# Sharp Air vs Decibel

The clearest difference is rating: Decibel at 3.0 against Sharp Air's 1.9. Decibel also leads on update cadence (monthly vs every 6 months). Sharp Air's advantage is in-app purchases (none vs 5) and ratings volume (23 vs 3). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Decibel sells 2 in-app purchases, starting at $9.99 per 7 days. Sharp Air asks for nothing beyond the download.

Decibel holds the better App Store score, 3.0 against 1.9. That said, the two scores are not equally well evidenced: Sharp Air has 23 ratings behind it against 3, so its average is the more settled of the two.

Sharp Air ships an update every 6 months, Decibel monthly. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sharp Air | Decibel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.9 (23 ratings)](https://appshunter.io/ios/app/sharp-air/id1489138410/reviews) | **[3.0 (3 ratings)](https://appshunter.io/ios/app/decibel-db-sound-meter/id6755168199/reviews)** |
| Number of ratings | **23** | 3 |
| Positive reviews | 9.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 62 MB | 194 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Sharp Corporation](https://appshunter.io/developer/454644836) | [芳 王](https://appshunter.io/developer/1674464173) |

## What reviewers say

### Sharp Air

[App page](https://appshunter.io/ios/app/sharp-air/id1489138410)

Control your Wi-Fi enabled Sharp air purifier and air conditioner remotely. Monitor air quality, track energy consumption, and manage schedules from your mobile device. Receive alerts for filter replacement and optimize performance with smart features.

**Highlights:** Remote power ON/OFF, Set weekly schedules, Monitor air quality in real-time, Track electric consumption, Filter life alerts, Auto Presence ON/OFF, Sharp Cloud optimization

**In-app purchases:** none


### Decibel

[App page](https://appshunter.io/ios/app/decibel-db-sound-meter/id6755168199)

This app provides precise sound level measurements and audio analysis using professional weighting filters and real-time FFT spectrum analysis. It functions as a dosimeter for workplace safety and allows for easy sharing of dB data overlays on photos.

**Highlights:** Professional Frequency Weighting (ITU-R 468, A/B/C/Z), Real-Time FFT Spectrum Analysis, NIOSH & OSHA Standard Dosimeter, High-Precision Calibration, InstaDecibel Image Overlay, Live Activities Support, History Management & Export (PDF/M4A)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly VIP | $9.99 | per 7 days |
| Weekly VIP | $9.99 | per 7 days |


## Frequently asked questions

### Is Sharp Air free?

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

### Is Decibel free?

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

### Which has better reviews, Sharp Air or Decibel?

Decibel is rated higher. Sharp Air averages 1.9 out of 5 from 23 ratings, while Decibel averages 3.0 from 3 ratings.

### Do Sharp Air or Decibel have ads?

Neither Sharp Air nor Decibel shows ads.

### Which is updated more often, Sharp Air or Decibel?

Sharp Air ships an update every 6 months, and Decibel monthly. Most recently, Sharp Air was updated on October 24, 2026 and Decibel on October 31, 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.*