# Room Impulse Response vs OB

The clearest difference is review sentiment: OB at 75% against Room Impulse Response's 0%. OB also leads on price ($19.99 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 OB $19.99 up front. Room Impulse Response sells 1 one-off in-app purchase. OB asks for nothing beyond the download.

Room Impulse Response ships an update every 5 months, OB every 10 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Room Impulse Response | OB |
| --- | --- | --- |
| Price | $49.99 | **$19.99** |
| Rating | — | **[4.1 (15 ratings)](https://appshunter.io/ios/app/ob-xd-3-auv3-synth/id6654915211/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | 0.0% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 10 days** |
| Monetization | Paid | Paid |
| Size | 56 MB | 210 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) | [DiscoDSP LLC](https://appshunter.io/developer/1465262828) |

## 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 |


### OB

[App page](https://appshunter.io/ios/app/ob-xd-3-auv3-synth/id6654915211)

This app recreates a classic vintage synthesizer, offering rich, full-bodied tones for electronic music, recordings, and film scores. It features MPE support, an on-screen MIDI keyboard, and high-quality rendering for enhanced music production.

**Highlights:** Oberheim OB-X emulation, MPE support, On-screen MIDI keyboard, High-quality retina rendering, AUv3 improvements, Preset search with categories

**Features:** macOS Compatibility

**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 OB free?

OB costs $19.99, with no in-app purchases.

### Do Room Impulse Response or OB have ads?

Neither Room Impulse Response nor OB shows ads.

### Which is updated more often, Room Impulse Response or OB?

Room Impulse Response ships an update every 5 months, and OB every 10 days. Most recently, Room Impulse Response was updated on November 1, 2026 and OB on October 30, 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.*