# Rheoflow vs TheONE Sing

The clearest difference is in-app purchases: Rheoflow at none against TheONE Sing's 3. TheONE Sing's advantage is update cadence (every 3 weeks vs every 2 months) and iOS requirement (11.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. TheONE Sing sells 3 in-app purchases, starting at $19.99 per month. Rheoflow asks for nothing beyond the download.

Rheoflow ships an update every 2 months, TheONE Sing every 3 weeks. The most recent releases landed on October 5, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Rheoflow | TheONE Sing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (71 ratings)](https://appshunter.io/ios/app/theone-sing-play-in-3-mins/id6483105528/reviews)** |
| Number of ratings | — | **71** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 198 MB | 155 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳走心科技有限公司](https://appshunter.io/developer/1726558173) | [Xiaoyezi Beijing Technology Co., Ltd.](https://appshunter.io/developer/1271694597) |

## What reviewers say

### Rheoflow

[App page](https://appshunter.io/ios/app/rheoflow/id6476388045)

**In-app purchases:** none


### TheONE Sing

[App page](https://appshunter.io/ios/app/theone-sing-play-in-3-mins/id6483105528)

Learn to play and sing your favorite songs on the piano in just 3 minutes by following guiding lights. This app allows you to express yourself through music, offering an intuitive way to unlock melodies and rhythms.

**Highlights:** Follow guiding lights to play piano, Sing along to songs, Extensive song library, Intuitive musical expression, Learn melodies and rhythms, 3-minute song learning

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $19.99 | per month |
| 3 Months | $59.99 | per 3 months |
| 12 Months | $119.99 | per year |


## Frequently asked questions

### Is Rheoflow free?

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

### Is TheONE Sing free?

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

### Do Rheoflow or TheONE Sing have ads?

Neither Rheoflow nor TheONE Sing shows ads.

### Which is updated more often, Rheoflow or TheONE Sing?

Rheoflow ships an update every 2 months, and TheONE Sing every 3 weeks. Most recently, Rheoflow was updated on October 5, 2026 and TheONE Sing on October 24, 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.*