Stackr vs Pepdex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Read full descriptionHide 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
Pepdex
Log peptides, supplements, nutrition, training, and weight with detailed tracking and an evidence-based library. An AI coach provides insights based on your data and research. Scan items to quickly log details.
- Track peptides, supplements, nutrition, workouts, and weight
- Log compound and supplement vial levels
- Scan labels for automatic data entry
- Evidence-based library with research and side effects
- AI Coach for personalized insights
- Daily check-ins for mood, energy, and sleep
Read full descriptionHide full description
Pepdex is a peptide calculator and tracker that gets the units right. Enter your vial size, the water you added and your own dose, and Pepdex shows how much to draw: units on an insulin syringe, or mL on a standard one. The calculator never suggests a dose. The amount always comes from you and your clinician. FREE, NO ACCOUNT NEEDED • Syringe draw: the units or mL to draw for the dose you enter • Water planner: how much water to add so your dose lands on an easy line to read • Concentration, amount per unit and doses per vial • The peptide and supplement library, and the guides TRACK IT WITH PRO • Protocols on your own schedule for any peptide in the catalog, including GLP-1s, plus TRT or a compound you add yourself • A reminder when each shot is due, with an optional heads-up 30 or 60 minutes early • Vials that count down doses and days left as you log, and a heads-up when one runs low • A one-tap shot log and a calendar of logged, planned and missed shots • Supplements, food, water, workouts, weight and daily check-ins • Scan a vial or supplement label to fill in a new entry, or photograph a meal for a calorie estimate A LIBRARY THAT SHOWS ITS RESEARCH Peptide and supplement entries are graded by how much human research PubMed holds on them, with links to the papers, reported side effects and cautions. Many peptide entries also list questions worth asking a provider. Entries the research can't grade explain why. It is educational reference, not medical advice. ASK COACH Coach is an AI assistant for questions about a compound, a side effect or what the research found. A free account gets 10 Coach messages a day, and Pro includes more. Without an account, Coach answers from the catalog stored on your phone. Coach sees a summary of your tracking only while "Let Coach see my numbers" is on. You can turn that off in Settings and keep using Coach. APPLE HEALTH With your permission, Pepdex reads weight, steps, sleep and other data you choose to share from Apple Health, and, if you turn it on, saves the water you log to Health. FREE AND PRO Free: the calculator, the library and guides, and 10 Coach messages a day with a free account. Pro: tracking (protocols, vials, the shot log, shot reminders, supplements, food, water, workouts, weight and check-ins) and more Coach messages. Pro is an auto-renewing subscription with weekly, 3-month and annual plans. The 3-month and annual plans start with a 7-day free trial for new subscribers. Prices are shown in the app before you subscribe. Pepdex does not sell or ship peptides. It is an information and tracking tool, not medical advice. Talk to your clinician before you start, stop or change anything you take. Subscriptions auto-renew unless turned off at least 24 hours before the end of the current period. Payment is charged to your Apple Account at confirmation of purchase, or when a free trial ends. Manage or cancel in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://pepdex.co/privacy
Screenshots
Verdict
The clearest difference is rating: Pepdex at 5.0 against Stackr's 4.4. Pepdex also leads on review sentiment (100% vs 67%). Stackr's advantage is ratings volume (184 vs 6) and chart position (#186 vs unranked). 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
Both are free to download. Stackr sells 7 in-app purchases, starting at $7.99 per 7 days and Pepdex sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
Pepdex holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Stackr has 184 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 67% of Stackr's written reviews are positive against 100% of Pepdex's.
Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 22, 2026 and October 8, 2026 respectively.
| Parameter | Stackr | Pepdex |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (184 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 184 — better | 6 |
| Update frequency | Every 4 days | Every 4 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Freemium |
| Best chart rank | #186 — better | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 88 MB | 68 MB |
| Age rating | 12+ | 17+ |
| Developer | Stackr Holdings LLC | ISMAEL JAVIER RUIZ |
Customer experience
Stackr
Pepdex
In-app purchases
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
Pepdex
- Pepdex Pro Monthly7 Days trial$7.991 Month
- Pepdex Pro Annual7 Days trial$79.991 Year







