# Stackr vs Peptide Injection Tracker

Stackr and Peptide Injection Tracker both sit at 4.4 stars, but that hides the real split: 100% of Peptide Injection Tracker's written reviews are positive against 68% of Stackr's. Stackr's advantage is ratings volume (225 vs 3) and update cadence (weekly vs every 3 weeks). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Stackr sells 7 in-app purchases, starting at $7.99 per 7 days and Peptide Injection Tracker sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.4 for Stackr against 4.3 for Peptide Injection Tracker. That said, the two scores are not equally well evidenced: Stackr has 225 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 68% of Stackr's written reviews are positive against 100% of Peptide Injection Tracker's.

Stackr ships an update weekly, Peptide Injection Tracker every 3 weeks. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Stackr | Peptide Injection Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (225 ratings)](https://appshunter.io/ios/app/stackr-peptide-glp-1-tracker/id6764821587/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/peptide-injection-tracker/id6775596357/reviews) |
| Number of ratings | **225** | 3 |
| Positive reviews | 67.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Freemium | Freemium |
| Best chart rank | **#187** | — |
| Size | 88 MB | 28 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Stackr Holdings LLC](https://appshunter.io/developer/1896525659) | [Juan Ballon](https://appshunter.io/developer/1686619491) |

## What reviewers say

### Stackr

[App page](https://appshunter.io/ios/app/stackr-peptide-glp-1-tracker/id6764821587)

**Currently charting:** #187 Top Grossing · Health & Fitness (US App Store)

This app simplifies tracking peptide and GLP-1 doses, including supplies like vials and pens. It offers smart reminders, home screen widgets, and visual charts of estimated active levels based on half-life. Designed for users managing peptide protocols, it keeps your dosing information organized and accessible.

**Highlights:** Log peptide and GLP-1 doses, Track vials, pens, and other supplies, Smart reminders for next doses, Home screen widgets, Estimated active level charts, Multi-peptide stack tracking, Reference pages for common compounds

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackr+ Weekly | $7.99 | per 7 days |
| Monthly | $12.99 | per month |
| Stackr+ Yearly | $29.99 | per year |
| Stackr+ Yearly | $49.99 | per year |
| Stackr+ Yearly | $49.99 | per year |
| Stackr+ Yearly | $59.99 | per year |
| Yearly | $69.99 | per year |


### Peptide Injection Tracker

[App page](https://appshunter.io/ios/app/peptide-injection-tracker/id6775596357)

Log peptide injections privately on your device. Features include site rotation, reminders, and PDF export. Access a peptide library, concentration helper, and amino acid guide with quizzes.

**Highlights:** On-device logging, Visual body map for site rotation, Daily injection reminders, PDF history export, Peptide library reference, Concentration helper, Amino acid guide and quiz

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Annual | $9.99 | per year |
| Lifetime Pro | $19.99 | one-time |


## Frequently asked questions

### Is Stackr free?

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

### Is Peptide Injection Tracker free?

Peptide Injection Tracker is free to download, with in-app purchases available.

### Which has better reviews, Stackr or Peptide Injection Tracker?

Stackr is rated higher. Stackr averages 4.4 out of 5 from 225 ratings, while Peptide Injection Tracker averages 4.3 from 3 ratings.

### Do Stackr or Peptide Injection Tracker have ads?

Neither Stackr nor Peptide Injection Tracker shows ads.

### Which is updated more often, Stackr or Peptide Injection Tracker?

Stackr ships an update weekly, and Peptide Injection Tracker every 3 weeks. Most recently, Stackr was updated on November 9, 2026 and Peptide Injection Tracker on October 31, 2026.

---

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