Comparison

PepCalc Pro vs StackTrax

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Precision concentration calculations
  • Visual protocol calendar and scheduling
  • Seamless inventory management
  • Verifiable records with audit trail
  • Offline-first data privacy
  • Professional CSV/PDF exporting
Features
Read full description

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.

About

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.

Highlights
  • Peptide and GLP-1 tracking
  • Dose logging and reminders
  • Injection site rotation
  • Research library with compound guides
  • Oura integration
  • AI Protocol Importer
  • Nutrition tracking
Features
Read full description

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

PepCalc Pro4 screens
StackTrax4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

PepCalc Pro ships an update every 4 months, StackTrax daily. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.

Scorecard5 real differences · 5 level
PepCalc Pro versus StackTrax: the parameters behind the verdict, then further details
ParameterPepCalc ProStackTrax
Price$2.99Free — better
Rating5.0 (1 ratings)5.0 (7 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings17 — better
Update frequencyEvery 4 monthsDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better16.0
Further details — not scored
Size41 MB32 MB
Age rating17+17+
DeveloperMatthew FishmanIsaiah Deutsch

Customer experience

PepCalc Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

StackTrax

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

PepCalc Pro

No in-app purchases

2 purchases

StackTrax

Subscriptions2
  • Pro Monthly14 Days trial$4.991 Month
  • Pro Yearly14 Days trial$49.991 Year

Questions

Is PepCalc Pro free?
PepCalc Pro costs $2.99, with no in-app purchases.
Is StackTrax free?
StackTrax is free to download, with in-app purchases available.
Which has better reviews, PepCalc Pro or StackTrax?
PepCalc Pro and StackTrax are both rated 5.0 out of 5 on the App Store, from 1 and 7 ratings respectively.
Do PepCalc Pro or StackTrax have ads?
Neither PepCalc Pro nor StackTrax shows ads.
Which is updated more often, PepCalc Pro or StackTrax?
PepCalc Pro ships an update every 4 months, and StackTrax daily. Most recently, PepCalc Pro was updated on October 19, 2026 and StackTrax on October 6, 2026.

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