# zigfred vs Acro Reef

The clearest difference is in-app purchases: zigfred at none against Acro Reef's 1. zigfred also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (12.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Acro Reef sells 1 one-off in-app purchase. zigfred asks for nothing beyond the download.

zigfred ships an update every 3 weeks, Acro Reef every 2 months. The most recent releases landed on September 23, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | zigfred | Acro Reef |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 58 MB | 3 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siglis AG](https://appshunter.io/developer/1535923846) | [Chih Han Lin](https://appshunter.io/developer/1800248325) |

## What reviewers say

### zigfred

[App page](https://appshunter.io/ios/app/zigfred/id1535923844)

**Features:** macOS Compatibility

**In-app purchases:** none


### Acro Reef

[App page](https://appshunter.io/ios/app/acro-reef-tank-tracker/id6774006301)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Acro Pro | $5.99 | one-time |


## Frequently asked questions

### Is zigfred free?

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

### Is Acro Reef free?

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

### Do zigfred or Acro Reef have ads?

Neither zigfred nor Acro Reef shows ads.

### Which is updated more often, zigfred or Acro Reef?

zigfred ships an update every 3 weeks, and Acro Reef every 2 months. Most recently, zigfred was updated on September 23, 2026 and Acro Reef on September 19, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*