# OpeNoise vs Decibel Reader

The clearest difference is rating: Decibel Reader at 4.5 against OpeNoise's 4.0. Decibel Reader also leads on update cadence (every 2 weeks vs every 7 months) and ratings volume (24 vs 4). OpeNoise's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price, review sentiment and device support there is nothing between them.

Both are free to download. Decibel Reader sells 6 in-app purchases, starting at $3.99 per 7 days. OpeNoise asks for nothing beyond the download.

Decibel Reader holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Decibel Reader has 24 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 86% of OpeNoise's written reviews are positive against 80% of Decibel Reader's, so the app with the better star average is not the one people write more warmly about.

OpeNoise ships an update every 7 months, Decibel Reader every 2 weeks. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | OpeNoise | Decibel Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/openoise/id1387499991/reviews) | **[4.5 (24 ratings)](https://appshunter.io/ios/app/decibel-reader/id6451411046/reviews)** |
| Number of ratings | 4 | **24** |
| Positive reviews | **85.7% of reviews** | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 18 MB | 12 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Arpa Piemonte](https://appshunter.io/developer/1317255035) | [Andy Sutanto](https://appshunter.io/developer/1659282966) |

## 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


### Decibel Reader

[App page](https://appshunter.io/ios/app/decibel-reader/id6451411046)

Measure ambient noise levels with real-time readings, tracking minimum, average, and maximum decibels. Offers calibration for accuracy and a dark mode for comfortable viewing. This tool helps you understand your sound environment.

**Highlights:** Real-time decibel measurement, Calibration for accuracy, Track min, average, and max noise levels, Dark mode for low-light use, Simple and intuitive interface

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Decibel Meter Pro - 1 Week | $3.99 | per 7 days |
| Decibel Meter Pro - 1 Month | $7.99 | per month |
| Sound Level Meter - 6 Months | $19.99 | per 6 months |
| Noise Level Meter - 1 Year | $29.99 | per year |
| Decibel Meter Pro - 1Y 2 | $29.99 | per year |
| dB Meter Pro | $49.99 | one-time |


## Frequently asked questions

### Is OpeNoise free?

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

### Is Decibel Reader free?

Decibel Reader is free to download, with in-app purchases available.

### Which has better reviews, OpeNoise or Decibel Reader?

Decibel Reader is rated higher. OpeNoise averages 4.0 out of 5 from 4 ratings, while Decibel Reader averages 4.5 from 24 ratings.

### Do OpeNoise or Decibel Reader have ads?

Decibel Reader shows ads; OpeNoise does not.

### Which is updated more often, OpeNoise or Decibel Reader?

OpeNoise ships an update every 7 months, and Decibel Reader every 2 weeks. Most recently, OpeNoise was updated on September 26, 2026 and Decibel Reader on September 18, 2026.

---

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