# Sirens' Chor vs Sound

The clearest difference is price: Sound at Free against Sirens' Chor's $3.99. Sound also leads on rating (5.0 vs 4.0) and update cadence (every 2 months vs every 39 months). Sirens' Chor's advantage is iOS requirement (10.0 vs 15.1). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Sound is free to download; Sirens' Chor costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sound holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Sirens' Chor ships an update every 39 months, Sound every 2 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sirens' Chor | Sound |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/sound-shield/id6760803417/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 11 MB | 43 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [Thomas Soter](https://appshunter.io/developer/1886319290) |

## What reviewers say

### Sirens' Chor

[App page](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812)

This experimental audio effect app analyzes input audio to generate a secondary harmonic voice using sine wave oscillators. The generated voice can be mixed with the original or played solo, creating a chorus effect. It's CPU intensive and operates within a specific frequency range.

**Highlights:** Harmonic analysis of input audio, Sine wave oscillator synthesis, Adjustable chorus effect, Second voice generation, AUV3 plugin support

**Features:** Vision Pro support

**In-app purchases:** none


### Sound

[App page](https://appshunter.io/ios/app/sound-shield/id6760803417)

This application helps you block out distracting noises using basic wired headphones. It's designed to improve focus and productivity without requiring expensive equipment.

**Highlights:** Noise cancellation, Works with wired headphones, Improves focus, Affordable solution

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sirens' Chor free?

Sirens' Chor costs $3.99, with no in-app purchases.

### Is Sound free?

Sound is free to download, with no in-app purchases.

### Which has better reviews, Sirens' Chor or Sound?

Sound is rated higher. Sirens' Chor averages 4.0 out of 5 from 2 ratings, while Sound averages 5.0 from 4 ratings.

### Do Sirens' Chor or Sound have ads?

Neither Sirens' Chor nor Sound shows ads.

### Which is updated more often, Sirens' Chor or Sound?

Sirens' Chor ships an update every 39 months, and Sound every 2 months. Most recently, Sirens' Chor was updated on October 24, 2026 and Sound 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.*