# StageBoost vs RDX

The clearest difference is price: StageBoost at Free against RDX's $2.99. StageBoost also leads on update cadence (every 2 days vs every 5 days) and iOS requirement (15.1 vs 17.0). RDX's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

StageBoost is free to download; RDX costs $2.99 up front. StageBoost sells 1 in-app purchase, starting at $1.99 per month. RDX asks for nothing beyond the download.

StageBoost ships an update every 2 days, RDX every 5 days. The most recent releases landed on October 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | StageBoost | RDX |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rdx-fm-manager-auv3/id6783084652/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 5 days |
| Monetization | — | Paid |
| Size | 147 MB | 1 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [STAGEBOOST SOLUCOES E SERVICOS LTDA](https://appshunter.io/developer/1803834711) | [Rubens Felicio](https://appshunter.io/developer/6775565794) |

## What reviewers say

### StageBoost

[App page](https://appshunter.io/ios/app/stageboost/id6743656961)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Seja Pro | $1.99 | per month |


### RDX

[App page](https://appshunter.io/ios/app/rdx-fm-manager-auv3/id6783084652)

This app acts as a librarian and player for classic 6-operator FM synthesizer patches (.syx files). It allows you to preview sounds, organize your collection, and export cartridges for hardware or software synths. It's designed for FM synthesis enthusiasts and DX7 owners.

**Highlights:** Real FM patch preview, Organize patch collections, Export .syx cartridges, Velocity-sensitive keyboard, Multiplatform support, AUv3 plugin included

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is StageBoost free?

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

### Is RDX free?

RDX costs $2.99, with no in-app purchases.

### Do StageBoost or RDX have ads?

StageBoost shows ads; RDX does not.

### Which is updated more often, StageBoost or RDX?

StageBoost ships an update every 2 days, and RDX every 5 days. Most recently, StageBoost was updated on October 1, 2026 and RDX 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.*