# O vs Nexus by Norwalt Digital

The clearest difference is in-app purchases: Nexus by Norwalt Digital at none against O's 2. Nexus by Norwalt Digital also leads on iOS requirement (12.0 vs 17.0). O's advantage is update cadence (weekly vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. O sells 2 in-app purchases, starting at $19.99 per month. Nexus by Norwalt Digital asks for nothing beyond the download.

O ships an update weekly, Nexus by Norwalt Digital every 4 months. The most recent releases landed on November 8, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | O | Nexus by Norwalt Digital |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 months |
| Size | 22 MB | 30 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [FunPokes Inc.](https://appshunter.io/developer/425068703) | [Ei3 Corporation](https://appshunter.io/developer/508119100) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-ring-tracker/id6538715939)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| O-Ring Tracker Pro (1 Month) | $19.99 | per month |
| O-Ring Tracker Pro (1 Year) | $199.99 | per year |


### Nexus by Norwalt Digital

[App page](https://appshunter.io/ios/app/nexus-by-norwalt-digital/id6746648872)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Nexus by Norwalt Digital free?

Nexus by Norwalt Digital is free to download, with no in-app purchases.

### Do O or Nexus by Norwalt Digital have ads?

Neither O nor Nexus by Norwalt Digital shows ads.

### Which is updated more often, O or Nexus by Norwalt Digital?

O ships an update weekly, and Nexus by Norwalt Digital every 4 months. Most recently, O was updated on November 8, 2026 and Nexus by Norwalt Digital on October 28, 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.*