# ShimmerVerb vs Agonizer

The clearest difference is in-app purchases: ShimmerVerb at none against Agonizer's 3. ShimmerVerb also leads on price ($14.99 vs $19.99) and update cadence (every 6 weeks vs every 5 months). Agonizer's advantage is ratings volume (203 vs 12) and rating (4.8 vs 4.6). On review sentiment, ads, device support and iOS requirement there is nothing between them.

ShimmerVerb costs $14.99 and Agonizer $19.99 up front. Agonizer sells 3 one-off in-app purchases. ShimmerVerb 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 12, so its average is the more settled of the two. Written reviews split almost evenly too, at 78% and 79% positive.

ShimmerVerb ships an update every 6 weeks, Agonizer every 5 months. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | ShimmerVerb | Agonizer |
| --- | --- | --- |
| Price | **$14.99** | $19.99 |
| Rating | [4.6 (12 ratings)](https://appshunter.io/ios/app/shimmerverb/id1463786346/reviews) | **[4.8 (203 ratings)](https://appshunter.io/ios/app/agonizer/id1499426175/reviews)** |
| Number of ratings | 12 | **203** |
| Positive reviews | 77.8% of reviews | **78.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 5 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 14 MB | 362 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eventide](https://appshunter.io/developer/546518026) | [Kai Aras](https://appshunter.io/developer/370820899) |

## What reviewers say

### ShimmerVerb

[App page](https://appshunter.io/ios/app/shimmerverb/id1463786346)

This app creates massive, lustrous reverbs with parallel pitch shifters for ethereal, shimmering soundscapes. It offers advanced feedback control and performance-oriented features like a "Ribbon" macro and "HotSwitch" for dynamic sound shaping.

**Highlights:** Massive lustrous reverb with parallel pitch shifters, Infinitely feedbackable signal for cascading reverbs, Adjustable feedback frequencies via cross-over network, Playable "Ribbon" performance macro, Instant parameter switching with "HotSwitch", "Freeze" button for smeared textures, AUv3 plugin and standalone app

**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 ShimmerVerb free?

ShimmerVerb costs $14.99, with no in-app purchases.

### Is Agonizer free?

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

### Which has better reviews, ShimmerVerb or Agonizer?

Agonizer is rated higher. ShimmerVerb averages 4.6 out of 5 from 12 ratings, while Agonizer averages 4.8 from 203 ratings.

### Do ShimmerVerb or Agonizer have ads?

Neither ShimmerVerb nor Agonizer shows ads.

### Which is updated more often, ShimmerVerb or Agonizer?

ShimmerVerb ships an update every 6 weeks, and Agonizer every 5 months. Most recently, ShimmerVerb was updated on September 21, 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.*