# Decibel Meter Plus Pro vs Open Pi

The clearest difference is review sentiment: Open Pi at 100% against Decibel Meter Plus Pro's 53%. Open Pi also leads on price (Free vs $2.99) and rating (4.4 vs 3.7). Decibel Meter Plus Pro's advantage is ratings volume (81 vs 9) and iOS requirement (15.0 vs 18.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

Open Pi is free to download; Decibel Meter Plus Pro costs $2.99 up front. Decibel Meter Plus Pro sells 1 one-off in-app purchase and Open Pi sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Open Pi holds the better App Store score, 4.4 against 3.7. That said, the two scores are not equally well evidenced: Decibel Meter Plus Pro has 81 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 53% of Decibel Meter Plus Pro's written reviews are positive against 100% of Open Pi's.

Decibel Meter Plus Pro ships an update every 2 months, Open Pi weekly. The most recent releases landed on October 18, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Decibel Meter Plus Pro | Open Pi |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.7 (81 ratings)](https://appshunter.io/ios/app/decibel-meter-plus-pro/id645214476/reviews) | **[4.4 (9 ratings)](https://appshunter.io/ios/app/open-pi-raspberry-pi-manager/id6762019524/reviews)** |
| Number of ratings | **81** | 9 |
| Positive reviews | 52.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 12 MB | 43 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [华芳 张](https://appshunter.io/developer/586041482) | [Artem Svitelskyi](https://appshunter.io/developer/1892488801) |

## What reviewers say

### Decibel Meter Plus Pro

[App page](https://appshunter.io/ios/app/decibel-meter-plus-pro/id645214476)

Measure the sound levels around you with this utility app. It displays average, peak, and max values, offers decibel exposure time guidelines, and provides information on noise-induced hearing loss. The app also allows data recording and export for analysis.

**Highlights:** Measure sound levels, Display average, peak, and max values, Decibel exposure time guidelines, Information on noise-induced hearing loss, Record and export data, Calibrate measurements, Universal app support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Reports | $4.99 | one-time |


### Open Pi

[App page](https://appshunter.io/ios/app/open-pi-raspberry-pi-manager/id6762019524)

Manage your Raspberry Pi devices remotely without cloud services. Monitor system health, control Docker, run commands, transfer files, and manage GPIO from a modern, privacy-focused interface.

**Highlights:** Real-time system monitoring, SSH terminal access, Docker container management, GPIO control, File manager, Wake-on-LAN Helper, Remote system actions

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Single (Lifetime) | $5.99 | one-time |
| Family (Lifetime) | $12.99 | one-time |


## Frequently asked questions

### Is Decibel Meter Plus Pro free?

Decibel Meter Plus Pro costs $2.99, and also offers in-app purchases.

### Is Open Pi free?

Open Pi is free to download, with in-app purchases available.

### Which has better reviews, Decibel Meter Plus Pro or Open Pi?

Open Pi is rated higher. Decibel Meter Plus Pro averages 3.7 out of 5 from 81 ratings, while Open Pi averages 4.4 from 9 ratings.

### Do Decibel Meter Plus Pro or Open Pi have ads?

Neither Decibel Meter Plus Pro nor Open Pi shows ads.

### Which is updated more often, Decibel Meter Plus Pro or Open Pi?

Decibel Meter Plus Pro ships an update every 2 months, and Open Pi weekly. Most recently, Decibel Meter Plus Pro was updated on October 18, 2026 and Open Pi on October 11, 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.*