# Below The Layer vs UBOOTSIM

The clearest difference is device support: UBOOTSIM at 3 against Below The Layer's 1. On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Below The Layer against 5.0 for UBOOTSIM. Both are backed by a comparable volume of ratings — 5 and 3 respectively.

Below The Layer ships an update every 6 days, UBOOTSIM every 4 days. Both last shipped on November 6, 2026.

## The numbers

| Metric | Below The Layer | UBOOTSIM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/below-the-layer/id6814332926/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/ubootsim/id6818294804/reviews) |
| Number of ratings | **5** | 3 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 4 days** |
| Monetization | Free | Free |
| Size | 19 MB | 12 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 9+ | 12+ |
| Developer | [James Seaward](https://appshunter.io/developer/1891697161) | [Pablo Kessler Saiz](https://appshunter.io/developer/1818393128) |

## What reviewers say

### Below The Layer

[App page](https://appshunter.io/ios/app/below-the-layer/id6814332926)

Command a submarine in a tactical simulation. Interpret sonar, exploit thermal layers, and make critical decisions about evasion or engagement. Every choice has consequences in this challenging game of stealth and strategy.

**Highlights:** Sonar analysis, Target motion solutions, Periscope observation, Torpedo room operation, Weapon guidance, Patrol mission execution, Stealth tactics

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

**In-app purchases:** none


### UBOOTSIM

[App page](https://appshunter.io/ios/app/ubootsim/id6818294804)

Command a World War II U-boat in the Strait of Gibraltar. Hunt enemy convoys, launch torpedoes, and survive escorts with depth charges. Experience realistic submarine mechanics and soundscapes at your own pace.

**Highlights:** Periscope and binoculars with zoom, Hydrophone for detecting targets, Tactical chart for navigation, Torpedo Data Computer (TDC), Deck gun for surface attacks, Realistic diving and surfacing mechanics, Immersive sound effects

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Below The Layer free?

Below The Layer is free to download, with no in-app purchases.

### Is UBOOTSIM free?

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

### Which has better reviews, Below The Layer or UBOOTSIM?

Below The Layer and UBOOTSIM are both rated 5.0 out of 5 on the App Store, from 5 and 3 ratings respectively.

### Do Below The Layer or UBOOTSIM have ads?

Neither Below The Layer nor UBOOTSIM shows ads.

### Which is updated more often, Below The Layer or UBOOTSIM?

Below The Layer ships an update every 6 days, and UBOOTSIM every 4 days. Most recently, Below The Layer was updated on November 6, 2026 and UBOOTSIM on November 6, 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.*