# Rejuvenation Science vs Harmony Playground

The clearest difference is in-app purchases: Rejuvenation Science at none against Harmony Playground's 4. Harmony Playground's advantage is ads (none vs shown) and update cadence (fortnightly vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Harmony Playground sells 4 in-app purchases, starting at $14.00 per month. Rejuvenation Science asks for nothing beyond the download.

Rejuvenation Science ships an update every 5 months, Harmony Playground fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Rejuvenation Science | Harmony Playground |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/harmony-playground/id6739337437/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | — | Freemium |
| Size | 75 MB | 499 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Douglas De Becker](https://appshunter.io/developer/1705887052) | [Harmony Playground Co. LLC](https://appshunter.io/developer/1784918363) |

## What reviewers say

### Rejuvenation Science

[App page](https://appshunter.io/ios/app/rejuvenation-science/id6464392504)

**Features:** macOS Compatibility

**In-app purchases:** none


### Harmony Playground

[App page](https://appshunter.io/ios/app/harmony-playground/id6739337437)

This app offers healing music, soundscapes, and meditations designed to enhance well-being. It utilizes advanced audio technology and human-composed tracks to improve focus, sleep, and energy levels. It's suitable for individual use and for professionals supporting client healing spaces.

**Highlights:** Immersive 3D Spatial Audio, Psychoacoustic sound design, Human-composed healing tracks, Customizable playlists, Commercial use licensing, Environmental donations

**Features:** Apple Wallet, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essential Monthly | $14.00 | per month |
| Pro Monthly | $36.00 | per month |
| Essential Yearly | $139.00 | per year |
| Pro Yearly | $359.00 | per year |


## Frequently asked questions

### Is Rejuvenation Science free?

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

### Is Harmony Playground free?

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

### Do Rejuvenation Science or Harmony Playground have ads?

Rejuvenation Science shows ads; Harmony Playground does not.

### Which is updated more often, Rejuvenation Science or Harmony Playground?

Rejuvenation Science ships an update every 5 months, and Harmony Playground fortnightly. Most recently, Rejuvenation Science was updated on November 3, 2026 and Harmony Playground on October 30, 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.*