# Trompong vs PentaMonochord

The clearest difference is price: PentaMonochord at $1.99 against Trompong's $4.99. PentaMonochord also leads on iOS requirement (12.0 vs 18.0). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Trompong costs $4.99 and PentaMonochord $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Trompong ships an update every 33 months, PentaMonochord every 24 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Trompong | PentaMonochord |
| --- | --- | --- |
| Price | $4.99 | **$1.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pentamonochord/id1582880506/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 33 months | **Every 24 months** |
| Monetization | Paid | Paid |
| Size | 36 MB | 12 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [emacsian Company Limited](https://appshunter.io/developer/388819355) | [Lucy Hudson](https://appshunter.io/developer/1179157812) |

## What reviewers say

### Trompong

[App page](https://appshunter.io/ios/app/trompong/id673710232)

Experience the authentic sounds of Balinese Gamelan Gong Kebyar with this app. It features a row of 10 gongs, offering a realistic playing experience with high-quality sampled sounds and interactive controls. Explore detailed instrument views and customizable notation displays.

**Highlights:** Authentic sampled sound bank, Realistic playing experience, Ultra-low latency audio, Zoomable instrument views, Customizable cipher notation, Ad-free experience

**Features:** 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, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Trompong free?

Trompong costs $4.99, with no in-app purchases.

### Is PentaMonochord free?

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

### Do Trompong or PentaMonochord have ads?

Neither Trompong nor PentaMonochord shows ads.

### Which is updated more often, Trompong or PentaMonochord?

Trompong ships an update every 33 months, and PentaMonochord every 24 months. Most recently, Trompong was updated on November 1, 2026 and PentaMonochord on November 3, 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.*