# Decibel X PRO vs SmartAlign

The clearest difference is price: SmartAlign at Free against Decibel X PRO's $69.99. SmartAlign also leads on iOS requirement (13 vs 17.0). Decibel X PRO's advantage is device support. On in-app purchases there is nothing between them.

SmartAlign is free to download; Decibel X PRO costs $69.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Decibel X PRO | SmartAlign |
| --- | --- | --- |
| Price | $69.99 | **Free** |
| Rating | **[4.7 (6.9K ratings)](https://appshunter.io/ios/app/decibel-x-pro-dba-noise-meter/id1257651611/reviews)** | — |
| Number of ratings | **6.9K** | — |
| Positive reviews | 74.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 3 months | — |
| Monetization | Paid | — |
| Size | 24 MB | 4 MB |
| Requires iOS | 17.0 | **13** |
| Devices | **iPhone, iPad, Apple Watch** | — |
| Age rating | 4+ | 4+ |
| Developer | [SkyPaw Co., Limited](https://appshunter.io/developer/1842040687) | [Delta Electronics, Inc.](https://appshunter.io/developer/386896582) |

## What reviewers say

### Decibel X PRO

[App page](https://appshunter.io/ios/app/decibel-x-pro-dba-noise-meter/id1257651611)

This application transforms your device into a professional sound level meter, offering precise dBA and dBC measurements. It features advanced analysis tools like frequency spectrum analysis and data export, making it ideal for audio professionals and anyone interested in sound environments.

**Highlights:** Professional sound level meter, dBA and dBC measurements, Frequency spectrum analysis (FFT, BAR graphs), Data logging and export (PNG, CSV), Apple Watch support, Health App integration, Dosimeter with NIOSH, OSHA standards

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 👍 Works well
- 🚀 Keeps getting better with updates
- 💡 Useful for monitoring noise levels
- 💡 Helps protect hearing
- 👍 Accurate measurements

**What reviewers complain about**

- 🐛 Data transfer issues between devices
- 🐛 Crashes and stability issues
- 🐛 Camera crashes
- 🐛 Bugs with dark mode and language settings
- 🐛 Inconsistent readings compared to other apps

**Reported bugs**

- Crashes on launch after recent update
- Inability to open app on iPhone 6S and newer devices
- Incorrect or unreadable data display on iPad

**Requested features**

- Add video recording with live dB overlay
- Improve readability of frequency scale
- Include dBC measurements
- Add alarm for exceeding noise thresholds
- Provide more detailed documentation and support


### SmartAlign

[App page](https://appshunter.io/ios/app/smartalign/id6452600165)

**In-app purchases:** none


## Frequently asked questions

### Is Decibel X PRO free?

Decibel X PRO costs $69.99, with no in-app purchases.

### Is SmartAlign free?

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

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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.*