Comparison

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.

Head to head
About

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.

Highlights
  • Realistic reverberation effects
  • Impulse response analysis
  • Audio material manipulation
  • FFT algorithm processing
  • Customizable adjustments
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

JAX Convolutor PRO (AU)4 screens
SL Echo3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
JAX Convolutor PRO (AU) versus SL Echo: the parameters behind the verdict, then further details
ParameterJAX Convolutor PRO (AU)SL Echo
Price$9.99$6.99 — better
Rating4.6 (5 ratings)5.0 (1 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings5 — better1
Update frequencyEvery 25 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size139 MB18 MB
Age rating4+4+
DeveloperJens GuellVIACHESLAV ZHILTSOV

Customer experience

JAX Convolutor PRO (AU)

All ratings5 ratings
Positive80.0%
Neutral20.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SL Echo

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

JAX Convolutor PRO (AU)

No in-app purchases

None

SL Echo

No in-app purchases

Questions

Is JAX Convolutor PRO (AU) free?
JAX Convolutor PRO (AU) costs $9.99, with no in-app purchases.
Is SL Echo free?
SL Echo costs $6.99, with no in-app purchases.
Which has better reviews, JAX Convolutor PRO (AU) or SL Echo?
SL Echo is rated higher. JAX Convolutor PRO (AU) averages 4.6 out of 5 from 5 ratings, while SL Echo averages 5.0 from 1 ratings.
Do JAX Convolutor PRO (AU) or SL Echo have ads?
Neither JAX Convolutor PRO (AU) nor SL Echo shows ads.
Which is updated more often, JAX Convolutor PRO (AU) or SL Echo?
JAX Convolutor PRO (AU) ships an update every 25 months, and SL Echo weekly. Most recently, JAX Convolutor PRO (AU) was updated on October 29, 2026 and SL Echo on October 16, 2026.

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