# Sirens' Chor vs MONSTR

The clearest difference is price: MONSTR at $1.99 against Sirens' Chor's $3.99. Sirens' Chor's advantage is iOS requirement (10.0 vs 12.0). On ads, in-app purchases and device support there is nothing between them.

Sirens' Chor costs $3.99 and MONSTR $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Sirens' Chor | MONSTR |
| --- | --- | --- |
| Price | $3.99 | **$1.99** |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | — |
| Monetization | Paid | — |
| Size | 11 MB | 8 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [Jack Devlin](https://appshunter.io/developer/1697186780) |

## 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


### MONSTR

[App page](https://appshunter.io/ios/app/monstr/id6749466088)

**In-app purchases:** none


## Frequently asked questions

### Is Sirens' Chor free?

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

### Is MONSTR free?

MONSTR costs $1.99, with no in-app purchases.

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

Neither Sirens' Chor nor MONSTR 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.*