# Cube App vs SereneSea

The clearest difference is in-app purchases: Cube App at none against SereneSea's 4. Cube App also leads on ads (none vs shown) and iOS requirement (11.0 vs 16.4). SereneSea's advantage is update cadence (every 6 days vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. SereneSea sells 4 in-app purchases, starting at $1.99 per month. Cube App asks for nothing beyond the download.

Cube App ships an update every 3 weeks, SereneSea every 6 days. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Cube App | SereneSea |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 77 MB | 144 MB |
| Requires iOS | **11.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Xerintel Internet Technologies S.L.](https://appshunter.io/developer/966518891) | [ZHAOWEI KE](https://appshunter.io/developer/6789619654) |

## What reviewers say

### Cube App

[App page](https://appshunter.io/ios/app/cube-app/id1630315233)

**Features:** macOS Compatibility

**In-app purchases:** none


### SereneSea

[App page](https://appshunter.io/ios/app/serenesea-reef-tank-journal/id6789619652)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| QuietSea VIP Monthly | $1.99 | per month |
| QuietSea VIP Yearly | $17.99 | per year |
| Lifetime VIP - Annual Plan | $7.99 | one-time |
| Lifetime VIP | $14.99 | one-time |


## Frequently asked questions

### Is Cube App free?

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

### Is SereneSea free?

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

### Do Cube App or SereneSea have ads?

SereneSea shows ads; Cube App does not.

### Which is updated more often, Cube App or SereneSea?

Cube App ships an update every 3 weeks, and SereneSea every 6 days. Most recently, Cube App was updated on November 3, 2026 and SereneSea 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.*