# Sirens' Chor vs FlangeII

The clearest difference is rating: FlangeII at 5.0 against Sirens' Chor's 4.0. FlangeII also leads on update cadence (every 6 days vs every 39 months) and price ($1.99 vs $3.99). Sirens' Chor's advantage is iOS requirement (10.0 vs 12.0). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

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

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

Sirens' Chor ships an update every 39 months, FlangeII every 6 days. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Sirens' Chor | FlangeII |
| --- | --- | --- |
| Price | $3.99 | **$1.99** |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flangeii/id6751889588/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 6 days** |
| Monetization | Paid | Paid |
| Size | 11 MB | 13 MB |
| Requires iOS | **10.0** | 12.0 |
| 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


### FlangeII

[App page](https://appshunter.io/ios/app/flangeii/id6751889588)

This audio effect plugin offers a dual stereo flanger with a vintage sound. It provides flexible routing options like parallel and series, alongside adjustable rate, depth, width, and drive for a wide range of modulated effects. Soft limiting is included to prevent clipping.

**Highlights:** Dual stereo flanging, Vintage vibe, Parallel and series routing, Adjustable rate and depth, Stereo width control, Optional drive for warmth, Soft limiting for clipping prevention

**In-app purchases:** none


## Frequently asked questions

### Is Sirens' Chor free?

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

### Is FlangeII free?

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

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

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

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

Neither Sirens' Chor nor FlangeII shows ads.

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

Sirens' Chor ships an update every 39 months, and FlangeII every 6 days. Most recently, Sirens' Chor was updated on November 7, 2026 and FlangeII on October 30, 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.*