# Decibel Meter vs iSecretWorld

The clearest difference is price: iSecretWorld at Free against Decibel Meter's $0.99. iSecretWorld also leads on update cadence (daily vs every 3 months) and iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

iSecretWorld is free to download; Decibel Meter costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Decibel Meter ships an update every 3 months, iSecretWorld daily. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Decibel Meter | iSecretWorld |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/decibel-meter-sound-test/id6764498347/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | Paid | — |
| Size | 41 MB | 24 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [恒盛 程](https://appshunter.io/developer/1533201832) | [建华 姚](https://appshunter.io/developer/1788245287) |

## What reviewers say

### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-sound-test/id6764498347)

Measure ambient sound levels in real-time using your device's microphone. Understand your environment's noise status, save measurement sessions, and generate PDF reports with data and scene photos. Useful for everyday reference and record-keeping.

**Highlights:** Real-time decibel readings, Spectrum analysis, Environment status labels, Session statistics, Measurement history, Audio playback, Scene photo records, PDF reports

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

**In-app purchases:** none


### iSecretWorld

[App page](https://appshunter.io/ios/app/isecretworld/id6768144048)

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

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter free?

Decibel Meter costs $0.99, with no in-app purchases.

### Is iSecretWorld free?

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

### Do Decibel Meter or iSecretWorld have ads?

Neither Decibel Meter nor iSecretWorld shows ads.

### Which is updated more often, Decibel Meter or iSecretWorld?

Decibel Meter ships an update every 3 months, and iSecretWorld daily. Most recently, Decibel Meter was updated on November 9, 2026 and iSecretWorld 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.*