Sirens' Chor vs oVerlegato
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
oVerlegato
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Concept: The app is AUv3 MIDI effect and works as “Legato” effect for MIDI instruments using pitchBend. System Requirements: 1. AUv3 host 2. 3rd-party MIDI instrument that has a functionality of pitchBend. Usage: One important calibration 1. Adjust oVerlegato’s pitchBend range to the same value as the one of destination instrument, otherwise it becomes microtonal. There are two buttons & two sliders. 1. “Legato”: it becomes legato mode only while pushing the button. 2. “Channel”: determines MIDI output channel. 3. “pitchBend range”: oVerlegato’s internal pitchBend range (from 12 to 48).” 4. “Panic!”: sends all noteOff message. When notes are accidentally stacked, push this button while pushing any key of keyboard. The rule of playing legato It needs to sustain the first initial note while pushing “Legato”button until the legato sequence ends. Scheme: oVerlegato (MIDI out) -> 3rd-party instrument
Screenshots
Verdict
The clearest difference is update cadence: oVerlegato at every 6 months against Sirens' Chor's every 39 months. oVerlegato also leads on price ($2.99 vs $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.
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 oVerlegato $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Sirens' Chor ships an update every 39 months, oVerlegato every 6 months. The most recent releases landed on November 7, 2026 and October 28, 2026 respectively.
| Parameter | Sirens' Chor | oVerlegato |
|---|---|---|
| Price | $3.99 | $2.99 — better |
| Rating | 4.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 39 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 11 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleksandar Mlazev | Satoshi Kajii |
In-app purchases
Sirens' Chor
No in-app purchases
oVerlegato
No in-app purchases









