jAmp Convolve vs Evil Otto
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
jAmp Convolve
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.
- AI-powered impulse response generation
- Realistic guitar cabinet simulation
- Realistic bass cabinet simulation
- Reverb simulations
- Real-time sound shaping
- No external IR files required
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jAmp Convolve is a professional audio convolution plugin (AUv3) for iOS and macOS, using advanced neural network‑powered impulse response generation to deliver realistic guitar cabinet, bass cabinet, and reverb simulations — ideal for musicians, producers, and sound designers. Unlike traditional convolution plugins, it does not require loading external impulse response files. Instead, jAmp Convolve’s AI engine dynamically shapes the sound in real time, letting you explore and fine‑tune tones without the hassle of managing IR libraries.
Evil Otto
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.
- 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
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Evil Otto is a multiband OTT (Over-The-Top) compressor that applies simultaneous upward and downward compression across three frequency bands. The result is dense, hyper-detailed audio where peaks are controlled and quiet details are pushed forward — a sound heard across modern electronic music, pop, and hip-hop production. Features -- Three-Band OTT Compression Evil Otto splits your signal into low, mid, and high frequency bands and applies independent upward and downward compression to each. Quiet details come up, peaks come down, and each band can be tuned separately. -- Precise Control Without Complexity Fifteen parameters give you everything you need and nothing you don't: Depth, Time, independent Down and Up amounts, per-band thresholds, per-band output levels, and input/output gain. -- Sidechain Input Route an external signal to duck the compressed output for rhythmic pumping effects. A dedicated Listen mode lets you monitor the sidechain signal to verify routing. -- Real-Time Metering Nine meters show input levels, gain reduction, and output levels per band. The center meters display both downward compression and upward expansion relative to the threshold, so you can see exactly what the compressor is doing. -- Factory Presets Includes a library of starting points across a range of applications. Save and recall your own presets with the built-in preset browser. -- Cross-Platform Compatible User presets created on iOS work on macOS, Windows, and Linux. Sessions created in GarageBand or Logic on iOS will open the desktop version on macOS.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | jAmp Convolve | Evil Otto |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 5.0 (2 ratings) — better | 4.5 (4 ratings) |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 2 months | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Jan Maes | Audio Damage, Inc. |
Customer experience
jAmp Convolve
Evil Otto
In-app purchases
jAmp Convolve
- jAmp Convolve Activation$4.99
Evil Otto
No in-app purchases





