# OpeNoise vs EER Pro

The clearest difference is in-app purchases: OpeNoise at none against EER Pro's 1. OpeNoise also leads on iOS requirement (15.0 vs 26.0). EER Pro's advantage is update cadence (every 3 weeks vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. EER Pro sells 1 in-app purchase, starting at $1.99 per month. OpeNoise asks for nothing beyond the download.

OpeNoise ships an update every 7 months, EER Pro every 3 weeks. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | OpeNoise | EER Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/openoise/id1387499991/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 12 MB | 3 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Arpa Piemonte](https://appshunter.io/developer/1317255035) | [Andrea Cattane](https://appshunter.io/developer/452754384) |

## What reviewers say

### OpeNoise

[App page](https://appshunter.io/ios/app/openoise/id1387499991)

This application measures real-time sound pressure levels, displaying minimum and maximum values. It offers advanced analysis like third octave and FFT, with options to save data, calibrate, and share measurements with a community. Note: it is not intended for professional use.

**Highlights:** Real-time A-weighted sound pressure level measurement, Minimum and maximum level tracking, Third octave and FFT analysis, Data saving in text file, Calibration functionality, Measurements displayed on a map, Community sharing of calibration and measurements

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

**In-app purchases:** none


### EER Pro

[App page](https://appshunter.io/ios/app/eer-pro/id6787630404)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| abbonamento mensile | $1.99 | per month |


## Frequently asked questions

### Is OpeNoise free?

OpeNoise is free to download, with no in-app purchases.

### Is EER Pro free?

EER Pro is free to download, with in-app purchases available.

### Do OpeNoise or EER Pro have ads?

Neither OpeNoise nor EER Pro shows ads.

### Which is updated more often, OpeNoise or EER Pro?

OpeNoise ships an update every 7 months, and EER Pro every 3 weeks. Most recently, OpeNoise was updated on October 13, 2026 and EER Pro on October 8, 2026.

---

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