# Rhythm+ vs PentaMonochord

The clearest difference is price: PentaMonochord at $1.99 against Rhythm+'s $8.99. Rhythm+'s advantage is update cadence (every 2 months vs every 24 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Rhythm+ costs $8.99 and PentaMonochord $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rhythm+ ships an update every 2 months, PentaMonochord every 24 months. The most recent releases landed on September 24, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Rhythm+ | PentaMonochord |
| --- | --- | --- |
| Price | $8.99 | **$1.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pentamonochord/id1582880506/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 24 months |
| Monetization | — | Paid |
| Size | 24 MB | 12 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Berserk Software AS](https://appshunter.io/developer/1475170649) | [Lucy Hudson](https://appshunter.io/developer/1179157812) |

## What reviewers say

### Rhythm+

[App page](https://appshunter.io/ios/app/rhythm-plus/id1475170650)

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

**In-app purchases:** none


### PentaMonochord

[App page](https://appshunter.io/ios/app/pentamonochord/id1582880506)

Explore the relationship between pitch and string length with a digital monochord. Build scales, hear intervals, and learn about Pythagorean music theory through interactive blocks and historical context.

**Highlights:** Build two-octave G pentatonic scales, Hear and see interval relationships, View Hertz frequencies and string lengths, Play pentatonic tunes, Scale-building game mode, Background information on monochord system, Historical timeline

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rhythm+ free?

Rhythm+ costs $8.99, with no in-app purchases.

### Is PentaMonochord free?

PentaMonochord costs $1.99, with no in-app purchases.

### Do Rhythm+ or PentaMonochord have ads?

Neither Rhythm+ nor PentaMonochord shows ads.

### Which is updated more often, Rhythm+ or PentaMonochord?

Rhythm+ ships an update every 2 months, and PentaMonochord every 24 months. Most recently, Rhythm+ was updated on September 24, 2026 and PentaMonochord on September 11, 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.*