# ERS_EchORek2 vs KP Viewer

The clearest difference is price: ERS_EchORek2 at $9.99 against KP Viewer's $19.99. ERS_EchORek2 also leads on iOS requirement (9.3 vs 15.0). KP Viewer's advantage is rating (5.0 vs 4.1) and update cadence (every 4 days vs every 26 months). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

ERS_EchORek2 costs $9.99 and KP Viewer $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KP Viewer holds the better App Store score, 5.0 against 4.1. Both are backed by a comparable volume of ratings — 7 and 3 respectively.

ERS_EchORek2 ships an update every 26 months, KP Viewer every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | ERS_EchORek2 | KP Viewer |
| --- | --- | --- |
| Price | **$9.99** | $19.99 |
| Rating | [4.1 (7 ratings)](https://appshunter.io/ios/app/ers-echorek2/id1584374254/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/kp-viewer/id6807597087/reviews)** |
| Number of ratings | **7** | 3 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 4 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#193** |
| Size | 13 MB | 3 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christian Siedschlag](https://appshunter.io/developer/538434682) | [DEREK BERNARD](https://appshunter.io/developer/6807597090) |

## What reviewers say

### ERS_EchORek2

[App page](https://appshunter.io/ios/app/ers-echorek2/id1584374254)

This audio plugin emulates the iconic Binson Echorec2 analog delay, offering a unique, dreamlike, and psychedelic sound. Developed with careful study of original schematics, it provides enhanced controls for musicians seeking a distinctive vintage delay effect.

**Highlights:** Authentic 70's analog delay emulation, Binson Echorec2 sound, Enhanced controls, Psychedelic sound quality, Vintage delay effect

**Features:** Vision Pro support

**In-app purchases:** none


### KP Viewer

[App page](https://appshunter.io/ios/app/kp-viewer/id6807597087)

**Currently charting:** #193 Top Paid · Music (US App Store)

This app provides a clear, at-a-glance display for Kemper Profiler Player users during live performances. It shows current bank, rig name, effect status, morph status, and an automatic tuner, turning older devices into a dedicated stage display.

**Highlights:** Live performance display, Bank and Rig information, Rig name display, Effect status indicators, Automatic tuner, Dedicated stage display

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

**In-app purchases:** none


## Frequently asked questions

### Is ERS_EchORek2 free?

ERS_EchORek2 costs $9.99, with no in-app purchases.

### Is KP Viewer free?

KP Viewer costs $19.99, with no in-app purchases.

### Which has better reviews, ERS_EchORek2 or KP Viewer?

KP Viewer is rated higher. ERS_EchORek2 averages 4.1 out of 5 from 7 ratings, while KP Viewer averages 5.0 from 3 ratings.

### Do ERS_EchORek2 or KP Viewer have ads?

Neither ERS_EchORek2 nor KP Viewer shows ads.

### Which is updated more often, ERS_EchORek2 or KP Viewer?

ERS_EchORek2 ships an update every 26 months, and KP Viewer every 4 days. Most recently, ERS_EchORek2 was updated on October 24, 2026 and KP Viewer on October 24, 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.*