Comparison

Stack vs PepsLab

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

Head to head
About

Stack

Features
Read full description

Stack is the all-in-one tracker for peptides, GLP-1 medications, and TRT protocols. Log every injection, build custom dosing schedules, track your progress, and keep your full history organized in one private place. Built for adults working with a prescribing healthcare provider, Stack replaces scattered notes and spreadsheets with a simple, consistent system you control. You enter your own values (peptide name, dose, schedule, and sites) and Stack keeps them organized, reminds you, and shows your progress over time. FEATURES โ€ข Custom Protocols & Stacks โ€” Build your own multi-peptide protocols with flexible schedules (daily, weekly, every X days, or custom). Run multiple stacks at once, each clearly organized. โ€ข Smart Dose Logging โ€” Log every injection in seconds and see what's due today on your Home screen and calendar. A daily streak keeps you consistent. โ€ข Reconstitution Calculator โ€” Take the guesswork out of mixing. Enter vial amount, diluent volume, and target dose to get the exact mL or insulin-syringe units to draw. โ€ข Vial & Refill Tracking โ€” Set how much each vial holds, watch it deplete with every dose, and refill in one tap. A tap-to-flip ring shows the exact percentage remaining. โ€ข Injection Site Tracker โ€” Rotate sites with an interactive body map that remembers your recent spots, so you can avoid reusing the same area. โ€ข Apple Health Sync โ€” Pull in weight, BMI, resting heart rate, HRV, sleep, steps, active energy, blood pressure, respiratory rate, body fat, lean mass, and VO2 max to see the full picture. โ€ข Progress Photos & Compare โ€” Capture progress photos and view them side by side with weight and date overlays. Hide weight for privacy, then share a branded comparison. โ€ข Meal Scan โ€” Snap a photo of your meal to estimate macros and keep nutrition alongside your protocol. โ€ข AI Assistant โ€” Ask questions about your active stacks and protocols in a private chat built into the app. โ€ข Metrics & Insights โ€” Clean charts and stats show how your protocol is trending over time. โ€ข Home Screen Widget โ€” See your next dose and stay on track without opening the app. โ€ข Shareable Protocol Card โ€” Generate a clean, branded card of your active protocol to save or share. PRICING Stack requires a subscription to unlock the full experience. IMPORTANT Stack is a personal record-keeping and organization tool for informational purposes only. It does not provide medical advice, diagnosis, or treatment, and is not a substitute for professional care. Always consult a qualified healthcare provider before starting, changing, or stopping any medication or protocol. Terms of Use (EULA): https://www.whatsyourstack.app/terms.html Privacy Policy: https://www.whatsyourstack.app/privacy.html Questions or feedback? Email us at contact@whatsyourstack.app.

About

PepsLab

Manage your peptide and GLP-1 journey with this app. Track inventory, health metrics, nutrition, and personal logs. Features include AI meal scanning, injection mapping, and symptom tracking for a consistent routine.

Highlights
  • Inventory management with vial photos
  • Visual injection zone mapping
  • Symptom and dosage tracking
  • AI meal scanning for macro estimation
  • Hydration and sleep monitoring
  • GLP-1 weight trend visualization
  • AI pattern recognition for correlations
Features
Read full description

Elevate your peptide and GLP-1 journey with a clear, organized approach. PepsLab is your centralized hub for managing your inventory, health metrics, nutritional data, and personal logs. Say goodbye to messy spreadsheets and enjoy a secure app designed to keep your routine consistent. Note: PepsLab requires a PepsLab Pro auto-renewable subscription (free trial included). All features described below are part of the subscription. PepsLab is designed strictly for informational and record-keeping purposes. CORE FEATURES Inventory Management: Monitor your GLP-1 and peptide stocks, and attach photos of your vials for quick visual reference. Injection Mapping: Rotate your injection zones using a visual body map and markers synced with your inventory. Symptom Tracking: Record over 15 symptoms (fatigue, nausea, etc.) and link them to your dosages to identify your personal trends. Hydration Goals: Track your water intake with a single tap using progress rings and streak tracking. AI Meal Scanner: Snap a picture of your food, and our AI will automatically and accurately estimate and log your macros. Alerts & Timelines: Build a comprehensive history and set up reminders so you never miss a dose. Holistic Tracking: Add progress photos and daily check-ins for your mood, sleep, and energy levels. Weight Trends: Visualize your progress with detailed graphs, perfect for GLP-1 protocols. Centralized Dashboard: Find your weight, hydration, nutrition, and side effects all in one place. Peps Bot: Ask general educational questions about GLP-1s or peptides to our smart assistant. Research Library: Browse over 75 compound profiles with explanations and scientific references. Active Compound Estimator: Track the half-life and peak efficacy of your doses so you always know where you are. Sleep Monitor: Record your cycles and analyze your habits with graphs and heatmaps. AI Pattern Recognition: Discover correlations between your diet, sleep, symptoms, and progress. Themes & Achievements: Customize the interface to your liking and earn badges for your consistency. Private & Secure Your data is securely stored on your device and synced via Apple's private iCloud technology. We never sell your data. Health Disclaimer PepsLab is designed for tracking and educational purposes only. It is not intended to provide medical advice, diagnosis, or dosing instructions. Always consult a healthcare professional for any medical decisions. support@pepslab.app Privacy: https://pepslab.app/privacy Terms: https://pepslab.app/terms

Screenshots

Stack4 screens
PepsLab4 screens

Verdict

The call

The clearest difference is iOS requirement: PepsLab at 15.1 against Stack's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Stack sells 2 in-app purchases, starting at $9.99 per 7 days and PepsLab sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Stack ships an update every 8 days, PepsLab every 4 days. The most recent releases landed on October 1, 2026 and September 23, 2026 respectively.

Scorecard1 real difference ยท 7 level
Stack versus PepsLab: the parameters behind the verdict, then further details
ParameterStackPepsLab
PriceFreeFree
Positive reviewsโ€”100.0% of reviews
Update frequencyEvery 8 daysEvery 4 days โ€” better
AdsNoNo
In-app purchasesYesYes
Monetizationโ€”Subscription
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.1 โ€” better
Further details โ€” not scored
Size136 MB42 MB
Age rating17+17+
DeveloperAmari ThomasEyko LLC

In-app purchases

2 purchases

Stack

Subscriptions2
  • Stack Weekly$9.997 Days
  • Stack Yearly$49.991 Year
2 purchases

PepsLab

Subscriptions2
  • PepsLab Pro Monthly3 Days trial$8.991 Month
  • PepsLab Pro Annual3 Days trial$39.991 Year

Questions

Is Stack free?
Stack is free to download, with in-app purchases available.
Is PepsLab free?
PepsLab is free to download, with in-app purchases available.
Do Stack or PepsLab have ads?
Neither Stack nor PepsLab shows ads.
Which is updated more often, Stack or PepsLab?
Stack ships an update every 8 days, and PepsLab every 4 days. Most recently, Stack was updated on October 1, 2026 and PepsLab on September 23, 2026.

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