# OpeNoise vs Biodiversa

The clearest difference is update cadence: Biodiversa at every 10 days against OpeNoise's every 7 months. OpeNoise's advantage is review sentiment (86% vs 67%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OpeNoise ships an update every 7 months, Biodiversa every 10 days. The most recent releases landed on September 21, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | OpeNoise | Biodiversa |
| --- | --- | --- |
| 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** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 10 days** |
| Monetization | Free | Free |
| Size | 18 MB | 145 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arpa Piemonte](https://appshunter.io/developer/1317255035) | [3Bee](https://appshunter.io/developer/1533079868) |

## 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


### Biodiversa

[App page](https://appshunter.io/ios/app/biodiversa-snap-and-protect/id6480924470)

Identify plants and contribute to biodiversity monitoring by snapping photos. Engage in challenges, learn about species, and join a community dedicated to ecosystem conservation. This app turns outdoor exploration into an educational and protective adventure.

**Highlights:** Photo-based plant recognition, Contribute to scientific database, Learn about species and biodiversity, Participate in community challenges, Explore and expand nature experience, Support biodiversity research

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

**In-app purchases:** none


## Frequently asked questions

### Is OpeNoise free?

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

### Is Biodiversa free?

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

### Do OpeNoise or Biodiversa have ads?

Neither OpeNoise nor Biodiversa shows ads.

### Which is updated more often, OpeNoise or Biodiversa?

OpeNoise ships an update every 7 months, and Biodiversa every 10 days. Most recently, OpeNoise was updated on September 21, 2026 and Biodiversa on September 9, 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.*