# Bio vs StackTrackr

The clearest difference is update cadence: StackTrackr at weekly against Bio's every 2 months. Bio's advantage is iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Bio sells 3 in-app purchases, starting at $1.99 per 7 days and StackTrackr sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Bio ships an update every 2 months, StackTrackr weekly. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Bio | StackTrackr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/stacktrackr-peptide-tracker/id6759632056/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Freemium |
| Size | 42 MB | 60 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [Thomas Ferrer](https://appshunter.io/developer/1801518132) | [PeakHaus Fitness LLC](https://appshunter.io/developer/1879898877) |

## What reviewers say

### Bio

[App page](https://appshunter.io/ios/app/bio-rhythm-caffeine-tracker/id6756811259)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| weekly subscrition | $1.99 | per 7 days |
| monthly subscrition | $5.99 | per month |
| yearly subscription | $29.99 | per year |


### StackTrackr

[App page](https://appshunter.io/ios/app/stacktrackr-peptide-tracker/id6759632056)

This app helps manage hormone therapy, peptide protocols, and research compounds. It calculates doses, tracks injections, manages vial inventory, and builds custom schedules. Log doses quickly from your watch or widgets, and access a database of verified compounds.

**Highlights:** Reconstitution calculator, Dose tracking and logging, Multi-compound protocol management, Vial inventory management, Streak tracking, Verified compound database, Apple Health integration

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro — Monthly | $4.99 | per month |
| Pro — 6 Months | $24.99 | per 6 months |


## Frequently asked questions

### Is Bio free?

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

### Is StackTrackr free?

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

### Do Bio or StackTrackr have ads?

Neither Bio nor StackTrackr shows ads.

### Which is updated more often, Bio or StackTrackr?

Bio ships an update every 2 months, and StackTrackr weekly. Most recently, Bio was updated on October 13, 2026 and StackTrackr on October 14, 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.*