Stack vs STAKK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stack
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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 • Custom Protocols & Stacks — Build your own multi-peptide protocols with flexible schedules (daily, weekly, every X days, or custom). Run multiple stacks at once, each clearly organized. • Smart Dose Logging — Log every injection in seconds and see what's due today on your Home screen and calendar. A daily streak keeps you consistent. • Reconstitution Calculator — 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. • Vial & Refill Tracking — 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. • Injection Site Tracker — Rotate sites with an interactive body map that remembers your recent spots, so you can avoid reusing the same area. • Apple Health Sync — 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. • Progress Photos & Compare — Capture progress photos and view them side by side with weight and date overlays. Hide weight for privacy, then share a branded comparison. • Meal Scan — Snap a photo of your meal to estimate macros and keep nutrition alongside your protocol. • AI Assistant — Ask questions about your active stacks and protocols in a private chat built into the app. • Metrics & Insights — Clean charts and stats show how your protocol is trending over time. • Home Screen Widget — See your next dose and stay on track without opening the app. • Shareable Protocol Card — 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.
STAKK
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Take control of your peptide routine with STAKK. STAKK is an all-in-one peptide tracker, injection log, reconstitution calculator, and protocol organizer. Whether you are tracking GLP-1 medications such as Ozempic®, Wegovy®, Mounjaro®, Zepbound®, Rybelsus®, Saxenda®, Victoza® or Trulicity®, peptides such as BPC-157 and TB-500, or a completely custom peptide stack, STAKK helps you keep your doses, injections, schedules, cycles, and history organized in one clean app. PEPTIDE & INJECTION TRACKING Record your injections in seconds and build a complete history of your routine. STAKK keeps your peptide, date, time, dose, and schedule together so you no longer have to rely on scattered notes, screenshots, spreadsheets, or memory. RECONSTITUTION CALCULATOR Take the repetitive math out of reconstitution. Enter the amount in your vial, the volume of reconstitution liquid, and the amount you want to measure. STAKK calculates the resulting concentration and corresponding syringe volume for you. CUSTOM PEPTIDE STACKS STAKK is built for more than one medication or peptide at a time. Organize multiple compounds into your personal stack while maintaining individual schedules, injection records, and histories for each one. SMART SCHEDULES & REMINDERS Create schedules around your routine and let STAKK help you keep track of what comes next. See upcoming injections, follow your cycle timeline, and receive reminders based on the schedules you create. Each peptide or medication can have its own independent schedule, giving you flexibility even when your routine contains multiple compounds with different intervals. INJECTION SITE ROTATION Keep track of where previous injections were administered using a visual injection-site history. Instead of trying to remember which location you used last time, STAKK gives you a simple record you can review whenever needed. CYCLE HISTORY & PROGRESS Your previous routines do not disappear once a cycle ends. STAKK keeps your logged history available so you can review past injections, timing, quantities, peptide combinations, and completed cycles over time. BUILT FOR PEPTIDE TRACKING STAKK can be used to organize many different peptide and GLP-1 routines, including semaglutide, tirzepatide, liraglutide, dulaglutide, retatrutide, BPC-157, TB-500, CJC-1295, Ipamorelin, GHK-Cu, MOTS-c, Tesamorelin, Sermorelin, and custom entries. IMPORTANT HEALTH INFORMATION Availability, approval status, and permitted use of individual substances vary by country. The inclusion of a substance within STAKK does not constitute an endorsement or recommendation for its use. STAKK is a tracking, logging, calculation, and organizational tool only. It does not provide medical advice, diagnosis, treatment recommendations, dosing recommendations, prescribing guidance, or instructions to begin, change, or discontinue any medication, peptide, or other substance. Any calculation shown within STAKK is based on information entered by the user and should be independently verified where appropriate. Always consult a qualified healthcare professional regarding medications, peptides, injections, dosing, side effects, treatment decisions, or other medical concerns. SUBSCRIPTION INFORMATION Some features within STAKK require an active subscription. If you choose to purchase a subscription, payment will be charged to your Apple Account at confirmation of purchase. Subscriptions automatically renew unless auto-renewal is turned off at least 24 hours before the end of the current subscription period. Your account will be charged for renewal within 24 hours before the end of the current period at the price of your selected plan. Subscriptions can be managed or cancelled through your Apple Account Settings. Terms of Use (EULA): STAKK uses Apple’s Standard Licensed Application End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Stack at none against STAKK's shown. Stack also leads on update cadence (every 8 days vs monthly). On price, in-app purchases, device support and iOS requirement 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. Stack sells 2 in-app purchases, starting at $9.99 per 7 days and STAKK sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Stack ships an update every 8 days, STAKK monthly. The most recent releases landed on September 14, 2026 and September 17, 2026 respectively.
| Parameter | Stack | STAKK |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 days — better | Monthly |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 136 MB | 9 MB |
| Age rating | 17+ | 12+ |
| Developer | Amari Thomas | Trusted Brands UG (haftungsbeschrankt) |
In-app purchases
Stack
- Stack Weekly$9.997 Days
- Stack Yearly$49.991 Year
STAKK
- Stakk Premium Weekly$6.997 Days
- Stakk Premium Yearly$49.991 Year









