# DRM vs Sirens' Chor

The clearest difference is review sentiment: Sirens' Chor at 100% against DRM's 38%. Sirens' Chor also leads on rating (4.0 vs 3.7) and iOS requirement (10.0 vs 12.0). DRM's advantage is update cadence (every 7 months vs every 39 months) and price ($0.99 vs $3.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

DRM 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 3.7. That said, the two scores are not equally well evidenced: DRM has 12 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 38% of DRM's written reviews are positive against 100% of Sirens' Chor's.

DRM ships an update every 7 months, Sirens' Chor every 39 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | DRM | Sirens' Chor |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | [3.7 (12 ratings)](https://appshunter.io/ios/app/drm-16/id1489333688/reviews) | **[4.0 (2 ratings)](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812/reviews)** |
| Number of ratings | **12** | 2 |
| Positive reviews | 38.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 39 months |
| Monetization | Paid | Paid |
| Size | 23 MB | 11 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Rochaix](https://appshunter.io/developer/1441966350) | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) |

## What reviewers say

### DRM

[App page](https://appshunter.io/ios/app/drm-16/id1489333688)

This app emulates a vintage 1978 drum machine, offering a pocket beat-making companion with a pure, distraction-free interface. It includes original samples, preset patterns, and various instrument and audio effects.

**Highlights:** 8 original high-quality double-samples, 16 preset patterns, Selective instrument deletion modes, Commutable 'Spacedrum' instrument, Full machine state auto-save, Background audio playback, Audiobus V3 and InterApp audio support

**Features:** macOS Compatibility, 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 DRM free?

DRM 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, DRM or Sirens' Chor?

Sirens' Chor is rated higher. DRM averages 3.7 out of 5 from 12 ratings, while Sirens' Chor averages 4.0 from 2 ratings.

### Do DRM or Sirens' Chor have ads?

Neither DRM nor Sirens' Chor shows ads.

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

DRM ships an update every 7 months, and Sirens' Chor every 39 months. Most recently, DRM was updated on October 24, 2026 and Sirens' Chor on October 24, 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.*