Comparison

VOSIS vs PdParty

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

VOSIS

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
Read full description

VOSIS is a synthesizer combining audification of greyscale pixel data with several image filters. It is a tool for image sonification, visual music composition, and experimental sound design. The audification of pixel luminance values creates shape-timbre relationships. Pixel scan rate is controlled in terms of note interval, octave, and scale to give varying pitch between image regions. The ADSR envelope allows one to play images as a non-linear sequence of pitches with varying wavetable/timbre. For more features including presets and unlimited recording see VOSIS Pro. Visit vosis.app for sound example, demo videos, and user guide!

About

PdParty

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
Read full description

PdParty is an open-source iOS application for running Pure Data patches on Apple mobile devices using libpd. Directly inspired by Chris McCormick's PdDroidParty and the original RjDj by Reality Jockey, PdParty takes a step further by supporting OSC (Open Sound Control), MIDI, & MiFi game controller input as well as implementing the native Pd GUI objects for a WYSIWYG patch to mobile device experience. Various scene types are supported including compatibility modes for PdDroidParty & RjDj and both patches and abstraction libraries can be managed via a built-in web server. Unlike the rise of the single-purpose audio application, PdParty is meant to provide a platform for general purpose digital signal processing via Pure Data patches. Getting Started --------------- New users, check out the User Guide and download the PdParty Composer Pack which contains the abstractions you need when composing on your computer as well as scene type templates. See the PdParty webpage: http://danomatika.com/code/pdparty Who Is This App For? -------------------- PdParty is meant as a platform for running patches created in Pure Data, a graphical programming environment for multimedia. Related to Max MSP, Pure Data allows computer musicians and non-programmers to create custom DSP routines by connecting objects with virtual patch cables. If you don't intend to create your own PdParty scenes or run scenes provided by others, you may not find this app very useful. Please _do not_ download this app and give it a bad rating because you are unsure of what it's for or how to use it. How Can I Support PdParty? -------------------------- In the spirit of the open-source Pure Data community, PdParty is provided for free on the Apple App Store. If you wish to support its author and or PdParty development, consider having your institution sponsor a PdParty workshop, specific development, or a robotcowboy artist residency. Updating -------- See the changelog on the PdParty website for detailed version info. To update the included PdParty patch folders (lib, samples, tests) after installing a new version, use the buttons at the bottom of the Settings page.

Screenshots

VOSIS2 screens
PdParty4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard4 real differences · 6 level
VOSIS versus PdParty: the parameters behind the verdict, then further details
ParameterVOSISPdParty
PriceFreeFree
Rating4.2 (5 ratings)5.0 (17 ratings) — better
Positive reviews85.7% of reviews — better77.8% of reviews
Number of ratings517 — better
Update frequencyEvery 8 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.011.0 — better
Further details — not scored
Size11 MB16 MB
Age rating4+4+
DeveloperLife Orange LLCDaniel Wilcox

Customer experience

VOSIS

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews14 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

PdParty

All ratings16 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive77.8%
Neutral0.0%
Negative22.2%

In-app purchases

None

VOSIS

No in-app purchases

None

PdParty

No in-app purchases

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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