Sirens' Chor vs SimplyFlange
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sirens' Chor
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.
- Harmonic analysis of input audio
- Sine wave oscillator synthesis
- Adjustable chorus effect
- Second voice generation
- AUV3 plugin support
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This one is quite experimental and CPU heavy app! While working on my Chord Detector app I came up with the idea to play the found harmonics with sine wave oscillators so I can hear what the algorithm is hearing :) It turns out to be an interesting output that led me to creation of this audio effect app. What happens here is that the input is analysed for main harmonics in the range of 80Hz to 1500Hz. Then a series of sine wave oscillators are set to play those harmonics with the exact frequency and volume and their output is added to create a second voice. This second voice can then be mixed with the input to create some kind of chorus or played alone. All this is CPU heavy process so it should be used with care... Also to make this effect possible I had to use limited range 80Hz to 1500Hz so it is not suitable for every instrument and you have to keep that range in mind when producing. Some very fast volume and frequency changes are applied to the oscillators. The app is AUV3
SimplyFlange
This audio effect app provides a straightforward flange effect for a retro sound. It functions as an AUv3 app extension, compatible with hosts like AUM, Cubasis, and GarageBand.
- Retro flange audio effect
- AUv3 app extension
- Compatible with AUM, Cubasis, GarageBand
- Standalone app functionality
- Simple and straightforward interface
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A simple but straightforward flange audio effect to give you that nice retro feel. The filter exists in an AUv3 app extension so it is available for use in any host app that supports AudioUnit components such as AUM or Cubasis or GarageBand.
Screenshots
Verdict
The clearest difference is rating: SimplyFlange at 5.0 against Sirens' Chor's 4.0. SimplyFlange also leads on update cadence (every 9 days vs every 39 months) and price ($0.99 vs $3.99). Sirens' Chor's advantage is iOS requirement (10.0 vs 16.6). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Sirens' Chor costs $3.99 and SimplyFlange $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SimplyFlange holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Sirens' Chor ships an update every 39 months, SimplyFlange every 9 days. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.
| Parameter | Sirens' Chor | SimplyFlange |
|---|---|---|
| Price | $3.99 | $0.99 — better |
| Rating | 4.0 (2 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 39 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 10.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 11 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleksandar Mlazev | Brad Howes |
Customer experience
Sirens' Chor
SimplyFlange
In-app purchases
Sirens' Chor
No in-app purchases
SimplyFlange
No in-app purchases
