# JAX Unisonic (Audio Unit) vs SL Echo

The clearest difference is rating: SL Echo at 5.0 against JAX Unisonic (Audio Unit)'s 3.9. SL Echo also leads on price ($6.99 vs $9.99). JAX Unisonic (Audio Unit)'s advantage is ratings volume (9 vs 1) and iOS requirement (12.0 vs 15.0). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

JAX Unisonic (Audio Unit) 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 3.9. That said, the two scores are not equally well evidenced: JAX Unisonic (Audio Unit) has 9 ratings behind it against 1, so its average is the more settled of the two.

JAX Unisonic (Audio Unit) ships an update every 5 days, SL Echo weekly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | JAX Unisonic (Audio Unit) | SL Echo |
| --- | --- | --- |
| Price | $9.99 | **$6.99** |
| Rating | [3.9 (9 ratings)](https://appshunter.io/ios/app/jax-unisonic-audio-unit/id1492522141/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sl-echo/id6797348934/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | Paid | Paid |
| Size | 40 MB | 18 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jens Guell](https://appshunter.io/developer/1195004865) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### JAX Unisonic (Audio Unit)

[App page](https://appshunter.io/ios/app/jax-unisonic-audio-unit/id1492522141)

This audio unit generates up to 8 additional voices from any audio input by multiplying and shifting pitch. It simulates analog synthesizer unison effects for fattening sounds and adding presence, with individual voice transposition capabilities.

**Highlights:** Generates up to 8 additional voices, Multiplies and shifts audio input pitch, Simulates analog synthesizer unison effects, Individual voice transposition (+/- 1 octave), Time domain pitch shifting (low latency), Panorama spread for voices

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

**In-app purchases:** none


### SL Echo

[App page](https://appshunter.io/ios/app/sl-echo/id6797348934)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is JAX Unisonic (Audio Unit) free?

JAX Unisonic (Audio Unit) 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 Unisonic (Audio Unit) or SL Echo?

SL Echo is rated higher. JAX Unisonic (Audio Unit) averages 3.9 out of 5 from 9 ratings, while SL Echo averages 5.0 from 1 ratings.

### Do JAX Unisonic (Audio Unit) or SL Echo have ads?

Neither JAX Unisonic (Audio Unit) nor SL Echo shows ads.

### Which is updated more often, JAX Unisonic (Audio Unit) or SL Echo?

JAX Unisonic (Audio Unit) ships an update every 5 days, and SL Echo weekly. Most recently, JAX Unisonic (Audio Unit) was updated on November 3, 2026 and SL Echo on October 31, 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.*