# O vs Applied Physics

O and Applied Physics are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

O ships an update every 5 months, Applied Physics every 3 months. The most recent releases landed on September 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | O | Applied Physics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Size | 9 MB | 40 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [teerapat supamitsatian](https://appshunter.io/developer/1504648563) | [Chalit Chathirat](https://appshunter.io/developer/910858647) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-plus-online/id1504677992)

**Features:** macOS Compatibility

**In-app purchases:** none


### Applied Physics

[App page](https://appshunter.io/ios/app/applied-physics/id1528171266)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Applied Physics free?

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

### Do O or Applied Physics have ads?

Neither O nor Applied Physics shows ads.

### Which is updated more often, O or Applied Physics?

O ships an update every 5 months, and Applied Physics every 3 months. Most recently, O was updated on September 17, 2026 and Applied Physics on September 18, 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.*