# GridInstrument vs Midi Poly Grid

The clearest difference is rating: Midi Poly Grid at 5.0 against GridInstrument's 4.5. Midi Poly Grid also leads on review sentiment (100% vs 83%). GridInstrument's advantage is iOS requirement (8.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

GridInstrument costs $3.99 and Midi Poly Grid $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Midi Poly Grid holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 11 and 8 respectively. Written reviews point the same way: 83% of GridInstrument's written reviews are positive against 100% of Midi Poly Grid's.

GridInstrument ships an update weekly, Midi Poly Grid every 11 days. The most recent releases landed on September 11, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | GridInstrument | Midi Poly Grid |
| --- | --- | --- |
| Price | $3.99 | $3.99 |
| Rating | [4.5 (11 ratings)](https://appshunter.io/ios/app/gridinstrument/id1296511558/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/midi-poly-grid/id1633882803/reviews)** |
| Number of ratings | **11** | 8 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | Paid | Paid |
| Size | 15 MB | 24 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Decidedly, LLC](https://appshunter.io/developer/783782943) | [Andreas Mueller](https://appshunter.io/developer/1633882805) |

## What reviewers say

### GridInstrument

[App page](https://appshunter.io/ios/app/gridinstrument/id1296511558)

This app transforms your iOS device into a unique musical instrument with a grid-based interface. Explore over 20 musical modes and various grid layouts. It also supports external MIDI controllers like the Launchpad for expanded creative possibilities.

**Highlights:** Grid-based note arrangement, Launchpad integration, Over 20 musical modes, Multiple grid layouts, Core MIDI out, Audiobus 3 MIDI support

**Features:** Vision Pro support

**In-app purchases:** none


### Midi Poly Grid

[App page](https://appshunter.io/ios/app/midi-poly-grid/id1633882803)

This app functions solely as a MIDI controller, requiring a host application or DAW to produce sound. It offers intuitive pad controls for melodies and finger drumming, with advanced modulation options like MPE and polyphonic aftertouch. Connect virtually or via USB/Bluetooth to other devices and DAWs.

**Highlights:** Size-adjustable grid of pads, MPE and polyphonic aftertouch modulation, Custom grid creation, Virtual MIDI connection, Preset saving, Multiple layouts and colors

**In-app purchases:** none


## Frequently asked questions

### Is GridInstrument free?

GridInstrument costs $3.99, with no in-app purchases.

### Is Midi Poly Grid free?

Midi Poly Grid costs $3.99, with no in-app purchases.

### Which has better reviews, GridInstrument or Midi Poly Grid?

Midi Poly Grid is rated higher. GridInstrument averages 4.5 out of 5 from 11 ratings, while Midi Poly Grid averages 5.0 from 8 ratings.

### Do GridInstrument or Midi Poly Grid have ads?

Neither GridInstrument nor Midi Poly Grid shows ads.

### Which is updated more often, GridInstrument or Midi Poly Grid?

GridInstrument ships an update weekly, and Midi Poly Grid every 11 days. Most recently, GridInstrument was updated on September 11, 2026 and Midi Poly Grid on September 27, 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.*