# Sunja vs Sapling Isle

The clearest difference is in-app purchases: Sapling Isle at none against Sunja's 2. Sapling Isle also leads on ads (none vs shown) and update cadence (fortnightly vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Sunja sells 2 in-app purchases, starting at $29.99 per month. Sapling Isle asks for nothing beyond the download.

Sunja ships an update every 5 months, Sapling Isle fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sunja | Sapling Isle |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Fortnightly** |
| Size | 70 MB | 40 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sunja Labs Private Limited](https://appshunter.io/developer/1774734869) | [大鹏 张](https://appshunter.io/developer/937718061) |

## What reviewers say

### Sunja

[App page](https://appshunter.io/ios/app/sunja-interactive-3d-science/id6760365462)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Learning | $29.99 | per month |
| Annual Learning | $199.99 | per year |


### Sapling Isle

[App page](https://appshunter.io/ios/app/sapling-isle-physics-lab/id6792211746)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sunja free?

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

### Is Sapling Isle free?

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

### Do Sunja or Sapling Isle have ads?

Sunja shows ads; Sapling Isle does not.

### Which is updated more often, Sunja or Sapling Isle?

Sunja ships an update every 5 months, and Sapling Isle fortnightly. Most recently, Sunja was updated on October 24, 2026 and Sapling Isle on October 25, 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.*