PepCalc Pro vs StackTrax
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PepCalc Pro
This app offers precise calculations for research protocols, managing inventory, and scheduling tasks. It provides a verifiable audit trail with transparent math and is designed for offline use with a focus on user privacy. Export your records in various formats for external documentation.
- Precision concentration calculations
- Visual protocol calendar and scheduling
- Seamless inventory management
- Verifiable records with audit trail
- Offline-first data privacy
- Professional CSV/PDF exporting
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PepCalc Pro is a professional-grade concentration and measurement tracker built for clarity, precision, and privacy. Designed for meticulous research management, it combines deterministic calculations with a complete lifecycle system—all in a 100% offline-first environment. Manage your protocols with ease using the new visual calendar, bridge calculations directly to your inventory, and maintain a verifiable audit trail with "Show Math" transparency. No ads, no accounts, and no subscriptions. CORE FEATURES Precision Calculations - Calculate concentration and required volume with deterministic accuracy. - Visual unit gauge provides a quick "sanity check" for your measurements. - "Show Math" toggle: View exact formulas and intermediate values for total verification. New: Protocol Calendar & Scheduling - Dedicated visual roadmap for your schedules with custom color-coding. - Create recurring schedules linked to specific calculation snapshots. - On-device reminders ensure you stay on track with your protocol. Seamless Inventory Management - Track vials, remaining amounts, and expiration dates. - Instant Inventory Bridge: Create a matching inventory vial directly from a saved preparation. - Automatic decrement: Log a dose and your inventory updates instantly. - Low-stock and expiration alerts. Verifiable Records (History) - Record completed or skipped entries with timestamps and notes. - Ledger-style history: Every record is tied to an immutable "snapshot" of the math used at that time. - Simple, high-level summaries for recent activity and compliance. Designed for Trust & Privacy - Offline-first: Your data never leaves your device. - One-time purchase: All features included with no subscriptions or hidden fees. - Security: Optional App Lock via Face ID, Touch ID, or PIN. Professional Exporting - Export records as CSV or PDF with custom date-range filtering. - Perfect for external logs, lab notebooks, or personal record-keeping. IMPORTANT NOTICE PepCalc Pro is intended for informational and organizational purposes only. It does not provide medical advice, diagnosis, treatment, or prescriptions. All inputs, outputs, and decisions are the responsibility of the user. Verify all calculations independently.
StackTrax
Track peptide protocols and GLP-1 titrations with detailed logging, reminders, and injection site rotation. Access a research library and integrate with Oura for comprehensive health insights. Includes nutrition tracking and an AI protocol importer.
- Peptide and GLP-1 tracking
- Dose logging and reminders
- Injection site rotation
- Research library with compound guides
- Oura integration
- AI Protocol Importer
- Nutrition tracking
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The peptide tracker built for people who take their protocol seriously. Whether you're running BPC-157, tracking a GLP-1 titration, tracking TRT, or managing a multi-compound stack — StackTrax helps you stay consistent, never miss a dose, and see what's actually working. FREE Research library — 90+ citation-backed compound guides. FDA labels, PMIDs, or community evidence, clearly labeled. PRO (subscription, manage at stacktrax.com) Log doses across multiple compounds and stacks. Set reminders for any cadence — daily, every other day, every 3 / 4 / 5 days, twice weekly, specific weekdays, "as needed," titration phases, cycle protocols. Injection site rotation with a front / back zone map. Vial inventory and low-stock alerts. Oura integration — readiness, sleep, HRV, resting heart rate, stress, resilience. AI Protocol Importer — paste your existing protocol or upload a screenshot, and StackTrax parses it into a tracker setup. Nutrition tracking — meals, barcode scanner, macros, hydration. HOW TO USE Use the iOS app for daily tracking. Use the web to add or configure new compounds and manage your subscription. Always consult a qualified healthcare provider before starting, changing, or stopping any protocol. IMPORTANT INFORMATION StackTrax is an informational tracking and logging tool. It is not medical advice and does not prescribe, recommend, or facilitate the purchase of any medication or compound. Many compounds tracked in StackTrax (BPC-157, TB-500, MOTS-c, sermorelin, NAD+ injection, others) are not FDA-approved for human use and are legally sold in the US only as research chemicals. We provide tracking tools and informational content; we do not endorse off-label or non-approved use. Subscriptions are managed at stacktrax.com. New users get a 14-day free Pro trial; full pricing shown at signup. Terms of Use: https://stacktrax.com/terms Privacy Policy: https://stacktrax.com/privacy
Screenshots
Verdict
The clearest difference is price: StackTrax at Free against PepCalc Pro's $2.99. StackTrax also leads on update cadence (daily vs every 4 months) and ratings volume (7 vs 1). PepCalc Pro's advantage is in-app purchases (none vs 2). On rating, review sentiment, ads and device support 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
StackTrax is free to download; PepCalc Pro costs $2.99 up front. StackTrax sells 2 in-app purchases, starting at $4.99 per month. PepCalc Pro asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for PepCalc Pro against 5.0 for StackTrax. That said, the two scores are not equally well evidenced: StackTrax has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
PepCalc Pro ships an update every 4 months, StackTrax daily. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.
| Parameter | PepCalc Pro | StackTrax |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (7 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 7 — better |
| Update frequency | Every 4 months | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 41 MB | 32 MB |
| Age rating | 17+ | 17+ |
| Developer | Matthew Fishman | Isaiah Deutsch |
Customer experience
PepCalc Pro
StackTrax
In-app purchases
PepCalc Pro
No in-app purchases
StackTrax
- Pro Monthly14 Days trial$4.991 Month
- Pro Yearly14 Days trial$49.991 Year









