Comparison

Pep AI vs Stackr

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

Head to head
About

Pep AI

This app helps you meticulously track peptide research, including inventory, logs, nutrition, wellness, and notes. It replaces scattered data with an organized, private system for consistency and offers features like injection site tracking, side effect logging, and AI-powered meal scanning.

Highlights
  • Inventory & Organization
  • Injection Site Tracker
  • Side Effects Tracking
  • Nutrition Logging
  • Meal Scanner
  • Apple Health Integration
  • Bloodwork Tracker
  • AI Insights
Features
Read full description

Pep AI is the GLP-1 and Peptide tracker for shots, nutrition, side effects, weight, wellness, and everything in between. Use Pep AI for Zepbound®, Wegovy®, Ozempic®, Mounjaro®, Foundayo®, semaglutide, tirzepatide, oral GLP-1s, peptides, and weekly injection routines. GLP-1 and Peptide tracking shouldn’t mean scattered notes, forgotten injection sites, missed protein goals, and trying to remember how you felt after your last dose. Pep AI brings your routine together so you can stay consistent and understand your progress over time. NEW IN PEP AI 4.0 • A completely redesigned app: new Home, Dose and Progress screens • Arlo, your companion, with friendlier reminders that fit your day • Home Screen widgets, Live Activities and a redesigned Apple Watch app • Community groups to share progress with others on the same journey • In-app Help articles for every feature TRACK SHOTS, DOSES AND INJECTION SITES • Log GLP-1 and Peptide shots and doses • Give each medication its own dose schedule and reminder times • Track dose timing and history • Rotate injection sites with an interactive body map • Organize vial inventory and photos FOOD, PROTEIN AND WATER • Track calories, protein, carbs, fat and fiber • Quick Log, saved meals and photo meal scans for estimated macros • Log water and track hydration goals • View nutrition and hydration trends • Sync activity data with Apple Health SIDE EFFECTS AND WELLNESS • Log nausea, fatigue, appetite changes and other symptoms • Track symptom timing and severity • Connect symptoms with your dose history • Log energy and mood • Track sleep duration and quality PROGRESS • Track weight and trends over time • Add progress photos • Complete daily wellness check-ins • View your routine in a daily timeline • Earn achievements for staying consistent INSIGHTS AND REPORTS • View your tracking data in one dashboard • See patterns across nutrition, hydration, sleep, side effects and progress • View estimated medication levels and timing • Generate PDF reports to review with your healthcare provider ARLO Ask general educational questions about peptides and GLP-1s directly inside the app. WHY PEP AI Pep AI is built specifically for peptide and GLP-1 routines, giving you one simple place to stay organized and follow your progress. Pep AI is designed for tracking, organization and educational purposes only. It does not provide medical advice, diagnose conditions, recommend treatments or provide dosing instructions. Always consult your healthcare provider about medications, dosing, side effects or health concerns. A paid subscription is required to access Pep AI's tracking features. Your data is stored securely and synced to your account. We do not sell your personal data. Support: support@pepaiapp.com Privacy: https://pepaiapp.com/privacy Terms: https://pepaiapp.com/terms

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

Pep AI4 screens
Stackr4 screens

Verdict

The call

The clearest difference is ads: Stackr at none against Pep AI's shown. Stackr also leads on review sentiment (67% vs 38%) and chart position (#186 vs unranked). Pep AI's advantage is rating (4.7 vs 4.4) and ratings volume (4K vs 184). On price, update cadence, in-app purchases and monetization model 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. Pep AI sells 16 in-app purchases, starting at $3.99 per 7 days 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

Pep AI holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Pep AI has 4K ratings behind it against 184, so its average is the more settled of the two. Written reviews complicate that: 38% of Pep AI's written reviews are positive against 67% of Stackr's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Pep AI ships an update weekly, Stackr every 4 days. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 6 level
Pep AI versus Stackr: the parameters behind the verdict, then further details
ParameterPep AIStackr
PriceFreeFree
Rating4.7 (4K ratings) — better4.4 (184 ratings)
Positive reviews38.4% of reviews66.7% of reviews — better
Number of ratings4K — better184
Update frequencyWeeklyEvery 4 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
Best chart rank—#186 — better
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS16.4 — better17.0
Further details — not scored
Size142 MB88 MB
Age rating17+12+
DeveloperZode Development LLCStackr Holdings LLC

Customer experience

Pep AI

All ratings3,960 ratings
Positive93.4%
Neutral2.0%
Negative4.7%
Written reviews159 reviews
Positive38.4%
Neutral5.7%
Negative56.0%

Stackr

All ratings174 ratings
Positive87.4%
Neutral1.1%
Negative11.5%
Written reviews30 reviews
Positive66.7%
Neutral3.3%
Negative30.0%

In-app purchases

16 purchases

Pep AI

Subscriptions16
  • Pep Week Updated$3.997 Days
  • Pep AI Monthly2 variants$9.991 Month
  • Pep Month Updated4 variants$9.991 Month
Show 13 more
  • Pep AI Yearly Discount$19.991 Year
  • Pep AI Yearly$19.991 Year
  • Pep AI Yearly3 Days trial$24.991 Year
  • Pep Discount Updated$29.991 Year
  • Pep AI Yearly3 Days trial$29.991 Year
  • Pep AI Yearly$29.991 Year
  • Pep Year Updated$29.991 Year
  • Pep Year Updated$34.991 Year
  • Pep Year Updated$39.991 Year
  • Pep Year Updated3 Days trial$39.991 Year
  • Pep Year Updated3 Days trial$44.991 Year
  • Pep Year Subscription3 Days trial$49.991 Year
  • Pep Year Subscription3 Days trial$59.991 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 Pep AI free?
Pep AI 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, Pep AI or Stackr?
Pep AI is rated higher. Pep AI averages 4.7 out of 5 from 4K ratings, while Stackr averages 4.4 from 184 ratings.
Do Pep AI or Stackr have ads?
Pep AI shows ads; Stackr does not.
Which is updated more often, Pep AI or Stackr?
Pep AI ships an update weekly, and Stackr every 4 days. Most recently, Pep AI was updated on October 23, 2026 and Stackr on October 22, 2026.

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