# Orbis Atomus vs Underground

The clearest difference is in-app purchases: Orbis Atomus at none against Underground's 5. Orbis Atomus also leads on ads (none vs shown) and iOS requirement (15.1 vs 17.6). Underground's advantage is chart position (#165 vs unranked). On price and device support there is nothing between them.

Both are free to download. Underground sells 5 one-off in-app purchases. Orbis Atomus asks for nothing beyond the download.

## The numbers

| Metric | Orbis Atomus | Underground |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/underground-bunker-survival/id6778126949/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 72.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 3 days |
| Monetization | — | Paid |
| Best chart rank | — | **#165** |
| Size | 29 MB | 35 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Martin Edmaier](https://appshunter.io/developer/1799800534) | [Sunspear Software LLC](https://appshunter.io/developer/1478643604) |

## What reviewers say

### Orbis Atomus

[App page](https://appshunter.io/ios/app/orbis-atomus/id6758254670)

**Features:** macOS Compatibility

**In-app purchases:** none


### Underground

[App page](https://appshunter.io/ios/app/underground-bunker-survival/id6778126949)

**Currently charting:** #165 Top Paid · Strategy, #185 Top Paid · Simulation (US App Store)

Manage a post-apocalyptic underground bunker, balancing resources, people's needs, and external threats. Build rooms, accept survivors, and guide your community's development through strategic decisions and mini-games.

**Highlights:** Build and manage over 40 types of rooms, Balance essential resources like food, water, and energy, Manage individual survivor skills, health, and stress, Accept or reject new survivors at your gates, Explore tunnels, gather loot, and trade with friends, Engage in mini-games for resources and event outcomes, Play offline with time pausing when the app is closed

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Parts Crate (Small) | $0.99 | one-time |
| Parts Crate (Medium) | $1.99 | one-time |
| Supply Crate (Mixed) | $1.99 | one-time |
| Support the Shelter | $2.99 | one-time |
| Parts Crate (Large) | $3.99 | one-time |


## Frequently asked questions

### Is Orbis Atomus free?

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

### Is Underground free?

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

### Do Orbis Atomus or Underground have ads?

Underground shows ads; Orbis Atomus does not.

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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.*