# Undersong vs FIELD KIT Playback Engine

The clearest difference is update cadence: Undersong at daily against FIELD KIT Playback Engine's every 2 weeks. Undersong also leads on rating (5.0 vs 4.6). FIELD KIT Playback Engine's advantage is chart position (#180 vs unranked) and iOS requirement (15.0 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Undersong costs $9.99 and FIELD KIT Playback Engine $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Undersong holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 11 and 5 respectively.

Undersong ships an update daily, FIELD KIT Playback Engine every 2 weeks. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Undersong | FIELD KIT Playback Engine |
| --- | --- | --- |
| Price | $9.99 | $9.99 |
| Rating | **[5.0 (11 ratings)](https://appshunter.io/ios/app/undersong/id6802013758/reviews)** | [4.6 (5 ratings)](https://appshunter.io/ios/app/field-kit-playback-engine/id6810484807/reviews) |
| Number of ratings | **11** | 5 |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 weeks |
| Monetization | Paid | Paid |
| Best chart rank | — | **#180** |
| Size | 19 MB | 12 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ian johnston](https://appshunter.io/developer/1886071653) | [Field Tone Audio, LLC](https://appshunter.io/developer/1891479237) |

## 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


### FIELD KIT Playback Engine

[App page](https://appshunter.io/ios/app/field-kit-playback-engine/id6810484807)

**Currently charting:** #180 Top Paid · Music (US App Store)

Transform audio recordings into evolving textures, rhythms, and atmospheres. Create up to four independent playback windows with customizable speed, direction, and effects. Explore new sonic material from your recordings.

**Highlights:** Up to four independent playback windows, Variable playback speed and direction, Drive and filtering per window, Routable modulation sources, Save and recall .fieldkit files, Standalone app and AUv3 Audio Unit

**In-app purchases:** none


## Frequently asked questions

### Is Undersong free?

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

### Is FIELD KIT Playback Engine free?

FIELD KIT Playback Engine costs $9.99, with no in-app purchases.

### Which has better reviews, Undersong or FIELD KIT Playback Engine?

Undersong is rated higher. Undersong averages 5.0 out of 5 from 11 ratings, while FIELD KIT Playback Engine averages 4.6 from 5 ratings.

### Do Undersong or FIELD KIT Playback Engine have ads?

Neither Undersong nor FIELD KIT Playback Engine shows ads.

### Which is updated more often, Undersong or FIELD KIT Playback Engine?

Undersong ships an update daily, and FIELD KIT Playback Engine every 2 weeks. Most recently, Undersong was updated on October 25, 2026 and FIELD KIT Playback Engine on October 26, 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.*