caTTho vs MIDI FX PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
caTTho
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If you have any idea for good guitar or bass riff, note it using this app and export it to file or raw text.
MIDI FX PRO
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.
- MIDI signal processing
- Harmonize, Transpose, Arpeggiate
- Sequencer for synths
- Delay/looper
- Internal instruments (drums, piano, synth)
- Filter notes by velocity
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Buy once and get the iOS and Mac apps (with Family Sharing) This is the Unlocked Version of MIDI FX. You can buy this version instead of unlocking the free one through IAP Control your MIDI signals and process them in any combination of ways: Harmonize, Transpose, Arpeggiate, etc... Or use the Sequencer to play any external or virtual synth. Use a MIDI interface to unlock the power of the app to control multiple synths with one keyboard, play one note and generate chords, basslines, etc... Use the delay/looper or filter notes based on velocity or other parameters to send to different synths/effects. A MIDI workstation in your pocket (or your iPad/Mac) You can also use some internal instruments (drums sampler, piano or synth) if you are away from your MIDI gear, and sequence whole songs inside the app, or use other synth apps as input/output for MIDI FX. Your imagination is the limit!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | caTTho | MIDI FX PRO |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 7 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 26.0 | 14.7 — better |
| Further details — not scored | ||
| Size | 13 MB | 263 MB |
| Age rating | 4+ | 4+ |
| Developer | Vlastimil Stefl | Jorge Arroyo |
In-app purchases
caTTho
- Premium fatures$0.99
MIDI FX PRO
No in-app purchases
