# Blue vs Depth.

The clearest difference is in-app purchases: Depth. at none against Blue's 3. Blue's advantage is update cadence (every 11 days vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Blue sells 3 in-app purchases, starting at $14.99 per year. Depth. asks for nothing beyond the download.

Blue ships an update every 11 days, Depth. every 5 weeks. The most recent releases landed on October 3, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Blue | Depth. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 5 weeks |
| Size | 121 MB | 2 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Blue Trails GmbH](https://appshunter.io/developer/1844606399) | [Josephus Fransiscus Zegers](https://appshunter.io/developer/1887379576) |

## What reviewers say

### Blue

[App page](https://appshunter.io/ios/app/blue-trails/id6753713007)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Seahorse Subscription | $14.99 | per year |
| Turtle Subscription | $54.99 | per year |
| Shark Subscription | $99.99 | per year |


### Depth.

[App page](https://appshunter.io/ios/app/depth/id6787236119)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue free?

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

### Is Depth. free?

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

### Do Blue or Depth. have ads?

Neither Blue nor Depth. shows ads.

### Which is updated more often, Blue or Depth.?

Blue ships an update every 11 days, and Depth. every 5 weeks. Most recently, Blue was updated on October 3, 2026 and Depth. on October 12, 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.*