# iOptigan vs GRFX

The clearest difference is in-app purchases: GRFX at none against iOptigan's 16. iOptigan's advantage is review sentiment (92% vs 78%) and ratings volume (114 vs 10). On rating, ads and device support there is nothing between them.

iOptigan costs $5.99 and GRFX $6.99 up front. iOptigan sells 16 one-off in-app purchases. GRFX asks for nothing beyond the download.

iOptigan holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: iOptigan has 114 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 92% of iOptigan's written reviews are positive against 78% of GRFX's.

## The numbers

| Metric | iOptigan | GRFX |
| --- | --- | --- |
| Price | **$5.99** | $6.99 |
| Rating | **[4.8 (114 ratings)](https://appshunter.io/ios/app/ioptigan/id1143470101/reviews)** | [4.6 (10 ratings)](https://appshunter.io/ios/app/grfx-granular-effects/id6745477065/reviews) |
| Number of ratings | **114** | 10 |
| Positive reviews | **92.2% of reviews** | 77.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#98** | — |
| Size | 179 MB | 117 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Stefan Stenzel](https://appshunter.io/developer/1143470100) | [Imaginando Lda](https://appshunter.io/developer/895445015) |

## What reviewers say

### iOptigan

[App page](https://appshunter.io/ios/app/ioptigan/id1143470101)

**Currently charting:** #98 Top Paid · Music (US App Store)

Experience the unique lo-fi sound of a vintage optical organ on your iOS device. This app faithfully recreates the original instrument's sound and functionality, allowing you to play chord patterns and explore different musical styles. It includes a virtual spring reverb, metronome, and MIDI capabilities for expanded creative control.

**Highlights:** Authentic lo-fi optical organ sound, Virtual spring reverb, Optical metronome, MIDI in/out and chord detection, Sequencer with record/playback, Audio and MIDI file sharing

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

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Champagne Music | $0.99 | one-time |
| Country Waltz | $0.99 | one-time |
| Romantic Strings | $0.99 | one-time |
| Big Top Marching Band | $0.99 | one-time |
| Polynesian Village | $0.99 | one-time |
| Singing Rhythm | $0.99 | one-time |
| Rollin’ Easy | $0.99 | one-time |
| Movin' | $0.99 | one-time |
| Cathedral Organ | $0.99 | one-time |
| Vox Humana | $0.99 | one-time |
| Country Sunshine | $0.99 | one-time |
| Down Home | $0.99 | one-time |
| Gospel Rock | $0.99 | one-time |
| Guitar Boogie | $0.99 | one-time |
| New Orleans Blues | $0.99 | one-time |
| Complete Disc Pak | $5.99 | one-time |

**What reviewers like**

- 🤩 Incredible sound quality
- 🎶 Unique musical instrument recreation
- ✨ Dream come true for musicians
- 🎹 Great for experimentalists
- 👍 Well-executed and fun

**What reviewers complain about**

- 🐛 Stuck/phantom keys
- 🐛 Audio clipping issues
- 🐛 Left-only headphone audio
- 🐛 Touch issues on bottom row
- 🐛 InterApp Audio broken in Garageband

**Reported bugs**

- Stuck/phantom keys on M1 iPad Pro
- E major plays D Diminished sample
- Bottom row of controls unresponsive
- Audio level clipping, especially when slowing playback
- Left-only headphone audio output

**Requested features**

- Update codebase with AudioKit Engine
- Allow app to run in background
- Add AudioUnit Extension support
- Include newly released sound packs
- Clarify chord identification methods


### GRFX

[App page](https://appshunter.io/ios/app/grfx-granular-effects/id6745477065)

Transform ordinary audio into extraordinary sonic landscapes with real-time granular effects. Slice and reshape sound into evolving textures, rhythmic glitches, and haunting drones using an intuitive pitch controller and extensive modulation options.

**Highlights:** Granular engine for textures and rhythms, Harmonic Triangle pitch control, Multi-effect chain with probabilistic routing, Four self-modulating LFOs, Drag-and-drop modulation system, Rhythmic synchronization

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iOptigan free?

iOptigan costs $5.99, and also offers in-app purchases.

### Is GRFX free?

GRFX costs $6.99, with no in-app purchases.

### Which has better reviews, iOptigan or GRFX?

iOptigan is rated higher. iOptigan averages 4.8 out of 5 from 114 ratings, while GRFX averages 4.6 from 10 ratings.

### Do iOptigan or GRFX have ads?

Neither iOptigan nor GRFX shows ads.

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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.*