# Decibel Meter Plus Pro vs Authenticator App

The clearest difference is price: Authenticator App at Free against Decibel Meter Plus Pro's $0.99. Authenticator App also leads on rating (5.0 vs 3.8) and update cadence (every 2 weeks vs every 2 months). Decibel Meter Plus Pro's advantage is ratings volume (80 vs 2) and iOS requirement (15.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

Authenticator App is free to download; Decibel Meter Plus Pro costs $0.99 up front. Decibel Meter Plus Pro sells 1 one-off in-app purchase and Authenticator App sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Authenticator App holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Decibel Meter Plus Pro has 80 ratings behind it against 2, so its average is the more settled of the two.

Decibel Meter Plus Pro ships an update every 2 months, Authenticator App every 2 weeks. The most recent releases landed on September 21, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Decibel Meter Plus Pro | Authenticator App |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.8 (80 ratings)](https://appshunter.io/ios/app/decibel-meter-plus-pro/id645214476/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/authenticator-app-keyzy/id6748629429/reviews)** |
| Number of ratings | **80** | 2 |
| Positive reviews | 52.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 12 MB | 7 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [华芳 张](https://appshunter.io/developer/586041482) | [RETRYTECH LLP](https://appshunter.io/developer/1544420363) |

## 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 | $2.99 | one-time |


### Authenticator App

[App page](https://appshunter.io/ios/app/authenticator-app-keyzy/id6748629429)

This app generates secure, offline two-factor authentication codes for all your major online accounts. It offers iCloud sync for Apple devices and allows for easy organization and deletion of codes. Upgrade for unlimited accounts and advanced categorization.

**Highlights:** Supports major platforms (Google, Instagram, Facebook, GitHub), Import 2FA codes from screenshots, iCloud Sync across Apple devices, Organize codes into categories, Private and offline code storage, Generates TOTP codes securely

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Yearly | $12.99 | per year |
| Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Decibel Meter Plus Pro free?

Decibel Meter Plus Pro costs $0.99, and also offers in-app purchases.

### Is Authenticator App free?

Authenticator App is free to download, with in-app purchases available.

### Which has better reviews, Decibel Meter Plus Pro or Authenticator App?

Authenticator App is rated higher. Decibel Meter Plus Pro averages 3.8 out of 5 from 80 ratings, while Authenticator App averages 5.0 from 2 ratings.

### Do Decibel Meter Plus Pro or Authenticator App have ads?

Neither Decibel Meter Plus Pro nor Authenticator App shows ads.

### Which is updated more often, Decibel Meter Plus Pro or Authenticator App?

Decibel Meter Plus Pro ships an update every 2 months, and Authenticator App every 2 weeks. Most recently, Decibel Meter Plus Pro was updated on September 21, 2026 and Authenticator App on September 23, 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.*