# FET Acoustic Compressor vs SL Prism

The clearest difference is price: FET Acoustic Compressor at $5.99 against SL Prism's $19.99. FET Acoustic Compressor also leads on iOS requirement (13.0 vs 15.0). SL Prism's advantage is update cadence (every 10 days vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

FET Acoustic Compressor costs $5.99 and SL Prism $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

FET Acoustic Compressor ships an update every 2 months, SL Prism every 10 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | FET Acoustic Compressor | SL Prism |
| --- | --- | --- |
| Price | **$5.99** | $19.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fet-acoustic-compressor/id6763790891/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Paid | — |
| Size | 9 MB | 18 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shelbybark LLC](https://appshunter.io/developer/1895490257) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### FET Acoustic Compressor

[App page](https://appshunter.io/ios/app/fet-acoustic-compressor/id6763790891)

This app emulates the warm, musical character of classic FET compressors for acoustic instruments and more. It offers intuitive controls for punch, presence, and glue, with a special "All-In" mode for aggressive sounds. Designed for mobile studios and live performance.

**Highlights:** Classic FET compression emulation, Voiced for acoustic guitar, versatile for other instruments, Intuitive controls: IN, ATTACK, RELEASE, RATIO, OUT, DRY, SC HPF, Special "All-In" mode for aggressive sounds, AUv3 plugin support for popular DAWs, Low latency for live performance, Factory presets included

**In-app purchases:** none


### SL Prism

[App page](https://appshunter.io/ios/app/sl-prism/id6806684924)

**In-app purchases:** none


## Frequently asked questions

### Is FET Acoustic Compressor free?

FET Acoustic Compressor costs $5.99, with no in-app purchases.

### Is SL Prism free?

SL Prism costs $19.99, with no in-app purchases.

### Do FET Acoustic Compressor or SL Prism have ads?

Neither FET Acoustic Compressor nor SL Prism shows ads.

### Which is updated more often, FET Acoustic Compressor or SL Prism?

FET Acoustic Compressor ships an update every 2 months, and SL Prism every 10 days. Most recently, FET Acoustic Compressor was updated on October 31, 2026 and SL Prism on October 31, 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.*