# Keyboard Collection vs Sirens' Chor

The clearest difference is rating: Keyboard Collection at 4.8 against Sirens' Chor's 4.0. Keyboard Collection also leads on update cadence (every 4 months vs every 39 months) and price ($0.99 vs $3.99). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

Keyboard Collection costs $0.99 and Sirens' Chor $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Keyboard Collection holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Keyboard Collection ships an update every 4 months, Sirens' Chor every 39 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Keyboard Collection | Sirens' Chor |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/keyboard-collection/id1425485937/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 39 months |
| Monetization | Paid | Paid |
| Size | 61 MB | 11 MB |
| Requires iOS | **8.0** | 10.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Robert Swinburn](https://appshunter.io/developer/1425485936) | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) |

## What reviewers say

### Keyboard Collection

[App page](https://appshunter.io/ios/app/keyboard-collection/id1425485937)

Practice playing piano, electric piano, and harpsichord on your mobile device. Features realistic instrument models, 4-octave keyboards, and multitouch support for chords.

**Highlights:** Realistic instrument models, Interactive 3D view, 4-octave keyboards, Multitouch for chords, Authentic polyphonic sound, Optional note overlay

**Features:** Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Keyboard Collection free?

Keyboard Collection costs $0.99, with no in-app purchases.

### Is Sirens' Chor free?

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

### Which has better reviews, Keyboard Collection or Sirens' Chor?

Keyboard Collection is rated higher. Keyboard Collection averages 4.8 out of 5 from 4 ratings, while Sirens' Chor averages 4.0 from 2 ratings.

### Do Keyboard Collection or Sirens' Chor have ads?

Neither Keyboard Collection nor Sirens' Chor shows ads.

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

Keyboard Collection ships an update every 4 months, and Sirens' Chor every 39 months. Most recently, Keyboard Collection was updated on November 6, 2026 and Sirens' Chor on November 7, 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.*