JAX Convolutor PRO (AU) vs SL Echo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JAX Convolutor PRO (AU)
This app uses complex signal processing to create realistic reverberation effects by analyzing real-world environments. It allows users to apply these effects to audio material, making it sound as if it were played in a specific location. Advanced adjustments can refine the results for professional audio production.
- Realistic reverberation effects
- Impulse response analysis
- Audio material manipulation
- FFT algorithm processing
- Customizable adjustments
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Remarks: This is an Audio Unit, but you have to open the distribution app ones at least to install the included IR file library. Convolution is a highly complex signal processing approach, that needs some certain computation power. The recorded impulse response of a real world environment is used to render a reverberation effect onto any audio material, so that it sounds like the source was played in that original room or at that location. Some further adjustments and manipulations can be applied to refine these results. Now this all may sound somewhat naive at first listen but the entire calculation is extremely complex math, so that the very first processors and computers were able to perform this in realtime rather around the end of the last millennium. Basically, the impulse responses and the audio stream are completely analyzed with FFT algorithms and then the entire analysis data will be cross-modulated into the realtime audio stream by performing a repeated highly performance intensive re-synthesis and accumulation processing for each analysis block of the impulse response. Therefore it is a crucial performance factor that you use JAX Convolutor with larger processing buffer sizes (1024) samples. Shorter buffers may raise the CPU hit exorbitantly for several reasons. The manual is embedded into the main app.
SL Echo
This audio effect app provides animated delay and space for musical decisions on iPad. Easily adjust time, feedback, and tone for various repeat styles, while maintaining a clear dry signal with stereo width and ducking. It supports AUv3 integration with popular music hosts.
- Animated delay and space effects
- Adjustable time and feedback
- Tone shaping controls
- Stereo width and ducking
- AUv3 support
- Standalone preview mode
- Factory and user presets
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SL Echo is a focused AUv3 delay effect designed for fast musical decisions on iPad. Move from a close vocal pocket to wide, evolving repeats without navigating complex pages. • Time and feedback for slapback or long trails • Tone shaping for darker or brighter repeats • Stereo width and ducking for a clear dry signal • Factory presets and local user presets • AUv3 support for compatible iPad music hosts Works as a standalone preview app and as an AUv3 effect in GarageBand, AUM, Cubasis, BeatMaker 3 and other compatible hosts.
Screenshots
Verdict
The clearest difference is update cadence: SL Echo at weekly against JAX Convolutor PRO (AU)'s every 25 months. SL Echo also leads on rating (5.0 vs 4.6) and price ($6.99 vs $9.99). JAX Convolutor PRO (AU)'s advantage is ratings volume (5 vs 1) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases, monetization model 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
JAX Convolutor PRO (AU) costs $9.99 and SL Echo $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SL Echo holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: JAX Convolutor PRO (AU) has 5 ratings behind it against 1, so its average is the more settled of the two.
JAX Convolutor PRO (AU) ships an update every 25 months, SL Echo weekly. The most recent releases landed on October 29, 2026 and October 16, 2026 respectively.
| Parameter | JAX Convolutor PRO (AU) | SL Echo |
|---|---|---|
| Price | $9.99 | $6.99 — better |
| Rating | 4.6 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 25 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 139 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Guell | VIACHESLAV ZHILTSOV |
Customer experience
JAX Convolutor PRO (AU)
SL Echo
In-app purchases
JAX Convolutor PRO (AU)
No in-app purchases
SL Echo
No in-app purchases









