# 2FA Authenticator (2FAS) vs Decibel Meter Sound Detector

The clearest difference is in-app purchases: 2FA Authenticator (2FAS) at none against Decibel Meter Sound Detector's 6. Decibel Meter Sound Detector's advantage is iOS requirement (14.0 vs 18.6). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Decibel Meter Sound Detector sells 6 one-off in-app purchases. 2FA Authenticator (2FAS) asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for 2FA Authenticator (2FAS) against 4.7 for Decibel Meter Sound Detector. Both are backed by a comparable volume of ratings — 36K and 56K respectively. Written reviews are what separate them: 77% of 2FA Authenticator (2FAS)'s written reviews are positive against 79% of Decibel Meter Sound Detector's.

2FA Authenticator (2FAS) ships an update monthly, Decibel Meter Sound Detector every 5 weeks. Both last shipped on October 26, 2026.

## The numbers

| Metric | 2FA Authenticator (2FAS) | Decibel Meter Sound Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (36K ratings)](https://appshunter.io/ios/app/2fa-authenticator-2fas/id1217793794/reviews)** | [4.7 (56K ratings)](https://appshunter.io/ios/app/decibel-meter-sound-detector/id1254994873/reviews) |
| Number of ratings | 36K | **56K** |
| Positive reviews | 77.3% of reviews | **78.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 81 MB | 20 MB |
| Requires iOS | 18.6 | **14.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Two Factor Authentication Service Inc.](https://appshunter.io/developer/1217793793) | [Ashraf Thoppukadavil](https://appshunter.io/developer/1254994872) |

## What reviewers say

### 2FA Authenticator (2FAS)

[App page](https://appshunter.io/ios/app/2fa-authenticator-2fas/id1217793794)

Securely log in to your online accounts with two-factor authentication. This app protects your personal data and passwords from cyber threats with a simple, private, and open-source solution. It offers easy token restoration, app protection, and offline functionality.

**Highlights:** Two-factor authentication, Token backup and restore, App protection with passcode/biometrics, Open-source and transparent, Offline functionality, Cross-device sync, One-tap authentication with browser extensions

**Features:** Apple Watch app

**In-app purchases:** none

**What reviewers like**

- 🚀 Efficient and fast
- 🔒 Secure and private
- 👍 Simple and intuitive UI
- 💡 Customizable icons and folders
- 🔒 iCloud backup and sync

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🔒 Lack of password/PIN protection
- 🕰 No Apple Watch app
- 🐛 Issues with push notifications
- 🕰 Missing desktop/web app

**Reported bugs**

- Tokens disappearing after device changes
- Push notification failures
- Incompatibility with older devices

**Requested features**

- Alphanumeric passcode option
- Custom icon uploads
- Apple Watch app
- Desktop/web app
- Improved support and communication


### Decibel Meter Sound Detector

[App page](https://appshunter.io/ios/app/decibel-meter-sound-detector/id1254994873)

Monitor your surroundings with this decibel meter app. It measures sound levels in real-time, providing clear visual analysis and advanced filtering options. Easily share your readings for documentation or further analysis.

**Highlights:** Real-time decibel (dB) readings, Frequency weighting (A, B, C, Z), Share measurements via various apps, 1/3 octave band frequency analysis, Display current, average, and max values, Advanced filter range settings

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Decibel Meter | $1.99 | one-time |
| Decibel Meter Premium | $4.99 | one-time |
| Decibel Meter | $4.99 | one-time |
| Decibel Meter | $9.99 | one-time |
| Decibel Meter | $19.99 | one-time |
| Decibel Meter | $29.99 | one-time |

**What reviewers like**

- 👍 No bloatware
- 👍 Quite useful
- 👍 Excellent and useful app
- 👍 Easy to use
- 👍 Simple, clear and accurate

**What reviewers complain about**

- 🐛 Ads block settings
- 🐛 Inaccurate readings
- 🐛 Not sensitive at all
- 🐛 Dangerously inaccurate
- 🐛 Unable to record continuously

**Reported bugs**

- Analyze feature is broken
- Analyze feature has backwards time axis
- Repeatedly prompts to paste from clipboard
- Freezes after a few seconds of use

**Requested features**

- Ability to name or add notes to recordings
- Option to specify microphone to use
- Ability to stop and start new recordings without closing app
- Landscape mode
- Calibration against professional equipment


## Frequently asked questions

### Is 2FA Authenticator (2FAS) free?

2FA Authenticator (2FAS) is free to download, with no in-app purchases.

### Is Decibel Meter Sound Detector free?

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

### Which has better reviews, 2FA Authenticator (2FAS) or Decibel Meter Sound Detector?

2FA Authenticator (2FAS) is rated higher. 2FA Authenticator (2FAS) averages 4.7 out of 5 from 36K ratings, while Decibel Meter Sound Detector averages 4.7 from 56K ratings.

### Do 2FA Authenticator (2FAS) or Decibel Meter Sound Detector have ads?

Neither 2FA Authenticator (2FAS) nor Decibel Meter Sound Detector shows ads.

### Which is updated more often, 2FA Authenticator (2FAS) or Decibel Meter Sound Detector?

2FA Authenticator (2FAS) ships an update monthly, and Decibel Meter Sound Detector every 5 weeks. Most recently, 2FA Authenticator (2FAS) was updated on October 26, 2026 and Decibel Meter Sound Detector on October 26, 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.*