# CSU UPAS vs ACOEM Events

The clearest difference is ratings volume: ACOEM Events at 103 against CSU UPAS's 2. CSU UPAS's advantage is rating (5.0 vs 4.8) and update cadence (every 2 months vs every 5 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CSU UPAS holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ACOEM Events has 103 ratings behind it against 2, so its average is the more settled of the two.

CSU UPAS ships an update every 2 months, ACOEM Events every 5 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CSU UPAS | ACOEM Events |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/csu-upas/id1126067765/reviews)** | [4.8 (103 ratings)](https://appshunter.io/ios/app/acoem-events/id1458749652/reviews) |
| Number of ratings | 2 | **103** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free | Free |
| Size | 18 MB | 86 MB |
| Requires iOS | **9.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Colorado State University](https://appshunter.io/developer/527760765) | [American College of Occupational and Environmental Medicine](https://appshunter.io/developer/1458749651) |

## What reviewers say

### CSU UPAS

[App page](https://appshunter.io/ios/app/csu-upas/id1126067765)

This app controls a personal air sampler device. It allows users to customize settings like sample name, flow rate, start time, duration, and GPS location before running the sensor. Data can then be downloaded to your phone or tablet.

**Highlights:** Bluetooth sensor pairing, Customize sample name, Adjust flow rate, Set sensor start time and duration, Configure GPS settings, Download UPAS files

**Features:** macOS Compatibility

**In-app purchases:** none


### ACOEM Events

[App page](https://appshunter.io/ios/app/acoem-events/id1458749652)

Access conference details, presentations, and exhibitor information. Connect with other attendees, take notes on slides, and draw directly on presentation materials within the event app.

**Highlights:** Conference details access, Presentation viewing, Exhibitor information, Attendee networking, Note-taking on slides, Drawing on slides

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

**In-app purchases:** none


## Frequently asked questions

### Is CSU UPAS free?

CSU UPAS is free to download, with no in-app purchases.

### Is ACOEM Events free?

ACOEM Events is free to download, with no in-app purchases.

### Which has better reviews, CSU UPAS or ACOEM Events?

CSU UPAS is rated higher. CSU UPAS averages 5.0 out of 5 from 2 ratings, while ACOEM Events averages 4.8 from 103 ratings.

### Do CSU UPAS or ACOEM Events have ads?

Neither CSU UPAS nor ACOEM Events shows ads.

### Which is updated more often, CSU UPAS or ACOEM Events?

CSU UPAS ships an update every 2 months, and ACOEM Events every 5 months. Most recently, CSU UPAS was updated on October 22, 2026 and ACOEM Events 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.*