# Electro Siren vs VAPolyMk4

The clearest difference is review sentiment: VAPolyMk4 at 100% against Electro Siren's 35%. VAPolyMk4 also leads on rating (5.0 vs 2.7) and update cadence (every 2 months vs every 5 months). Electro Siren's advantage is ratings volume (18 vs 2) and price ($2.99 vs $3.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

Electro Siren costs $2.99 and VAPolyMk4 $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

VAPolyMk4 holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: Electro Siren has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 35% of Electro Siren's written reviews are positive against 100% of VAPolyMk4's.

Electro Siren ships an update every 5 months, VAPolyMk4 every 2 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Electro Siren | VAPolyMk4 |
| --- | --- | --- |
| Price | **$2.99** | $3.99 |
| Rating | [2.7 (18 ratings)](https://appshunter.io/ios/app/electro-siren/id645217265/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/vapolymk4/id6753038075/reviews)** |
| Number of ratings | **18** | 2 |
| Positive reviews | 34.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 23 MB | 20 MB |
| Requires iOS | **12.1** | 16.6 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Sawa Digital LLC](https://appshunter.io/developer/307147848) | [Ryo Togawa](https://appshunter.io/developer/1474193056) |

## What reviewers say

### Electro Siren

[App page](https://appshunter.io/ios/app/electro-siren/id645217265)

This app provides a powerful DJ toolkit for electronic music enthusiasts. Access over 1000 radio stations and apply a variety of real-time effects and sound generators to your music library or streams.

**Highlights:** 1000+ electronic music radio stations, Intuitive XY-pad DJ effects, High pass/low pass filters, Tap tempo delay, Stutter/glitch effect, Digital oscillator banks for rise/drop sounds

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### VAPolyMk4

[App page](https://appshunter.io/ios/app/vapolymk4/id6753038075)

This app is a powerful bi-timbral polyphonic synthesizer with advanced features like output morphing and a ring modulator. It offers extensive sound design capabilities with multiple oscillators, filters, and envelopes, and can be used standalone or as an AudioUnit Extension.

**Highlights:** Bi-timbral polyphonic synthesis, Output morphing and ring modulator, Multiple oscillators, filters, and envelopes, Standalone and AudioUnit Extension (AUv3) support, Built-in effects and piano roll sequencer, MIDI 2.0 and Ableton Link support, iCloud Drive for project sharing

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Electro Siren free?

Electro Siren costs $2.99, with no in-app purchases.

### Is VAPolyMk4 free?

VAPolyMk4 costs $3.99, with no in-app purchases.

### Which has better reviews, Electro Siren or VAPolyMk4?

VAPolyMk4 is rated higher. Electro Siren averages 2.7 out of 5 from 18 ratings, while VAPolyMk4 averages 5.0 from 2 ratings.

### Do Electro Siren or VAPolyMk4 have ads?

Neither Electro Siren nor VAPolyMk4 shows ads.

### Which is updated more often, Electro Siren or VAPolyMk4?

Electro Siren ships an update every 5 months, and VAPolyMk4 every 2 months. Most recently, Electro Siren was updated on October 23, 2026 and VAPolyMk4 on October 26, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*