# O vs PacScan Protect your Shipment

The clearest difference is in-app purchases: O at none against PacScan Protect your Shipment's 2. PacScan Protect your Shipment's advantage is update cadence (every 9 days vs every 3 months) and iOS requirement (12.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. PacScan Protect your Shipment sells 2 in-app purchases, starting at $2.99 per month. O asks for nothing beyond the download.

O ships an update every 3 months, PacScan Protect your Shipment every 9 days. The most recent releases landed on November 5, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | O | PacScan Protect your Shipment |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (5 ratings)](https://appshunter.io/ios/app/o-ring/id485346224/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 35 MB | 20 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Awal Salifu](https://appshunter.io/developer/1869570519) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-ring/id485346224)

This app helps users calculate O-ring dimensions and find suitable O-ring sizes based on installation specifications. It supports metric and inch measurements and offers chemical compatibility checks for various media.

**Highlights:** O-Ring housing calculation, O-Ring size recommendation, Quick search by international standards, Tolerance calculation, Metric and inch unit switching, Chemical compatibility check

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

**In-app purchases:** none


### PacScan Protect your Shipment

[App page](https://appshunter.io/ios/app/pacscan-protect-your-shipment/id6740433248)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PacScan Premium | $2.99 | per month |
| Remove all the ADS | $2.99 | one-time |


## Frequently asked questions

### Is O free?

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

### Is PacScan Protect your Shipment free?

PacScan Protect your Shipment is free to download, with in-app purchases available.

### Do O or PacScan Protect your Shipment have ads?

Neither O nor PacScan Protect your Shipment shows ads.

### Which is updated more often, O or PacScan Protect your Shipment?

O ships an update every 3 months, and PacScan Protect your Shipment every 9 days. Most recently, O was updated on November 5, 2026 and PacScan Protect your Shipment on October 30, 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.*