# Opus vs Fluid Sonata

Opus and Fluid Sonata are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Opus sells 2 in-app purchases, starting at $5.99 per month and Fluid Sonata sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Opus | Fluid Sonata |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 130 MB | 5 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cyberic Limited](https://appshunter.io/developer/1874822564) | [Daniel Ehrlich](https://appshunter.io/developer/1892893228) |

## What reviewers say

### Opus

[App page](https://appshunter.io/ios/app/opus-classical-music-guide/id6758754835)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Annual | $49.99 | per year |


### Fluid Sonata

[App page](https://appshunter.io/ios/app/fluid-sonata-music-visualizer/id6798520653)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The Full Concert | $4.99 | one-time |


## Frequently asked questions

### Is Opus free?

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

### Is Fluid Sonata free?

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

### Do Opus or Fluid Sonata have ads?

Neither Opus nor Fluid Sonata shows ads.

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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.*