# UnderAttack vs Stellar Outpost

The clearest difference is in-app purchases: Stellar Outpost at none against UnderAttack's 9. Stellar Outpost also leads on update cadence (every 4 days vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. UnderAttack sells 9 one-off in-app purchases. Stellar Outpost asks for nothing beyond the download.

UnderAttack ships an update every 4 months, Stellar Outpost every 4 days. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | UnderAttack | Stellar Outpost |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/stellar-outpost/id6791397616/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | — | Ad-supported |
| Size | 88 MB | 13 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [OGULCAN SACLI](https://appshunter.io/developer/1855149869) | [HOTTEST DROPS LLC](https://appshunter.io/developer/6791397619) |

## What reviewers say

### UnderAttack

[App page](https://appshunter.io/ios/app/underattack-idle-td/id6756351933)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 Gem | $0.99 | one-time |
| 130 Gem | $1.99 | one-time |
| Starter Pack | $2.99 | one-time |
| Adventurer Bundle | $4.99 | one-time |
| 350 Gem | $4.99 | one-time |
| 650 Gem | $7.99 | one-time |
| Veteran Pack | $9.99 | one-time |
| Dreadnought | $9.99 | one-time |
| 1500 Gem | $14.99 | one-time |


### Stellar Outpost

[App page](https://appshunter.io/ios/app/stellar-outpost/id6791397616)

Build a space mining empire by tapping to mine stardust and automating production with drones and space stations. Earn rewards offline and prestige for permanent boosts as your empire scales.

**Highlights:** Tap to mine stardust, Automate production with drones, Upgrade to space stations, Offline earnings, Prestige system for boosts, Bonus comet rewards

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

**In-app purchases:** none


## Frequently asked questions

### Is UnderAttack free?

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

### Is Stellar Outpost free?

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

### Do UnderAttack or Stellar Outpost have ads?

Both UnderAttack and Stellar Outpost show ads.

### Which is updated more often, UnderAttack or Stellar Outpost?

UnderAttack ships an update every 4 months, and Stellar Outpost every 4 days. Most recently, UnderAttack was updated on October 6, 2026 and Stellar Outpost on October 11, 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.*