# Premmie Marathon Challenge vs Biohack

The clearest difference is in-app purchases: Premmie Marathon Challenge at none against Biohack's 3. Biohack's advantage is update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Biohack sells 3 in-app purchases, starting at $4.99 per month. Premmie Marathon Challenge asks for nothing beyond the download.

Premmie Marathon Challenge ships an update monthly, Biohack every 2 days. The most recent releases landed on November 14, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Premmie Marathon Challenge | Biohack |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Ad-supported | — |
| Size | 52 MB | 61 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [District Technologies Pte Ltd](https://appshunter.io/developer/1451149318) | [BROLY GROUP PTY LTD](https://appshunter.io/developer/6815562099) |

## What reviewers say

### Premmie Marathon Challenge

[App page](https://appshunter.io/ios/app/premmie-marathon-challenge/id6443550095)

Participate in a virtual running, swimming, cycling, or walking challenge to raise funds for premature babies. Track your progress and compete on leaderboards by syncing with your Health app.

**Highlights:** Virtual running, swimming, cycling, and walking challenges, Multiple distance options (21km to 300km), Syncs with Health app (HealthKit), Leaderboard for competition, Fundraising for premature babies

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

**In-app purchases:** none


### Biohack

[App page](https://appshunter.io/ios/app/biohack-peptide-tracker/id6815562097)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Annual | $49.99 | per year |
| Lifetime unlock | $2.99 | one-time |


## Frequently asked questions

### Is Premmie Marathon Challenge free?

Premmie Marathon Challenge is free to download, with no in-app purchases.

### Is Biohack free?

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

### Do Premmie Marathon Challenge or Biohack have ads?

Neither Premmie Marathon Challenge nor Biohack shows ads.

### Which is updated more often, Premmie Marathon Challenge or Biohack?

Premmie Marathon Challenge ships an update monthly, and Biohack every 2 days. Most recently, Premmie Marathon Challenge was updated on November 14, 2026 and Biohack on November 13, 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.*