# caTTho vs MIDI FX PRO

The clearest difference is price: caTTho at Free against MIDI FX PRO's $9.99. MIDI FX PRO's advantage is in-app purchases (none vs 1) and update cadence (monthly vs every 7 months). On ads there is nothing between them.

caTTho is free to download; MIDI FX PRO costs $9.99 up front. caTTho sells 1 one-off in-app purchase. MIDI FX PRO asks for nothing beyond the download.

caTTho ships an update every 7 months, MIDI FX PRO monthly. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | caTTho | MIDI FX PRO |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/midi-fx-pro/id6444039855/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Monetization | — | Paid |
| Size | 13 MB | 263 MB |
| Requires iOS | 26.0 | **14.7** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Vlastimil Stefl](https://appshunter.io/developer/1447495739) | [Jorge Arroyo](https://appshunter.io/developer/548989572) |

## What reviewers say

### caTTho

[App page](https://appshunter.io/ios/app/cattho/id1559044904)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium fatures | $0.99 | one-time |


### MIDI FX PRO

[App page](https://appshunter.io/ios/app/midi-fx-pro/id6444039855)

This app is a powerful MIDI workstation for iOS and Mac, allowing users to control and process MIDI signals. It offers features like harmonization, transposition, arpeggiation, and sequencing for external or virtual synths. It also includes internal instruments and effects for mobile music creation.

**Highlights:** MIDI signal processing, Harmonize, Transpose, Arpeggiate, Sequencer for synths, Delay/looper, Internal instruments (drums, piano, synth), Filter notes by velocity

**In-app purchases:** none


## Frequently asked questions

### Is caTTho free?

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

### Is MIDI FX PRO free?

MIDI FX PRO costs $9.99, with no in-app purchases.

### Do caTTho or MIDI FX PRO have ads?

Neither caTTho nor MIDI FX PRO shows ads.

### Which is updated more often, caTTho or MIDI FX PRO?

caTTho ships an update every 7 months, and MIDI FX PRO monthly. Most recently, caTTho was updated on October 7, 2026 and MIDI FX PRO 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.*