# Alumni HMSM vs Plastic Avengers

The clearest difference is update cadence: Alumni HMSM at every 2 months against Plastic Avengers's every 6 months. Plastic Avengers's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.4). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Alumni HMSM ships an update every 2 months, Plastic Avengers every 6 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Alumni HMSM | Plastic Avengers |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/plastic-avengers/id1493930893/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | — | Free |
| Size | 101 MB | 65 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Stichting Zuyd Hogeschool](https://appshunter.io/developer/1497866190) | [Stichting Plastic Free Sea](https://appshunter.io/developer/1800668616) |

## What reviewers say

### Alumni HMSM

[App page](https://appshunter.io/ios/app/alumni-hmsm/id1325145189)

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

**In-app purchases:** none


### Plastic Avengers

[App page](https://appshunter.io/ios/app/plastic-avengers/id1493930893)

This app mobilizes users to combat plastic waste by organizing collection campaigns and documenting pollution. It facilitates petitions and advocacy for environmental protection, using camera and location data to create interactive maps for legislative change.

**Highlights:** Organize plastic collection campaigns, Document plastic waste with photos, Create petitions for environmental protection, Advocate for new regulations, View interactive maps of plastic locations, Contribute to environmental data collection

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

**In-app purchases:** none


## Frequently asked questions

### Is Alumni HMSM free?

Alumni HMSM is free to download, with no in-app purchases.

### Is Plastic Avengers free?

Plastic Avengers is free to download, with no in-app purchases.

### Do Alumni HMSM or Plastic Avengers have ads?

Neither Alumni HMSM nor Plastic Avengers shows ads.

### Which is updated more often, Alumni HMSM or Plastic Avengers?

Alumni HMSM ships an update every 2 months, and Plastic Avengers every 6 months. Most recently, Alumni HMSM was updated on October 29, 2026 and Plastic Avengers on October 24, 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.*