# Sirens' Chor vs OttavaBassa

The clearest difference is iOS requirement: Sirens' Chor at 10.0 against OttavaBassa's 13.0. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | Sirens' Chor | OttavaBassa |
| --- | --- | --- |
| Price | $3.99 | $3.99 |
| 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 | 18 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [Rob Jackson](https://appshunter.io/developer/1072346998) |

## 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


### OttavaBassa

[App page](https://appshunter.io/ios/app/ottavabassa/id6803481561)

**In-app purchases:** none


## Frequently asked questions

### Is Sirens' Chor free?

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

### Is OttavaBassa free?

OttavaBassa costs $3.99, with no in-app purchases.

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

Neither Sirens' Chor nor OttavaBassa shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*