# 421Grid vs MIDI FX PRO

The clearest difference is price: 421Grid at $1.99 against MIDI FX PRO's $9.99. MIDI FX PRO's advantage is update cadence (monthly vs every 3 months) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

421Grid costs $1.99 and MIDI FX PRO $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

421Grid ships an update every 3 months, MIDI FX PRO monthly. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 421Grid | MIDI FX PRO |
| --- | --- | --- |
| Price | **$1.99** | $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 | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | — | Paid |
| Size | 4 MB | 263 MB |
| Requires iOS | 18.0 | **14.7** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [N. Wheeler](https://appshunter.io/developer/312350021) | [Jorge Arroyo](https://appshunter.io/developer/548989572) |

## What reviewers say

### 421Grid

[App page](https://appshunter.io/ios/app/421grid/id1598461370)

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

**In-app purchases:** none


### 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 421Grid free?

421Grid costs $1.99, with no in-app purchases.

### Is MIDI FX PRO free?

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

### Do 421Grid or MIDI FX PRO have ads?

Neither 421Grid nor MIDI FX PRO shows ads.

### Which is updated more often, 421Grid or MIDI FX PRO?

421Grid ships an update every 3 months, and MIDI FX PRO monthly. Most recently, 421Grid was updated on October 30, 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.*