# Decibel dB vs Fast Mobile QR Code Scanner

The clearest difference is monetization model: Fast Mobile QR Code Scanner at free with in-app purchases against Decibel dB's subscription. Fast Mobile QR Code Scanner also leads on update cadence (daily vs every 4 months). Decibel dB's advantage is ratings volume (685 vs 37) and review sentiment (77% vs 67%). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Decibel dB sells 6 in-app purchases, starting at $3.99 per 7 days and Fast Mobile QR Code Scanner sells 1 in-app purchase, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Decibel dB against 4.6 for Fast Mobile QR Code Scanner. That said, the two scores are not equally well evidenced: Decibel dB has 685 ratings behind it against 37, so its average is the more settled of the two. Written reviews are what separate them: 77% of Decibel dB's written reviews are positive against 67% of Fast Mobile QR Code Scanner's.

Decibel dB ships an update every 4 months, Fast Mobile QR Code Scanner daily. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Decibel dB | Fast Mobile QR Code Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (685 ratings)](https://appshunter.io/ios/app/decibel-db-sound-level-meter/id1644852399/reviews)** | [4.6 (37 ratings)](https://appshunter.io/ios/app/fast-mobile-qr-code-scanner/id6736392452/reviews) |
| Number of ratings | **685** | 37 |
| Positive reviews | **77.4% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 32 MB | 8 MB |
| Requires iOS | **12.4** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ITincubator UAB](https://appshunter.io/developer/1617775851) | [Ronald Starkel](https://appshunter.io/developer/1771820736) |

## What reviewers say

### Decibel dB

[App page](https://appshunter.io/ios/app/decibel-db-sound-level-meter/id1644852399)

Measure ambient noise and sound levels in real-time with this tool. It helps control noise pollution and protect user health by displaying decibel values numerically and graphically. Track exposure over time with NIOSH and OSHA compliant measurements.

**Highlights:** Measure noise in decibels (dB), Track MIN, AVG, MAX sound levels, Record and export measurements, Overlay noise levels on photos/videos, NIOSH and OSHA compliant meter

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sound Level Meter Pro | $3.99 | per 7 days |
| Weekly Access | $3.99 | per 7 days |
| Decibel Meter: Pro Version | $6.99 | per month |
| Monthly Access | $6.99 | per month |
| Noise Level Meter (dB) Pro | $12.99 | per year |
| Yearly Access | $12.99 | per year |

**What reviewers like**

- 👍 Accurate and reliable measurements
- 🚀 Easy to use interface
- 💡 Innovative features like photo/video noise overlay
- 👍 Compliant with industry standards
- 👍 Detailed noise tracking and monitoring

**What reviewers complain about**

- 🐛 Inconsistent accuracy compared to other apps
- 🐛 Doesn't detect loud noises accurately

**Reported bugs**

- Inaccurate decibel readings in some environments
- Occasional crashes or freezes

**Requested features**

- Ability to record and export noise measurements
- Integration with smart home devices


### Fast Mobile QR Code Scanner

[App page](https://appshunter.io/ios/app/fast-mobile-qr-code-scanner/id6736392452)

Scan and create QR codes and barcodes for various purposes, including websites, contacts, and event tickets. Features include fast performance, a user-friendly interface, and a history log to track your scans. Unlock full functionality with an auto-renewable subscription.

**Highlights:** Scan QR codes and barcodes, Generate custom QR codes and barcodes, History management, Fast performance, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3-day trial then 6.99$/week | $6.99 | per 7 days |


## Frequently asked questions

### Is Decibel dB free?

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

### Is Fast Mobile QR Code Scanner free?

Fast Mobile QR Code Scanner is free to download, with in-app purchases available.

### Which has better reviews, Decibel dB or Fast Mobile QR Code Scanner?

Decibel dB is rated higher. Decibel dB averages 4.7 out of 5 from 685 ratings, while Fast Mobile QR Code Scanner averages 4.6 from 37 ratings.

### Do Decibel dB or Fast Mobile QR Code Scanner have ads?

Neither Decibel dB nor Fast Mobile QR Code Scanner shows ads.

### Which is updated more often, Decibel dB or Fast Mobile QR Code Scanner?

Decibel dB ships an update every 4 months, and Fast Mobile QR Code Scanner daily. Most recently, Decibel dB was updated on October 22, 2026 and Fast Mobile QR Code Scanner on October 24, 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.*