# Room Impulse Response vs Midi Poly Grid

The clearest difference is review sentiment: Midi Poly Grid at 100% against Room Impulse Response's 0%. Midi Poly Grid also leads on price ($3.99 vs $49.99) and in-app purchases (none vs 1). On ads, monetization model, device support and iOS requirement there is nothing between them.

Room Impulse Response costs $49.99 and Midi Poly Grid $3.99 up front. Room Impulse Response sells 1 one-off in-app purchase. Midi Poly Grid asks for nothing beyond the download.

Room Impulse Response ships an update every 5 months, Midi Poly Grid every 11 days. The most recent releases landed on September 16, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Room Impulse Response | Midi Poly Grid |
| --- | --- | --- |
| Price | $49.99 | **$3.99** |
| Rating | — | **[5.0 (8 ratings)](https://appshunter.io/ios/app/midi-poly-grid/id1633882803/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 11 days** |
| Monetization | Paid | Paid |
| Size | 55 MB | 24 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Andreas Mueller](https://appshunter.io/developer/1633882805) |

## What reviewers say

### Room Impulse Response

[App page](https://appshunter.io/ios/app/room-impulse-response/id805907763)

Analyze the acoustic properties of rooms and loudspeakers. Record impulses or swept sines to generate Impulse Responses (IRs) and visualize various acoustic metrics like RT60, EDT, and clarity. Perform spectral analysis with FFT for detailed sound decay visualization.

**Highlights:** Record impulse or swept sine, Generate Impulse Response (IR), View ETC with RT60 cursors, Analyze Schroeder curve (EDT, T10, T20, T30), Spectral analysis with FFT, 3D waterfall plot for sound decay

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reference Curves Option | $14.99 | one-time |


### 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 Room Impulse Response free?

Room Impulse Response costs $49.99, and also offers in-app purchases.

### Is Midi Poly Grid free?

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

### Do Room Impulse Response or Midi Poly Grid have ads?

Neither Room Impulse Response nor Midi Poly Grid shows ads.

### Which is updated more often, Room Impulse Response or Midi Poly Grid?

Room Impulse Response ships an update every 5 months, and Midi Poly Grid every 11 days. Most recently, Room Impulse Response was updated on September 16, 2026 and Midi Poly Grid on September 9, 2026.

---

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