# Cargo Sim vs Underline

The clearest difference is in-app purchases: Cargo Sim at none against Underline's 10. Underline's advantage is update cadence (every 2 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Underline sells 10 one-off in-app purchases. Cargo Sim asks for nothing beyond the download.

Cargo Sim ships an update every 2 months, Underline every 2 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Cargo Sim | Underline |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/underline-metro-builder/id6805291888/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 4 MB | 394 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Position Games Limited](https://appshunter.io/developer/376156252) | [Harry Attenborough](https://appshunter.io/developer/1896491884) |

## What reviewers say

### Cargo Sim

[App page](https://appshunter.io/ios/app/cargo-sim/id6764105812)

**Features:** Family Sharing, Vision Pro support

**In-app purchases:** none


### Underline

[App page](https://appshunter.io/ios/app/underline-metro-builder/id6805291888)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mumbai | $2.99 | one-time |
| Shanghai | $2.99 | one-time |
| Delhi | $2.99 | one-time |
| Bangalore | $2.99 | one-time |
| Osaka | $2.99 | one-time |
| Kuala Lumpur | $2.99 | one-time |
| Melbourne | $2.99 | one-time |
| São Paulo | $2.99 | one-time |
| Rio de Janeiro | $2.99 | one-time |
| Unlock Everything | $7.99 | one-time |


## Frequently asked questions

### Is Cargo Sim free?

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

### Is Underline free?

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

### Do Cargo Sim or Underline have ads?

Neither Cargo Sim nor Underline shows ads.

### Which is updated more often, Cargo Sim or Underline?

Cargo Sim ships an update every 2 months, and Underline every 2 days. Most recently, Cargo Sim was updated on November 5, 2026 and Underline 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.*