# Opson Pro vs Aqualis

The clearest difference is in-app purchases: Opson Pro at none against Aqualis's 4. Opson Pro also leads on ads (none vs shown) and iOS requirement (12.0 vs 26.0). Aqualis's advantage is update cadence (every 3 days vs every 2 weeks). On price and device support there is nothing between them.

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

Opson Pro ships an update every 2 weeks, Aqualis every 3 days. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Opson Pro | Aqualis |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 8 MB | 21 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [WYBOTICS CO.,LTD](https://appshunter.io/developer/1035099187) | [vincent riga](https://appshunter.io/developer/1886503437) |

## What reviewers say

### Opson Pro

[App page](https://appshunter.io/ios/app/opson-pro/id1607262123)

**Features:** macOS Compatibility

**In-app purchases:** none


### Aqualis

[App page](https://appshunter.io/ios/app/aqualis/id6787792740)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Aqualis Pro | $1.99 | per month |
| Aqualis Pro Quarterly | $3.99 | per 3 months |
| Aqualis Pro | $12.99 | per year |
| Aqualis Pro — Lifetime | $34.99 | one-time |


## Frequently asked questions

### Is Opson Pro free?

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

### Is Aqualis free?

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

### Do Opson Pro or Aqualis have ads?

Aqualis shows ads; Opson Pro does not.

### Which is updated more often, Opson Pro or Aqualis?

Opson Pro ships an update every 2 weeks, and Aqualis every 3 days. Most recently, Opson Pro was updated on October 12, 2026 and Aqualis on October 6, 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.*