# RetroSFX vs Seyfert

The clearest difference is update cadence: Seyfert at every 2 days against RetroSFX's every 5 weeks. Seyfert also leads on device support. RetroSFX's advantage is price ($0.99 vs $1.99). On in-app purchases and iOS requirement there is nothing between them.

RetroSFX costs $0.99 and Seyfert $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RetroSFX ships an update every 5 weeks, Seyfert every 2 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | RetroSFX | Seyfert |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/seyfert/id6794878287/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Monetization | — | Paid |
| Size | 133 MB | 3 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ali Taleb](https://appshunter.io/developer/1635037808) | [Konstantin Torsten Schutz](https://appshunter.io/developer/6778600016) |

## What reviewers say

### RetroSFX

[App page](https://appshunter.io/ios/app/retrosfx/id6761139769)

**In-app purchases:** none


### Seyfert

[App page](https://appshunter.io/ios/app/seyfert/id6794878287)

This music effect plugin creates unique echoes that orbit and revolve around the listener. It offers advanced control over pitch, depth, and tone for each echo, with a built-in reverb and EQ for a rich soundscape. It functions as a standalone app or an Audio Unit for music production software.

**Highlights:** Orbital echo generation, Spin and Doppler pitch-bend effects, 3D binaural imaging, Octave shimmer and transpose, Per-echo tone and drive, Echo-focused reverb and EQ, Standalone and AUv3 support

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

**In-app purchases:** none


## Frequently asked questions

### Is RetroSFX free?

RetroSFX costs $0.99, with no in-app purchases.

### Is Seyfert free?

Seyfert costs $1.99, with no in-app purchases.

### Which is updated more often, RetroSFX or Seyfert?

RetroSFX ships an update every 5 weeks, and Seyfert every 2 days. Most recently, RetroSFX was updated on October 25, 2026 and Seyfert 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.*