# OnBoardGUARD™ vs Decibel Meter

The clearest difference is in-app purchases: OnBoardGUARD™ at none against Decibel Meter's 3. OnBoardGUARD™ also leads on device support (3 vs 1) and iOS requirement (14.0.0 vs 16.0). Decibel Meter's advantage is update cadence (monthly vs every 2 months). On price and ads there is nothing between them.

Both are free to download. Decibel Meter sells 3 in-app purchases, starting at $2.99 per 7 days. OnBoardGUARD™ asks for nothing beyond the download.

OnBoardGUARD™ ships an update every 2 months, Decibel Meter monthly. The most recent releases landed on October 7, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | OnBoardGUARD™ | Decibel Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (54 ratings)](https://appshunter.io/ios/app/decibel-meter-db-noise-level/id6744018521/reviews)** |
| Number of ratings | — | **54** |
| Positive reviews | — | 70.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 37 MB | 176 MB |
| Requires iOS | **14.0.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [FIDELAK GmbH](https://appshunter.io/developer/1787178271) | [PaoApps](https://appshunter.io/developer/1746019535) |

## What reviewers say

### OnBoardGUARD™

[App page](https://appshunter.io/ios/app/onboardguard/id6739815003)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-db-noise-level/id6744018521)

This tool transforms your iPhone into a real-time sound level meter. It measures and displays environmental noise in decibels, helping you monitor sound at home, work, or outdoors. Protect your hearing by detecting loud noises and staying aware of your sound environment.

**Highlights:** Real-time decibel measurement, Dynamic graph display, Min/Max/Average sound levels, Measuring timer, Pause and Reset buttons, Noise pollution checks

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access with Trial | $2.99 | per 7 days |
| Weekly Access | $2.99 | per 7 days |
| Yearly Access | $17.99 | per year |


## Frequently asked questions

### Is OnBoardGUARD™ free?

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

### Is Decibel Meter free?

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

### Do OnBoardGUARD™ or Decibel Meter have ads?

Neither OnBoardGUARD™ nor Decibel Meter shows ads.

### Which is updated more often, OnBoardGUARD™ or Decibel Meter?

OnBoardGUARD™ ships an update every 2 months, and Decibel Meter monthly. Most recently, OnBoardGUARD™ was updated on October 7, 2026 and Decibel Meter on October 21, 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.*