# PolyIvoks Filter vs MIDI FX

The clearest difference is monetization model: MIDI FX at free against PolyIvoks Filter's free with in-app purchases. MIDI FX also leads on rating (5.0 vs 4.7). PolyIvoks Filter's advantage is ratings volume (21 vs 4) and iOS requirement (10.0 vs 14.7). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. PolyIvoks Filter sells 1 one-off in-app purchase and MIDI FX sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

MIDI FX holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: PolyIvoks Filter has 21 ratings behind it against 4, so its average is the more settled of the two.

PolyIvoks Filter ships an update fortnightly, MIDI FX every 9 days. The most recent releases landed on September 13, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | PolyIvoks Filter | MIDI FX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (21 ratings)](https://appshunter.io/ios/app/polyivoks-filter/id1507649629/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/midi-fx/id1641511918/reviews)** |
| Number of ratings | **21** | 4 |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 263 MB |
| Requires iOS | **10.0** | 14.7 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [RRS, OOO](https://appshunter.io/developer/1486125568) | [Jorge Arroyo](https://appshunter.io/developer/548989572) |

## What reviewers say

### PolyIvoks Filter

[App page](https://appshunter.io/ios/app/polyivoks-filter/id1507649629)

This audio effect plugin emulates the sound of a legendary 1980s Soviet synthesizer filter. It offers stereo output and a range of modulation and envelope controls for creative sound shaping. A demo version is available with limited free play time.

**Highlights:** Standalone and AUv3 plugin, Modeled vintage filter, LFO and envelope modulation, Stereo output, Scalable GUI, Undo/Redo and A/B comparison

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RRS PolyIvoks Filter Unlimited | $4.99 | one-time |


### MIDI FX

[App page](https://appshunter.io/ios/app/midi-fx/id1641511918)

This app allows you to control and process MIDI signals for music creation. It offers features like harmonization, transposition, and sequencing, enabling you to control external or virtual synthesizers and create complex musical arrangements.

**Highlights:** MIDI signal processing, Harmonize and Transpose, Sequencer for synths, Delay and Looper, Filter notes by velocity, Internal instruments

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock app | $9.99 | one-time |


## Frequently asked questions

### Is PolyIvoks Filter free?

PolyIvoks Filter is free to download, with in-app purchases available.

### Is MIDI FX free?

MIDI FX is free to download, with in-app purchases available.

### Which has better reviews, PolyIvoks Filter or MIDI FX?

MIDI FX is rated higher. PolyIvoks Filter averages 4.7 out of 5 from 21 ratings, while MIDI FX averages 5.0 from 4 ratings.

### Do PolyIvoks Filter or MIDI FX have ads?

Neither PolyIvoks Filter nor MIDI FX shows ads.

### Which is updated more often, PolyIvoks Filter or MIDI FX?

PolyIvoks Filter ships an update fortnightly, and MIDI FX every 9 days. Most recently, PolyIvoks Filter was updated on September 13, 2026 and MIDI FX on June 4, 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.*