Sirens' Chor vs D
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
D
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D-Chorus is a BBD-style spatial chorus for iPhone and iPad. Use it as a standalone audio app or insert the included AUv3 effect in a compatible host such as GarageBand. Designed for width with minimal audible pitch wobble, D-Chorus combines very slow, shallow modulation with opposite-phase left and right movement. Its four modes range from subtle widening to a deep, expansive chorus that feels more like space than an obvious sweep. FEATURES - Four vintage spatial-chorus modes - Opposite-phase left and right modulation - Equal-power Depth dry/wet blending - Width control from mono to hyper-wide - Adjustable input gain from -12 to +12 dB - BBD-style delay and compander behavior - Optional 2x and 4x oversampling - Standalone iOS/iPadOS app - AUv3 audio effect for compatible hosts TRY BEFORE UNLOCKING The app provides 10 minutes of full-featured active use, shared between the standalone app and AUv3 extension. Demo time advances only while audio is actively processing. A one-time, non-consumable In-App Purchase unlocks unlimited use in both formats. Restore Purchases is available in the standalone app. D-Chorus is suited to synthesizers, guitars, vocals, electric piano, and pads that need stable dimension and stereo depth.
Screenshots
Verdict
The clearest difference is price: D at Free against Sirens' Chor's $3.99. Sirens' Chor's advantage is in-app purchases (none vs 1) and iOS requirement (10.0 vs 16.0). On ads 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
D is free to download; Sirens' Chor costs $3.99 up front. D sells 1 one-off in-app purchase. Sirens' Chor asks for nothing beyond the download.
| Parameter | Sirens' Chor | D |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 39 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 11 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleksandar Mlazev | Shoma Kondo |
In-app purchases
Sirens' Chor
No in-app purchases
D
- D-Chorus Full Version$4.99








