# Rotary Mod vs SL Prism

The clearest difference is price: Rotary Mod at $7.99 against SL Prism's $19.99. Rotary Mod also leads on iOS requirement (11.0 vs 15.0). SL Prism's advantage is update cadence (every 10 days vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

Rotary Mod costs $7.99 and SL Prism $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rotary Mod ships an update every 3 months, SL Prism every 10 days. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Rotary Mod | SL Prism |
| --- | --- | --- |
| Price | **$7.99** | $19.99 |
| Rating | **[4.3 (23 ratings)](https://appshunter.io/ios/app/rotary-mod/id1463786028/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | Paid | — |
| Size | 24 MB | 18 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eventide](https://appshunter.io/developer/546518026) | [VIACHESLAV ZHILTSOV](https://appshunter.io/developer/1862005860) |

## What reviewers say

### Rotary Mod

[App page](https://appshunter.io/ios/app/rotary-mod/id1463786028)

This app emulates a Leslie speaker, creating a pulsing vibrato effect for instruments and vocals. It offers precise control over rotor and horn speeds, cabinet size, and includes advanced features like frequency modulation and a unique Ribbon control for simultaneous parameter adjustments.

**Highlights:** Independent rotor and horn speed control, Frequency modulation with secondary LFO, Selectable cabinet size (Standard/Giant), Hicut control for tone shaping, Tap Tempo for BPM sync, Innovative Ribbon control, Mix Lock for preset scrolling

**In-app purchases:** none


### SL Prism

[App page](https://appshunter.io/ios/app/sl-prism/id6806684924)

**In-app purchases:** none


## Frequently asked questions

### Is Rotary Mod free?

Rotary Mod costs $7.99, with no in-app purchases.

### Is SL Prism free?

SL Prism costs $19.99, with no in-app purchases.

### Do Rotary Mod or SL Prism have ads?

Neither Rotary Mod nor SL Prism shows ads.

### Which is updated more often, Rotary Mod or SL Prism?

Rotary Mod ships an update every 3 months, and SL Prism every 10 days. Most recently, Rotary Mod was updated on October 26, 2026 and SL Prism on October 29, 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.*