PepPedia vs Stackr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Peptide research library
- Personal notes and logs
- Inventory and expiration tracking
- Personal metrics logging
- Reconstitution calculator
- Concentration math helper
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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
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.
- 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
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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
Verdict
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
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.
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.
PepPedia ships an update every 6 days, Stackr weekly. Both last shipped on November 9, 2026.
| Parameter | PepPedia | Stackr |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (77 ratings) | 4.4 (225 ratings) — better |
| Positive reviews | 52.9% of reviews | 67.6% of reviews — better |
| Number of ratings | 77 | 225 — better |
| Update frequency | Every 6 days — better | Weekly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Best chart rank | — | #192 — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 77 MB | 88 MB |
| Age rating | 17+ | 12+ |
| Developer | PepPedia, Inc. | Stackr Holdings LLC |
Customer experience
PepPedia
Stackr
In-app purchases
PepPedia
- Peppedia Pro Monthly1 Month trial$6.991 Month
- Peppedia Pro Yearly$19.991 Year
Stackr
- Stackr+ Weekly$7.997 Days
- Monthly$12.991 Month
- Stackr+ Yearly$29.991 Year
Show 4 moreShow fewer
- Stackr+ Yearly$49.991 Year
- Stackr+ Yearly3 Days trial$49.991 Year
- Stackr+ Yearly$59.991 Year
- Yearly3 Days trial$69.991 Year









