# Decibel Meter vs Cers IoT

The clearest difference is in-app purchases: Cers IoT at none against Decibel Meter's 1. Cers IoT also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Decibel Meter sells 1 one-off in-app purchase. Cers IoT asks for nothing beyond the download.

Decibel Meter ships an update every 5 weeks, Cers IoT every 2 months. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Decibel Meter | Cers IoT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 3 MB | 46 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [博 彭](https://appshunter.io/developer/1293268076) | [(주)온전히](https://appshunter.io/developer/1591164615) |

## What reviewers say

### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-noisescope/id6760281155)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro永久版 | $1.99 | one-time |


### Cers IoT

[App page](https://appshunter.io/ios/app/cers-iot/id6761812425)

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

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter free?

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

### Is Cers IoT free?

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

### Do Decibel Meter or Cers IoT have ads?

Neither Decibel Meter nor Cers IoT shows ads.

### Which is updated more often, Decibel Meter or Cers IoT?

Decibel Meter ships an update every 5 weeks, and Cers IoT every 2 months. Most recently, Decibel Meter was updated on October 8, 2026 and Cers IoT on October 6, 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.*