# Agonizer vs VOSIS Pro

The clearest difference is price: VOSIS Pro at $7.99 against Agonizer's $19.99. VOSIS Pro also leads on in-app purchases (none vs 3) and update cadence (every 3 months vs every 5 months). Agonizer's advantage is ratings volume (203 vs 7) and rating (4.8 vs 4.6). On ads and device support there is nothing between them.

Agonizer costs $19.99 and VOSIS Pro $7.99 up front. Agonizer sells 3 one-off in-app purchases. VOSIS Pro asks for nothing beyond the download.

Agonizer holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Agonizer has 203 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 78% of Agonizer's written reviews are positive against 67% of VOSIS Pro's.

Agonizer ships an update every 5 months, VOSIS Pro every 3 months. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Agonizer | VOSIS Pro |
| --- | --- | --- |
| Price | $19.99 | **$7.99** |
| Rating | **[4.8 (203 ratings)](https://appshunter.io/ios/app/agonizer/id1499426175/reviews)** | [4.6 (7 ratings)](https://appshunter.io/ios/app/vosis-pro/id1588226508/reviews) |
| Number of ratings | **203** | 7 |
| Positive reviews | **77.8% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 362 MB | 12 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Life Orange LLC](https://appshunter.io/developer/783342054) |

## What reviewers say

### Agonizer

[App page](https://appshunter.io/ios/app/agonizer/id1499426175)

This app is a monophonic synthesizer focused on bass sounds, developed with a synth bass expert. It features dual wavetable oscillators, a mangle section, and built-in stereo effects. It supports MPE controllers and various audio/MIDI connectivity options for standalone or app-to-app use.

**Highlights:** Monophonic synth engine for bass, Dual wavetable oscillators, Built-in stereo effects, MPE controller support, Standalone and AUv3 operation, 140+ factory presets

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chrome Oasis Pack | $3.99 | one-time |
| Circuit Bender Pack | $3.99 | one-time |
| Neon Nightmare Pack | $4.99 | one-time |

**What reviewers like**

- 🎵 Excellent sound quality and unique bass tones
- 🎨 Intuitive and well-designed user interface
- ⚙️ Powerful modulation and sound design capabilities
- 🎛️ Wobulator feature for creative bass manipulation
- 📦 Great presets included with the app

**What reviewers complain about**

- 🐛 Keyboard legato/mono-synth behavior inconsistent
- 🐛 Frequent crashes in host applications (AUM, Cubasis, Audiobus)
- 🐛 No sound output in GarageBand and some AU hosts
- 🐛 App freezes on splash screen with iOS 18.3
- 🐛 UI responsiveness issues and knob lag

**Reported bugs**

- Keyboard does not properly handle legato/mono-synth note priority
- Crashes in Audiobus, AUM, and Cubasis host applications
- No sound output when used as AUv3 plugin in hosts
- No sound in GarageBand integration
- App freezes on splash screen with iOS 18.3

**Requested features**

- Polyphony mode or toggle between mono and poly
- Envelope drawing capability instead of preset selection
- Menu-based waveform selection instead of cycling
- Arpeggiator function
- Preset browser search and favorites filter


### VOSIS Pro

[App page](https://appshunter.io/ios/app/vosis-pro/id1588226508)

Transform images into unique sounds and compose visual music. This tool offers advanced filters and MIDI control for experimental sound design and creative audio manipulation.

**Highlights:** Image to sound conversion, Advanced image filters, MIDI keyboard support, Customizable presets, Unlimited recording, Video file loading (iPad/Desktop)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Agonizer free?

Agonizer costs $19.99, and also offers in-app purchases.

### Is VOSIS Pro free?

VOSIS Pro costs $7.99, with no in-app purchases.

### Which has better reviews, Agonizer or VOSIS Pro?

Agonizer is rated higher. Agonizer averages 4.8 out of 5 from 203 ratings, while VOSIS Pro averages 4.6 from 7 ratings.

### Do Agonizer or VOSIS Pro have ads?

Neither Agonizer nor VOSIS Pro shows ads.

### Which is updated more often, Agonizer or VOSIS Pro?

Agonizer ships an update every 5 months, and VOSIS Pro every 3 months. Most recently, Agonizer was updated on October 14, 2026 and VOSIS Pro on October 9, 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.*