# HSLock vs Decibels Meter

The clearest difference is iOS requirement: HSLock at 9.0 against Decibels Meter's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HSLock ships an update fortnightly, Decibels Meter every 9 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | HSLock | Decibels Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/decibels-meter/id6755508693/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | — | Free |
| Size | 11 MB | 27 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [庆省 韩](https://appshunter.io/developer/1441108108) | [剑 罗](https://appshunter.io/developer/1854272181) |

## What reviewers say

### HSLock

[App page](https://appshunter.io/ios/app/hslock/id1441108109)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibels Meter

[App page](https://appshunter.io/ios/app/decibels-meter/id6755508693)

Monitor real-time decibel levels at concerts and festivals. Capture moments with watermarked photos and receive alerts for potentially harmful sound levels to protect your hearing.

**Highlights:** Real-time decibel monitoring, Watermark camera for concert photos, Hearing protection alerts, Sound pressure level measurement, Venue sound terminology

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HSLock free?

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

### Is Decibels Meter free?

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

### Do HSLock or Decibels Meter have ads?

Neither HSLock nor Decibels Meter shows ads.

### Which is updated more often, HSLock or Decibels Meter?

HSLock ships an update fortnightly, and Decibels Meter every 9 days. Most recently, HSLock was updated on October 26, 2026 and Decibels Meter on October 28, 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.*