • View your complete history Inventory Organizer • Track supplies, quantities, and expiration dates • Get low-stock and expiration reminders • Stay organized Personal Metrics • Log weight and personal notes • Track trends over time PepPedia Pro • Unlimited protocols and inventory items (free includes 20 of each) • AI assistant for peptide research questions • Stacking interaction checks between compounds • Active level chart for the doses you log • Lab monitoring with trends over time • Personalized insights from your logs and health data • Protocol audit log of every change • Data export to CSV • New features as they are released Your data syncs securely across devices. Start tracking smarter today. This app does not provide medical advice, diagnoses, or treatment recommendations. Information is for educational purposes only. Consult a healthcare provider for medical decisions. Terms of Service (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://pep-pedia.org/privacy

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 all-in-one tracker for your peptide and GLP-1 protocol. Every dose, vial and meal in one place, with the math done for you. KEY FEATURES • Dose tracking and reminders Log a dose in seconds from your Home screen. Run daily, weekly, every-few-days or specific-day schedules, and several protocols at once. Reminders make sure you never miss a dose, and Home Screen widgets show what's next. • Dose calculator Enter your vial strength, water and dose, and see exactly how many units to draw on a U-100 or U-40 syringe. Works in mcg, mg, IU and units. • Supplies and vials Track vials, pens and other supplies. Stackr counts down what's left every time you log and warns you before you run out. • Progress Keep your weight, progress photos and dose history together, with a calendar of taken and missed doses and estimated active levels from your logs. • Food and calories Snap a meal, scan a barcode, search a food or just say what you ate. Stackr tracks calories and protein against your daily plan. • Stackr Coach Ask the AI coach questions about your routine and your meals, any time. • Learn Reference pages for semaglutide, tirzepatide, retatrutide, BPC-157, TB-500, GHK-Cu and 100+ more, with research status and sources. WHY STACKR • Built for GLP-1s and peptides, from one weekly shot to a full stack • Pounds or kilograms, mcg or mg, U-100 or U-40 • Syncs across your devices when you sign in • Message the team directly from Settings Stackr is a personal tracking and educational app. It does not give medical advice, prescribe treatments or tell you which peptide, dose or schedule is right for you. Always talk to a qualified healthcare professional. Active levels and photo-based nutrition values are estimates. SUBSCRIPTION Stackr is free to download. Full access requires a paid Stackr+ subscription. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel your subscription in your Apple Account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://getstackr.app/privacy

Screenshots

PepPedia4 screens
Stackr4 screens

Verdict

The call

The clearest difference is rating: Stackr at 4.4 against PepPedia's 3.5. Stackr also leads on review sentiment (68% vs 53%) and chart position (#192 vs unranked). PepPedia's advantage is iOS requirement (15.1 vs 17.0). On price, ratings volume, update cadence and ads 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. PepPedia sells 2 in-app purchases, starting at $6.99 per month 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

Stackr holds the better App Store score, 4.4 against 3.5. Both are backed by a comparable volume of ratings — 77 and 225 respectively. Written reviews point the same way: 53% of PepPedia's written reviews are positive against 68% of Stackr's.

UpkeepUpdate frequency

PepPedia ships an update every 6 days, Stackr weekly. Both last shipped on November 9, 2026.

Scorecard4 real differences · 7 level
PepPedia versus Stackr: the parameters behind the verdict, then further details
ParameterPepPediaStackr
PriceFreeFree
Rating3.5 (77 ratings)4.4 (225 ratings) — better
Positive reviews52.9% of reviews67.6% of reviews — better
Number of ratings77225 — better
Update frequencyEvery 6 days — betterWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
Best chart rank—#192 — better
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size77 MB88 MB
Age rating17+12+
DeveloperPepPedia, Inc.Stackr Holdings LLC

Customer experience

PepPedia

All ratings67 ratings
Positive68.7%
Neutral1.5%
Negative29.9%
Written reviews34 reviews
Positive52.9%
Neutral5.9%
Negative41.2%

Stackr

All ratings198 ratings
Positive86.9%
Neutral1.0%
Negative12.1%
Written reviews34 reviews
Positive67.6%
Neutral2.9%
Negative29.4%

In-app purchases

2 purchases

PepPedia

Subscriptions2
  • Peppedia Pro Monthly1 Month trial$6.991 Month
  • Peppedia Pro Yearly$19.991 Year
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 PepPedia free?
PepPedia 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, PepPedia or Stackr?
Stackr is rated higher. PepPedia averages 3.5 out of 5 from 77 ratings, while Stackr averages 4.4 from 225 ratings.
Do PepPedia or Stackr have ads?
Neither PepPedia nor Stackr shows ads.
Which is updated more often, PepPedia or Stackr?
PepPedia ships an update every 6 days, and Stackr weekly. Most recently, PepPedia was updated on November 9, 2026 and Stackr on November 9, 2026.

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