# AUFX vs Comp 609

The clearest difference is price: Comp 609 at Free against AUFX's $4.99. Comp 609 also leads on rating (4.8 vs 4.3) and review sentiment (88% vs 66%). AUFX's advantage is in-app purchases (none vs 1). On ratings volume, update cadence, ads and device support there is nothing between them.

Comp 609 is free to download; AUFX costs $4.99 up front. Comp 609 sells 1 one-off in-app purchase. AUFX asks for nothing beyond the download.

Comp 609 holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 32 and 25 respectively. Written reviews point the same way: 66% of AUFX's written reviews are positive against 88% of Comp 609's.

AUFX ships an update every 5 months, Comp 609 every 7 months. The most recent releases landed on October 9, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | AUFX | Comp 609 |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.3 (32 ratings)](https://appshunter.io/ios/app/aufxpush/id958106165/reviews) | **[4.8 (25 ratings)](https://appshunter.io/ios/app/comp-609/id1514569444/reviews)** |
| Number of ratings | **32** | 25 |
| Positive reviews | 65.8% of reviews | **87.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 7 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 21 MB |
| Requires iOS | **9.0** | 10.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kymatica AB](https://appshunter.io/developer/522046659) | [RRS, OOO](https://appshunter.io/developer/1486125568) |

## What reviewers say

### AUFX

[App page](https://appshunter.io/ios/app/aufxpush/id958106165)

This app offers a versatile stereo dynamics processor with advanced features like a noise gate, compressor/expander, and limiter. It allows for a wide range of audio manipulation, from subtle adjustments to extreme effects, with external side-chain capabilities and high-quality DSP.

**Highlights:** Stereo dynamics processor, Noise gate, Compressor/expander, External side-chain input, Lookahead limiter, High quality 32-bit DSP

**Features:** Vision Pro support

**In-app purchases:** none


### Comp 609

[App page](https://appshunter.io/ios/app/comp-609/id1514569444)

This audio effect plugin emulates analog compressors, offering extensive control over attack, release, ratio, and saturation. It supports various operation modes, external sidechaining, and parallel compression for detailed audio shaping. A demo version is available with a time limit.

**Highlights:** Analog compressor emulation, Adjustable attack, release, and ratio, External sidechain with high-pass filter, Multiple operation modes (M/S, Stereo, Mono), Parallel compression, Oversampling and 64-bit processing, Scalable GUI

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RRS Comp 609 Unlimited | $4.99 | one-time |


## Frequently asked questions

### Is AUFX free?

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

### Is Comp 609 free?

Comp 609 is free to download, with in-app purchases available.

### Which has better reviews, AUFX or Comp 609?

Comp 609 is rated higher. AUFX averages 4.3 out of 5 from 32 ratings, while Comp 609 averages 4.8 from 25 ratings.

### Do AUFX or Comp 609 have ads?

Neither AUFX nor Comp 609 shows ads.

### Which is updated more often, AUFX or Comp 609?

AUFX ships an update every 5 months, and Comp 609 every 7 months. Most recently, AUFX was updated on October 9, 2026 and Comp 609 on September 30, 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.*