# Underisland vs Rocket Betsy

The clearest difference is update cadence: Underisland at every 4 days against Rocket Betsy's every 8 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Underisland sells 10 in-app purchases, starting at $4.99 per 7 days and Rocket Betsy sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Underisland ships an update every 4 days, Rocket Betsy every 8 days. The most recent releases landed on October 28, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Underisland | Rocket Betsy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 8 days |
| Size | 217 MB | 217 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Ruslan Abdullakh](https://appshunter.io/developer/1821467214) | [Magmic Inc.](https://appshunter.io/developer/302049357) |

## What reviewers say

### Underisland

[App page](https://appshunter.io/ios/app/underisland-mining-adventure/id6747443897)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Legends' Subscription | $4.99 | per 7 days |
| Planks | $0.99 | one-time |
| Planks | $3.99 | one-time |
| Starter Pack | $5.99 | one-time |
| Pile of Coins | $7.99 | one-time |
| Planks | $7.99 | one-time |
| Ingots | $7.99 | one-time |
| No Ads | $9.99 | one-time |
| Plenty of Magic Threads | $19.99 | one-time |
| Barrel of Gems | $19.99 | one-time |


### Rocket Betsy

[App page](https://appshunter.io/ios/app/rocket-betsy/id6754286209)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gem Pack 1 | $2.99 | one-time |
| Remove Ads - Sale | $2.99 | one-time |
| Remove Ads | $3.99 | one-time |
| Gem Pack 2 | $6.99 | one-time |
| Gem Pack 3 | $12.99 | one-time |
| Gem Pack 4 | $24.99 | one-time |


## Frequently asked questions

### Is Underisland free?

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

### Is Rocket Betsy free?

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

### Do Underisland or Rocket Betsy have ads?

Both Underisland and Rocket Betsy show ads.

### Which is updated more often, Underisland or Rocket Betsy?

Underisland ships an update every 4 days, and Rocket Betsy every 8 days. Most recently, Underisland was updated on October 28, 2026 and Rocket Betsy on October 30, 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.*