# Ισοκράτης IsoFAn vs 905 ROCK

The clearest difference is price: 905 ROCK at Free against Ισοκράτης IsoFAn's $70.00. Ισοκράτης IsoFAn's advantage is update cadence (every 3 months vs every 9 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

905 ROCK is free to download; Ισοκράτης IsoFAn costs $70.00 up front. Neither carries in-app purchases, so what you see is what you pay.

Ισοκράτης IsoFAn ships an update every 3 months, 905 ROCK every 9 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Ισοκράτης IsoFAn | 905 ROCK |
| --- | --- | --- |
| Price | $70.00 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/isofan/id6443764042/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Monetization | Paid | — |
| Size | 86 MB | 43 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [GEORGIOS FANARAS](https://appshunter.io/developer/1649119855) | [OnWeb Systems](https://appshunter.io/developer/482533963) |

## What reviewers say

### Ισοκράτης IsoFAn

[App page](https://appshunter.io/ios/app/isofan/id6443764042)

This app provides Byzantine isokrattima with a human-like voice, aiding in Byzantine chant training. It allows for tone adjustments per molecule and semitone, customizable button layouts, and colored buttons.

**Highlights:** Byzantine isokrattima with human voice, Chant training assistance, Adjustable tone per molecule, Adjustable tone per semitone, Customizable button layout, Color-coded buttons

**Features:** Vision Pro support

**In-app purchases:** none


### 905 ROCK

[App page](https://appshunter.io/ios/app/905-rock/id6740345506)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ισοκράτης IsoFAn free?

Ισοκράτης IsoFAn costs $70.00, with no in-app purchases.

### Is 905 ROCK free?

905 ROCK is free to download, with no in-app purchases.

### Do Ισοκράτης IsoFAn or 905 ROCK have ads?

Neither Ισοκράτης IsoFAn nor 905 ROCK shows ads.

### Which is updated more often, Ισοκράτης IsoFAn or 905 ROCK?

Ισοκράτης IsoFAn ships an update every 3 months, and 905 ROCK every 9 months. Most recently, Ισοκράτης IsoFAn was updated on November 3, 2026 and 905 ROCK on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*