# Undersong vs Sound Terrain

The clearest difference is price: Sound Terrain at $1.99 against Undersong's $9.99. Sound Terrain also leads on iOS requirement (15.0 vs 17.0). Undersong's advantage is update cadence (daily vs every 11 days). On ads, in-app purchases and device support there is nothing between them.

Undersong costs $9.99 and Sound Terrain $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Undersong ships an update daily, Sound Terrain every 11 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Undersong | Sound Terrain |
| --- | --- | --- |
| Price | $9.99 | **$1.99** |
| Rating | **[5.0 (11 ratings)](https://appshunter.io/ios/app/undersong/id6802013758/reviews)** | — |
| Number of ratings | **11** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 11 days |
| Monetization | Paid | — |
| Size | 19 MB | 3 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ian johnston](https://appshunter.io/developer/1886071653) | [弢 张](https://appshunter.io/developer/6773991027) |

## What reviewers say

### Undersong

[App page](https://appshunter.io/ios/app/undersong/id6802013758)

This audio effect acts like an instrument, generating synthesized notes in key based on incoming audio. Explore a vast array of sound combinations with various materials, modes, and patterns for unique ambient performances.

**Highlights:** Generates in-key synthesized notes from audio input, 12 material types and 10 performance modes, 10 pattern options for sound shaping, Self-generating ambient pad mode, Gravity feature for melodic anchoring, Customizable scales and root notes, Integrated reverb effect

**In-app purchases:** none


### Sound Terrain

[App page](https://appshunter.io/ios/app/sound-terrain/id6812715636)

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

**In-app purchases:** none


## Frequently asked questions

### Is Undersong free?

Undersong costs $9.99, with no in-app purchases.

### Is Sound Terrain free?

Sound Terrain costs $1.99, with no in-app purchases.

### Do Undersong or Sound Terrain have ads?

Neither Undersong nor Sound Terrain shows ads.

### Which is updated more often, Undersong or Sound Terrain?

Undersong ships an update daily, and Sound Terrain every 11 days. Most recently, Undersong was updated on October 29, 2026 and Sound Terrain 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.*