# ACM interactions vs Nebulae

The clearest difference is in-app purchases: ACM interactions at none against Nebulae's 1. ACM interactions also leads on ads (none vs shown) and iOS requirement (10.2 vs 13.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Nebulae sells 1 one-off in-app purchase. ACM interactions asks for nothing beyond the download.

ACM interactions ships an update every 14 months, Nebulae every 22 months. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ACM interactions | Nebulae |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 14 months** | Every 22 months |
| Size | 21 MB | 1.3 GB |
| Requires iOS | **10.2** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Association for Computing Machinery](https://appshunter.io/developer/405041865) | [Alparslan Topbas](https://appshunter.io/developer/1130875171) |

## What reviewers say

### ACM interactions

[App page](https://appshunter.io/ios/app/acm-interactions/id615463454)

**Features:** macOS Compatibility

**In-app purchases:** none


### Nebulae

[App page](https://appshunter.io/ios/app/nebulae-magnificent/id1630662903)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nebulae: Magnificent - AdFree | $0.99 | one-time |


## Frequently asked questions

### Is ACM interactions free?

ACM interactions is free to download, with no in-app purchases.

### Is Nebulae free?

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

### Do ACM interactions or Nebulae have ads?

Nebulae shows ads; ACM interactions does not.

### Which is updated more often, ACM interactions or Nebulae?

ACM interactions ships an update every 14 months, and Nebulae every 22 months. Most recently, ACM interactions was updated on October 26, 2026 and Nebulae 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.*