Stylusphone 3D vs Sirens' Chor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stylusphone 3D
Experience a virtual pocket synthesizer inspired by 1970s electronic keyboards. Enjoy authentic polyphonic sound with multiple waveforms and customizable retro body styles. This app offers an interactive 3D view and optional note overlays for a nostalgic musical journey.
- Realistic pocket synthesizer model
- Interactive 3D view
- Authentic polyphonic sound
- 3 different waveforms
- Choice of retro body styles
- Optional note overlay
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Recreate your childhood with a modern take on a classic. Inspired by the pocket synthesizers of the 1970's, this virtual electronic keyboard instrument expands on it to offer 3 different waveform sounds and 3 retro body styles. Features: * Realistic pocket synthesizer model * Interactive 3D view * Authentic polyphonic sound with 3 different waveforms * High or low octave selection * Choice of body styles * Optional note overlay * No Ads or In App Purchases
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
Screenshots
Verdict
The clearest difference is review sentiment: Sirens' Chor at 100% against Stylusphone 3D's 40%. Sirens' Chor also leads on rating (4.0 vs 3.0). Stylusphone 3D's advantage is price ($0.99 vs $3.99) and update cadence (every 16 months vs every 39 months). On ratings volume, ads, in-app purchases and monetization model 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
Stylusphone 3D costs $0.99 and Sirens' Chor $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Sirens' Chor holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 40% of Stylusphone 3D's written reviews are positive against 100% of Sirens' Chor's.
Stylusphone 3D ships an update every 16 months, Sirens' Chor every 39 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.
| Parameter | Stylusphone 3D | Sirens' Chor |
|---|---|---|
| Price | $0.99 — better | $3.99 |
| Rating | 3.0 (2 ratings) | 4.0 (2 ratings) — better |
| Positive reviews | 40.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 2 |
| Update frequency | Every 16 months — better | Every 39 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 10.0 |
| Further details — not scored | ||
| Size | 61 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Robert Swinburn | Aleksandar Mlazev |
Customer experience
Stylusphone 3D
Sirens' Chor
In-app purchases
Stylusphone 3D
No in-app purchases
Sirens' Chor
No in-app purchases
