# Phosphor 3 vs Agonizer

The clearest difference is price: Phosphor 3 at $5.99 against Agonizer's $19.99. Phosphor 3 also leads on in-app purchases (none vs 3). Agonizer's advantage is ratings volume (203 vs 9) and update cadence (every 5 months vs every 11 months). On rating, review sentiment, ads and iOS requirement there is nothing between them.

Phosphor 3 costs $5.99 and Agonizer $19.99 up front. Agonizer sells 3 one-off in-app purchases. Phosphor 3 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Phosphor 3 against 4.8 for Agonizer. That said, the two scores are not equally well evidenced: Agonizer has 203 ratings behind it against 9, so its average is the more settled of the two. Written reviews split almost evenly too, at 79% and 79% positive.

Phosphor 3 ships an update every 11 months, Agonizer every 5 months. The most recent releases landed on July 6, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Phosphor 3 | Agonizer |
| --- | --- | --- |
| Price | **$5.99** | $19.99 |
| Rating | [4.7 (9 ratings)](https://appshunter.io/ios/app/phosphor-3/id1499115553/reviews) | **[4.8 (203 ratings)](https://appshunter.io/ios/app/agonizer/id1499426175/reviews)** |
| Number of ratings | 9 | **203** |
| Positive reviews | 78.6% of reviews | **78.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 27 MB | 362 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Audio Damage, Inc.](https://appshunter.io/developer/1248448317) | [Kai Aras](https://appshunter.io/developer/370820899) |

## What reviewers say

### Phosphor 3

[App page](https://appshunter.io/ios/app/phosphor-3/id1499115553)

This app recreates a vintage digital synthesizer, offering a faithful emulation of a classic sound engine. It includes modern features like MPE, extensive modulation, and a new UI for sonic exploration.

**Highlights:** Vintage digital synthesizer emulation, Additive synthesis engine, MPE support, Extensive modulation routing, Preset manager, Tuning tables

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Phosphor 3 free?

Phosphor 3 costs $5.99, with no in-app purchases.

### Is Agonizer free?

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

### Which has better reviews, Phosphor 3 or Agonizer?

Agonizer is rated higher. Phosphor 3 averages 4.7 out of 5 from 9 ratings, while Agonizer averages 4.8 from 203 ratings.

### Do Phosphor 3 or Agonizer have ads?

Neither Phosphor 3 nor Agonizer shows ads.

### Which is updated more often, Phosphor 3 or Agonizer?

Phosphor 3 ships an update every 11 months, and Agonizer every 5 months. Most recently, Phosphor 3 was updated on July 6, 2026 and Agonizer on September 22, 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.*