# 波動 Hysteric Oscillator vs PolyIvoks Filter

The clearest difference is review sentiment: PolyIvoks Filter at 86% against 波動 Hysteric Oscillator's 0%. PolyIvoks Filter also leads on rating (4.7 vs 4.0) and ratings volume (21 vs 7). On price, update cadence, ads and in-app purchases there is nothing between them.

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

PolyIvoks Filter holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 7 and 21 respectively. Written reviews point the same way: 0% of 波動 Hysteric Oscillator's written reviews are positive against 86% of PolyIvoks Filter's.

波動 Hysteric Oscillator ships an update every 11 days, PolyIvoks Filter fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | 波動 Hysteric Oscillator | PolyIvoks Filter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (7 ratings)](https://appshunter.io/ios/app/hysteric-oscillator/id1473229854/reviews) | **[4.7 (21 ratings)](https://appshunter.io/ios/app/polyivoks-filter/id1507649629/reviews)** |
| Number of ratings | 7 | **21** |
| Positive reviews | 0.0% of reviews | **85.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 9 MB | 17 MB |
| Requires iOS | 15.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Toshihiko Arai](https://appshunter.io/developer/415194231) | [RRS, OOO](https://appshunter.io/developer/1486125568) |

## What reviewers say

### 波動 Hysteric Oscillator

[App page](https://appshunter.io/ios/app/hysteric-oscillator/id1473229854)

Generate test tones and observe real-time waveform changes. Explore frequency, volume, filters, and modulation effects for audio experiments and learning synthesizer basics.

**Highlights:** Generate test tones and drone sounds, Real-time waveform display, Control frequency, volume, and panning, Low-pass filter, AM/FM modulation effects, Two-channel mode (Full Version), Save and recall settings (Full Version)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $6.99 | one-time |


### 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 |


## Frequently asked questions

### Is 波動 Hysteric Oscillator free?

波動 Hysteric Oscillator is free to download, with in-app purchases available.

### Is PolyIvoks Filter free?

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

### Which has better reviews, 波動 Hysteric Oscillator or PolyIvoks Filter?

PolyIvoks Filter is rated higher. 波動 Hysteric Oscillator averages 4.0 out of 5 from 7 ratings, while PolyIvoks Filter averages 4.7 from 21 ratings.

### Do 波動 Hysteric Oscillator or PolyIvoks Filter have ads?

Neither 波動 Hysteric Oscillator nor PolyIvoks Filter shows ads.

### Which is updated more often, 波動 Hysteric Oscillator or PolyIvoks Filter?

波動 Hysteric Oscillator ships an update every 11 days, and PolyIvoks Filter fortnightly. Most recently, 波動 Hysteric Oscillator was updated on October 24, 2026 and PolyIvoks Filter on October 24, 2026.

---

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