# sumFX vs DJPrep

The clearest difference is price: DJPrep at Free against sumFX's $9.99. DJPrep also leads on update cadence (weekly vs every 6 months). sumFX's advantage is in-app purchases (none vs 3) and device support (3 vs 1). On ads there is nothing between them.

DJPrep is free to download; sumFX costs $9.99 up front. DJPrep sells 3 in-app purchases, starting at $1.99 per month. sumFX asks for nothing beyond the download.

sumFX ships an update every 6 months, DJPrep weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | sumFX | DJPrep |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.4 (12 ratings)](https://appshunter.io/ios/app/sumfx/id6450494474/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 54.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Paid | — |
| Size | 44 MB | 2 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [OSC Audio](https://appshunter.io/developer/1693533681) | [Pavlo Ivanenko](https://appshunter.io/developer/1896742881) |

## What reviewers say

### sumFX

[App page](https://appshunter.io/ios/app/sumfx/id6450494474)

This app is a versatile audio effects processor for musicians. It offers a modular design with multiple high-quality FX modules and customizable slots, allowing for quick creation of unique sounds. Focus on your music with intuitive controls and visual feedback.

**Highlights:** Modular multi-FX processor, 8 high-quality FX modules, 8 FX slots with Wet/Dry control, 2 LFOs per slot, 50+ cross-platform presets, Pre/post waveform view

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

**In-app purchases:** none


### DJPrep

[App page](https://appshunter.io/ios/app/djprep/id6770437337)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DJ Lite | $1.99 | per month |
| DJ Pro | $3.99 | per month |
| DJ Pro · Yearly | $24.99 | per year |


## Frequently asked questions

### Is sumFX free?

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

### Is DJPrep free?

DJPrep is free to download, with in-app purchases available.

### Do sumFX or DJPrep have ads?

Neither sumFX nor DJPrep shows ads.

### Which is updated more often, sumFX or DJPrep?

sumFX ships an update every 6 months, and DJPrep weekly. Most recently, sumFX was updated on October 24, 2026 and DJPrep on October 25, 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.*