# OttOrgan vs SL Echo

The clearest difference is update cadence: SL Echo at weekly against OttOrgan's every 5 months. SL Echo also leads on price ($6.99 vs $9.00). OttOrgan's advantage is ratings volume (3 vs 1) and iOS requirement (12.5.6 vs 15.0). On rating, ads, in-app purchases and monetization model there is nothing between them.

OttOrgan costs $9.00 and SL Echo $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for OttOrgan against 5.0 for SL Echo. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

OttOrgan ships an update every 5 months, SL Echo weekly. Both last shipped on October 16, 2026.

## The numbers

| Metric | OttOrgan | SL Echo |
| --- | --- | --- |
| Price | $9.00 | **$6.99** |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/ottorgan/id519638462/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sl-echo/id6797348934/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 340 MB | 18 MB |
| Requires iOS | **12.5.6** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Markus Sigg](https://appshunter.io/developer/458880634) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### OttOrgan

[App page](https://appshunter.io/ios/app/ottorgan/id519638462)

This application allows users to play a specific house organ sample set using a MIDI keyboard and pedal on iOS or macOS devices. It provides access to a unique five-rank manual and attached pedal with a 16' subbass.

**Highlights:** Play Ott-Orgel sample set, Connect MIDI keyboard, Connect MIDI pedal, iOS and macOS support, House organ simulation

**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 OttOrgan free?

OttOrgan costs $9.00, with no in-app purchases.

### Is SL Echo free?

SL Echo costs $6.99, with no in-app purchases.

### Which has better reviews, OttOrgan or SL Echo?

OttOrgan and SL Echo are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do OttOrgan or SL Echo have ads?

Neither OttOrgan nor SL Echo shows ads.

### Which is updated more often, OttOrgan or SL Echo?

OttOrgan ships an update every 5 months, and SL Echo weekly. Most recently, OttOrgan was updated on October 16, 2026 and SL Echo on October 16, 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.*