# Delay Line vs P422 Fairuz

The clearest difference is price: Delay Line at $1.99 against P422 Fairuz's $19.99. P422 Fairuz's advantage is iOS requirement (15.0 vs 17.0). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Delay Line costs $1.99 and P422 Fairuz $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Delay Line against 5.0 for P422 Fairuz. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

## The numbers

| Metric | Delay Line | P422 Fairuz |
| --- | --- | --- |
| Price | **$1.99** | $19.99 |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/delay-line/id6776276739/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/p422-fairuz/id6801470405/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 5 days |
| Monetization | Paid | Paid |
| Size | 7 MB | 46 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Callback Audio, LLC](https://appshunter.io/developer/1896220942) | [Pulsar Modular](https://appshunter.io/developer/6793457903) |

## What reviewers say

### Delay Line

[App page](https://appshunter.io/ios/app/delay-line/id6776276739)

This audio effect app offers a high-quality digital delay with smooth parameter control for musical echoes. It's designed to add depth and space to your sound without unwanted noise.

**Highlights:** High-quality digital delay, Smooth parameter interpolation, Feedback control, Musical echoes, Linear interpolation for delay time, Comprehensive parameter smoothing

**Features:** Vision Pro support

**In-app purchases:** none


### P422 Fairuz

[App page](https://appshunter.io/ios/app/p422-fairuz/id6801470405)

This app offers a powerful four-band parametric equalizer with selectable curves and proportional Q for precise sound shaping. It emulates classic op-amp circuits, adding harmonic density and character, with features like a sub-bass circuit and input transformer control.

**Highlights:** Four op-amp EQ bands with Bell/Contour/Contour X2 shapes, Proportional Q for musical width, TREMOR sub-bass circuit, VOICE input transformer and HAMMER output stage saturation, Real-time spectrum analyzer, AUv3 plugin and standalone app

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Delay Line free?

Delay Line costs $1.99, with no in-app purchases.

### Is P422 Fairuz free?

P422 Fairuz costs $19.99, with no in-app purchases.

### Which has better reviews, Delay Line or P422 Fairuz?

Delay Line and P422 Fairuz are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Delay Line or P422 Fairuz have ads?

Neither Delay Line nor P422 Fairuz shows ads.

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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.*