# jAmp Convolve vs Evil Otto

The clearest difference is price: jAmp Convolve at Free against Evil Otto's $4.99. jAmp Convolve also leads on rating (5.0 vs 4.5). Evil Otto's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 14.0). On ratings volume, ads and device support there is nothing between them.

jAmp Convolve is free to download; Evil Otto costs $4.99 up front. jAmp Convolve sells 1 one-off in-app purchase. Evil Otto asks for nothing beyond the download.

jAmp Convolve holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

## The numbers

| Metric | jAmp Convolve | Evil Otto |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/jamp-convolve/id6758905873/reviews)** | [4.5 (4 ratings)](https://appshunter.io/ios/app/evil-otto/id6760843522/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 38 MB | 60 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jan Maes](https://appshunter.io/developer/1550506252) | [Audio Damage, Inc.](https://appshunter.io/developer/1248448317) |

## What reviewers say

### jAmp Convolve

[App page](https://appshunter.io/ios/app/jamp-convolve/id6758905873)

This professional audio plugin uses AI to generate realistic guitar and bass cabinet simulations, as well as reverb effects. It bypasses the need for external impulse response files, allowing for real-time sound shaping and tone exploration.

**Highlights:** AI-powered impulse response generation, Realistic guitar cabinet simulation, Realistic bass cabinet simulation, Reverb simulations, Real-time sound shaping, No external IR files required

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| jAmp Convolve Activation | $4.99 | one-time |


### Evil Otto

[App page](https://appshunter.io/ios/app/evil-otto/id6760843522)

This audio effect applies simultaneous upward and downward compression across three frequency bands for detailed sound. It offers precise control over audio dynamics and includes features like sidechain input and real-time metering.

**Highlights:** Three-band OTT compression, Precise control parameters, Sidechain input for rhythmic effects, Real-time metering per band, Factory and user presets, Cross-platform preset compatibility

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is jAmp Convolve free?

jAmp Convolve is free to download, with in-app purchases available.

### Is Evil Otto free?

Evil Otto costs $4.99, with no in-app purchases.

### Which has better reviews, jAmp Convolve or Evil Otto?

jAmp Convolve is rated higher. jAmp Convolve averages 5.0 out of 5 from 2 ratings, while Evil Otto averages 4.5 from 4 ratings.

### Do jAmp Convolve or Evil Otto have ads?

Neither jAmp Convolve nor Evil Otto shows ads.

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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.*