# VOSIS vs PdParty

The clearest difference is rating: PdParty at 5.0 against VOSIS's 4.2. PdParty also leads on update cadence (every 3 months vs every 8 months) and ratings volume (17 vs 5). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PdParty holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 17 respectively. Written reviews complicate that: 86% of VOSIS's written reviews are positive against 78% of PdParty's, so the app with the better star average is not the one people write more warmly about.

VOSIS ships an update every 8 months, PdParty every 3 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | VOSIS | PdParty |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/vosis/id783342051/reviews) | **[5.0 (17 ratings)](https://appshunter.io/ios/app/pdparty/id970528308/reviews)** |
| Number of ratings | 5 | **17** |
| Positive reviews | **85.7% of reviews** | 77.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 11 MB | 16 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Life Orange LLC](https://appshunter.io/developer/783342054) | [Daniel Wilcox](https://appshunter.io/developer/970528307) |

## What reviewers say

### VOSIS

[App page](https://appshunter.io/ios/app/vosis/id783342051)

This app transforms image data into sound, allowing for unique musical compositions and experimental sound design. It offers control over pitch, timbre, and envelopes to create shape-timbre relationships from visual input.

**Highlights:** Image sonification, Visual music composition, Experimental sound design, Pixel luminance audification, Shape-timbre relationships, Adjustable pitch and timbre, ADSR envelope control

**In-app purchases:** none


### PdParty

[App page](https://appshunter.io/ios/app/pdparty/id970528308)

This app allows users to run Pure Data patches on iOS devices, enabling custom digital signal processing. It supports OSC, MIDI, and game controller input, offering a WYSIWYG experience for creating multimedia applications.

**Highlights:** Run Pure Data patches on iOS, Supports OSC, MIDI, and game controller input, Native Pd GUI objects for WYSIWYG, Built-in web server for patch management, General purpose digital signal processing platform

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VOSIS free?

VOSIS is free to download, with no in-app purchases.

### Is PdParty free?

PdParty is free to download, with no in-app purchases.

### Which has better reviews, VOSIS or PdParty?

PdParty is rated higher. VOSIS averages 4.2 out of 5 from 5 ratings, while PdParty averages 5.0 from 17 ratings.

### Do VOSIS or PdParty have ads?

Neither VOSIS nor PdParty shows ads.

### Which is updated more often, VOSIS or PdParty?

VOSIS ships an update every 8 months, and PdParty every 3 months. Most recently, VOSIS was updated on November 1, 2026 and PdParty on November 1, 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.*