# subflow vs Rainy Relax 4K

The clearest difference is price: subflow at Free against Rainy Relax 4K's $0.99. subflow also leads on in-app purchases (none vs 2) and update cadence (every 6 days vs every 3 months). On ads, device support and iOS requirement there is nothing between them.

subflow is free to download; Rainy Relax 4K costs $0.99 up front. Rainy Relax 4K sells 2 in-app purchases, starting at $0.99 per month. subflow asks for nothing beyond the download.

subflow ships an update every 6 days, Rainy Relax 4K every 3 months. The most recent releases landed on October 24, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | subflow | Rainy Relax 4K |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.3 (18 ratings)](https://appshunter.io/ios/app/subflow/id1570176211/reviews)** | — |
| Number of ratings | **18** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 3 months |
| Monetization | Free | — |
| Size | 3 MB | 59 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad, Apple TV | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Ello Skelling Productions](https://appshunter.io/developer/1569508906) | [KISSAPP, S.L.](https://appshunter.io/developer/552812711) |

## What reviewers say

### subflow

[App page](https://appshunter.io/ios/app/subflow/id1570176211)

Create dynamic music visualizations for any setting. Control modes, speed, and beat patterns with intuitive screen gestures. Advanced users can leverage UDP and OS2L for complex control with DJ software.

**Highlights:** Gesture-based control for modes, speed, and beats, Beat pattern customization, UDP command sequencing, OS2L integration with DJ software, Color customization via long press

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

**In-app purchases:** none


### Rainy Relax 4K

[App page](https://appshunter.io/ios/app/rainy-relax-4k/id6737191959)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rainy Relax Full Version | $0.99 | per month |
| Rainy Relax Full Version | $9.99 | per year |


## Frequently asked questions

### Is subflow free?

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

### Is Rainy Relax 4K free?

Rainy Relax 4K costs $0.99, and also offers in-app purchases.

### Do subflow or Rainy Relax 4K have ads?

Neither subflow nor Rainy Relax 4K shows ads.

### Which is updated more often, subflow or Rainy Relax 4K?

subflow ships an update every 6 days, and Rainy Relax 4K every 3 months. Most recently, subflow was updated on October 24, 2026 and Rainy Relax 4K on October 23, 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.*