# CSU UPAS vs OWL

The clearest difference is iOS requirement: CSU UPAS at 9.0 against OWL's 15.5. On price, update cadence, 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.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 22, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | CSU UPAS | OWL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/csu-upas/id1126067765/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 18 MB | 47 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) | [Open World Learning Inc.](https://appshunter.io/developer/1494932663) |

## 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


### OWL

[App page](https://appshunter.io/ios/app/owl-open-world-learning/id6448217015)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CSU UPAS free?

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

### Is OWL free?

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

### Do CSU UPAS or OWL have ads?

Neither CSU UPAS nor OWL shows ads.

### Which is updated more often, CSU UPAS or OWL?

CSU UPAS ships an update every 2 months, and OWL every 2 months. Most recently, CSU UPAS was updated on October 22, 2026 and OWL on October 3, 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.*