# VAPolyPro vs STEM

The clearest difference is price: VAPolyPro at $4.99 against STEM's $14.99. VAPolyPro also leads on update cadence (every 2 days vs monthly) and iOS requirement (16.6 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

VAPolyPro costs $4.99 and STEM $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

VAPolyPro ships an update every 2 days, STEM monthly. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | VAPolyPro | STEM |
| --- | --- | --- |
| Price | **$4.99** | $14.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/vapolypro/id6801931805/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | Paid | — |
| Size | 22 MB | 283 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Togawa](https://appshunter.io/developer/1474193056) | [Michael Ivertowski](https://appshunter.io/developer/6774757588) |

## What reviewers say

### VAPolyPro

[App page](https://appshunter.io/ios/app/vapolypro/id6801931805)

Create a wide range of sounds with this polyphonic synthesizer, featuring multiple oscillator and filter types, MPE support, and built-in effects. It functions as a standalone app or an AudioUnit Extension for Mac and iOS devices, with iCloud Drive integration for project sharing.

**Highlights:** Multiple VCO and VCF types, Stereo VCF and VCA, MPE support, Built-in effects, Step sequencer, Audio Unit Extension (AUv3), iCloud Drive project sharing

**Features:** Vision Pro support

**In-app purchases:** none


### STEM

[App page](https://appshunter.io/ios/app/stem-live-stem-separation/id6808668529)

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

**In-app purchases:** none


## Frequently asked questions

### Is VAPolyPro free?

VAPolyPro costs $4.99, with no in-app purchases.

### Is STEM free?

STEM costs $14.99, with no in-app purchases.

### Do VAPolyPro or STEM have ads?

Neither VAPolyPro nor STEM shows ads.

### Which is updated more often, VAPolyPro or STEM?

VAPolyPro ships an update every 2 days, and STEM monthly. Most recently, VAPolyPro was updated on October 31, 2026 and STEM on October 29, 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.*