# Isaw⁺ vs Decibel Meter

The clearest difference is in-app purchases: Isaw⁺ at none against Decibel Meter's 4. Isaw⁺ also leads on ads (none vs shown) and iOS requirement (12.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Decibel Meter sells 4 in-app purchases, starting at $4.99 per month. Isaw⁺ asks for nothing beyond the download.

Isaw⁺ ships an update every 6 weeks, Decibel Meter every 4 weeks. The most recent releases landed on June 1, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Isaw⁺ | Decibel Meter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 4 weeks** |
| Size | 72 MB | 14 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Royalyze Healthcare Tech (Shenzhen) Co. Ltd.](https://appshunter.io/developer/1449821004) | [Nico Schroeder](https://appshunter.io/developer/432790036) |

## What reviewers say

### Isaw⁺

[App page](https://appshunter.io/ios/app/isaw/id6557068285)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-noise-analyzer/id6747433637)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Premium | $4.99 | per month |
| One Week Premium | $5.99 | per 7 days |
| One Year Premium | $19.99 | per year |
| Lifetime Premium | $29.99 | one-time |


## Frequently asked questions

### Is Isaw⁺ free?

Isaw⁺ 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 Isaw⁺ or Decibel Meter have ads?

Decibel Meter shows ads; Isaw⁺ does not.

### Which is updated more often, Isaw⁺ or Decibel Meter?

Isaw⁺ ships an update every 6 weeks, and Decibel Meter every 4 weeks. Most recently, Isaw⁺ was updated on June 1, 2026 and Decibel Meter on September 21, 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.*