# StackTrax vs Piri

The clearest difference is ratings volume: StackTrax at 7 against Piri's 1. StackTrax also leads on update cadence (daily vs every 2 days). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. StackTrax sells 2 in-app purchases, starting at $4.99 per month and Piri sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for StackTrax against 5.0 for Piri. 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.

StackTrax ships an update daily, Piri every 2 days. The most recent releases landed on October 6, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | StackTrax | Piri |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/stacktrax-peptide-tracker/id6769495613/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/piri-peptide-tracker/id6782751257/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 days |
| Monetization | Freemium | Free with in-app purchases |
| Size | 32 MB | 44 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Isaiah Deutsch](https://appshunter.io/developer/1896663496) | [RASHAD ABDULBARR](https://appshunter.io/developer/1861319402) |

## What reviewers say

### StackTrax

[App page](https://appshunter.io/ios/app/stacktrax-peptide-tracker/id6769495613)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Yearly | $49.99 | per year |


### Piri

[App page](https://appshunter.io/ios/app/piri-peptide-tracker/id6782751257)

This app provides a private, on-device journal for tracking personal wellness routines. It allows users to log doses, follow cycle schedules, record notes, and view trends, all while keeping data secure and offline.

**Highlights:** On-device data storage, Face ID/PIN protection, Dose logging with details, Cycle-based scheduling, Daily check-ins and notes, Trend visualization, Searchable entry history, CSV/PDF export

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PepVault Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is StackTrax free?

StackTrax is free to download, with in-app purchases available.

### Is Piri free?

Piri is free to download, with in-app purchases available.

### Which has better reviews, StackTrax or Piri?

StackTrax and Piri are both rated 5.0 out of 5 on the App Store, from 7 and 1 ratings respectively.

### Do StackTrax or Piri have ads?

Neither StackTrax nor Piri shows ads.

### Which is updated more often, StackTrax or Piri?

StackTrax ships an update daily, and Piri every 2 days. Most recently, StackTrax was updated on October 6, 2026 and Piri on September 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*