# Seismometer ∞ vs Decibel Meter

The clearest difference is in-app purchases: Seismometer ∞ at none against Decibel Meter's 2. Decibel Meter's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Decibel Meter sells 2 in-app purchases, starting at $2.99 per month. Seismometer ∞ asks for nothing beyond the download.

## The numbers

| Metric | Seismometer ∞ | Decibel Meter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | — |
| Size | 16 MB | 14 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [辰巳家有限公司](https://appshunter.io/developer/1781943256) | [Duc Nguyen Ba Trung](https://appshunter.io/developer/6784288050) |

## What reviewers say

### Seismometer ∞

[App page](https://appshunter.io/ios/app/seismometer/id6761700650)

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

**In-app purchases:** none


### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-noise-db/id6788392364)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Decibel Meter Premium | $2.99 | per month |
| Decibel Meter Premium | $19.99 | one-time |


## Frequently asked questions

### Is Seismometer ∞ free?

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

### Is Decibel Meter free?

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

### Do Seismometer ∞ or Decibel Meter have ads?

Seismometer ∞ shows ads; Decibel Meter does not.

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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.*