# EQ550 vs Kompresor

The clearest difference is price: EQ550 at Free against Kompresor's $24.99. EQ550 also leads on update cadence (monthly vs every 8 months) and iOS requirement (10.0 vs 15.8). Kompresor's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 1). On ratings volume, ads and device support there is nothing between them.

EQ550 is free to download; Kompresor costs $24.99 up front. EQ550 sells 1 one-off in-app purchase. Kompresor asks for nothing beyond the download.

Kompresor holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 11 and 4 respectively.

EQ550 ships an update monthly, Kompresor every 8 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | EQ550 | Kompresor |
| --- | --- | --- |
| Price | **Free** | $24.99 |
| Rating | [4.5 (11 ratings)](https://appshunter.io/ios/app/eq550/id1507132030/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/kompresor/id1572077067/reviews)** |
| Number of ratings | **11** | 4 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 8 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 20 MB | 4 MB |
| Requires iOS | **10.0** | 15.8 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RRS, OOO](https://appshunter.io/developer/1486125568) | [Shattered Glass Audio](https://appshunter.io/developer/1565520347) |

## What reviewers say

### EQ550

[App page](https://appshunter.io/ios/app/eq550/id1507132030)

This audio effect plugin emulates classic American EQs from the late 1960s, offering precise control over equalization with unique Proportional Q technology. It functions as a standalone app or an AUv3 plugin for compatible hosts, providing a flexible and characterful sound shaping experience.

**Highlights:** Standalone and AUv3 plugin, 3 bands of classic American equalization, Proportional Q filter bandwidth, Stereo, Mid, or Side EQ modes, Undo/Redo and A/B comparison, Scalable GUI

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RRS EQ550 Unlimited | $4.99 | one-time |


### Kompresor

[App page](https://appshunter.io/ios/app/kompresor/id1572077067)

This audio tool offers versatile compression with multiple algorithms and processing modes for various signals, from mix bus to mastering. It provides fine-tuning options like DELTA monitoring and external sidechaining for precise audio manipulation.

**Highlights:** Multiple compression algorithms, Five processing modes (stereo, mid, side, left, right), External sidechain input, DELTA monitoring, Fast attack time (0.01ms), Peak and RMS detectors, AUv3 plugin compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EQ550 free?

EQ550 is free to download, with in-app purchases available.

### Is Kompresor free?

Kompresor costs $24.99, with no in-app purchases.

### Which has better reviews, EQ550 or Kompresor?

Kompresor is rated higher. EQ550 averages 4.5 out of 5 from 11 ratings, while Kompresor averages 5.0 from 4 ratings.

### Do EQ550 or Kompresor have ads?

Neither EQ550 nor Kompresor shows ads.

### Which is updated more often, EQ550 or Kompresor?

EQ550 ships an update monthly, and Kompresor every 8 months. Most recently, EQ550 was updated on October 24, 2026 and Kompresor 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.*