PepStack vs Petal
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
PepStack
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PepStack β Stacks, Vitals, Blood & Training Plan your stack. Track your progress. See what actually works. PepStack is built for people who take their supplements seriously β and want to see how their stack relates to their body, blood and performance. Instead of five apps and a spreadsheet, itβs all in one place, neatly connected and fully private. Four areas, one picture: Stacks Build custom supplement stacks: compound, amount, dosage, schedule and phases β exactly how you run them. A visual plan shows whatβs due when, and reminders make sure you never miss a dose. Vitals Connect Apple Health or Health Connect to pull in steps, sleep, resting heart rate, HRV and more automatically β or log your own metrics by hand. See how your routine shows up in daily life. Blood Log your blood tests β manually or via photo/PDF scan β and keep 100+ markers in view. With a plain-language marker wiki, personal reference ranges, trend charts and a side-by-side comparison of two tests (improved / worse / stable). Training Log your workouts, sets and progress and close the loop: stack, recovery and performance in one app. Everything in context The real value isnβt single numbers β itβs the full picture. Watch how your stack, vitals, blood markers and training move together over time, and make better decisions for yourself. Private by design Sensitive data is end-to-end encrypted β only you have access. Secure cloud backup & sync across your devices. No data sales. Your data is yours. Full stop. Whoβs it for? Biohackers, athletes, self-optimizers and anyone ready to move their supplement routine from sticky notes to a clean, data-driven system. Stop guessing. Start tracking. Get PepStack. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://www.pepstack.net/de/privacy Support: https://www.pepstack.net/contact
Petal
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The beautifully designed peptide companion. For women in their best-self era. Petal makes the math safe, the research trustworthy, and your progress visible. A concentrated app for three things - and three things only: - RECONSTITUTION MATH The dose math that you used to cry over, made simple. Vial size, BAC water, desired dose - Petal gives you the exact units to draw on an animated syringe diagram. No more 2am Reddit threads. No more squinting at a slin pin. - RESEARCH LIBRARY + AI Q&A A curated library of peer-reviewed studies on BPC-157, GHK-Cu, MOTS-c, TB-500, semaglutide, tirzepatide and more - written by humans, citing real research, honest about limitations. Each peptide includes a "For women" section because most peptide research excludes women, and we think you deserve to know that. Ask the AI any question about the science. It's bounded to our curated corpus and refuses dosing recommendations - those belong with your clinician. - INJECTION SITE ROTATION A first-class body map showing your last 14 days of injection sites, color-coded by recency. Tap "next safe site" and Petal suggests where to go. Beautiful, clean, female-default illustration. - THE GLOW JOURNAL (THE RITUAL) Once a week, take a selfie. Petal stores it on your device - never uploaded, never shared. Compare any two weeks with a slider. Watch yourself bloom over a 12-week protocol. Photos stay on this device. They are never uploaded. Period. Health Disclaimer Petal is designed for tracking and educational purposes only. It is not intended to provide any medical guidance or advice. Always consult with your healthcare provider for any medical decisions or health concerns. * some app features require subscription Apple EULA Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://trypeptidepal.com/privacy Term and Conditions: https://trypeptidepal.com/terms Support: https://trypeptidepal.com/support
Screenshots
Verdict
The clearest difference is ads: PepStack at none against Petal's shown. PepStack also leads on update cadence (every 2 days vs every 2 months) and iOS requirement (15.5 vs 18.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. PepStack sells 2 in-app purchases, starting at $2.99 per month and Petal sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
PepStack ships an update every 2 days, Petal every 2 months. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | PepStack | Petal |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days β better | Every 2 months |
| Ads | No β better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPod β better | iPhone |
| Requires iOS | 15.5 β better | 18.0 |
| Further details β not scored | ||
| Size | 85 MB | 19 MB |
| Age rating | 4+ | 17+ |
| Developer | Max Berktold | Kris Diallo |
In-app purchases
PepStack
- PepStack Premium (Monthly)$2.991 Month
- PepStack Premium (Yearly)$22.991 Year
Petal
- Premium Access3 Days trial$4.997 Days
- Premium Access (Yearly)$119.991 Year









