# Blue Ocean vs PrefixBlock

The clearest difference is in-app purchases: Blue Ocean at none against PrefixBlock's 3. Blue Ocean also leads on iOS requirement (14.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. PrefixBlock sells 3 in-app purchases, starting at $0.99 per month. Blue Ocean asks for nothing beyond the download.

## The numbers

| Metric | Blue Ocean | PrefixBlock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 57 MB | 4 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Do Khac Chung](https://appshunter.io/developer/1876558206) | [Phung Doanh](https://appshunter.io/developer/965062916) |

## What reviewers say

### Blue Ocean

[App page](https://appshunter.io/ios/app/blue-ocean/id6794600318)

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

**In-app purchases:** none


### PrefixBlock

[App page](https://appshunter.io/ios/app/prefixblock-spam-call-filter/id6800204952)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chặn đầu số pro tháng | $0.99 | per month |
| Chặn đầu số pro năm | $4.99 | per year |
| Chặn đầu số trọn đời | $9.99 | one-time |


## Frequently asked questions

### Is Blue Ocean free?

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

### Is PrefixBlock free?

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

### Do Blue Ocean or PrefixBlock have ads?

Neither Blue Ocean nor PrefixBlock shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*