# Effect vs Decibel Meter Pro

The clearest difference is in-app purchases: Effect at none against Decibel Meter Pro's 1. Effect also leads on ads (none vs shown) and iOS requirement (9.0 vs 17.6). On price, update cadence and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 4 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | Effect | Decibel Meter Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (2 ratings)](https://appshunter.io/ios/app/decibel-meter-pro-sound-level/id6779537617/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | — | Free with in-app purchases |
| Size | 12 MB | 11 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GUANDDONG TIANPU TECHNOLOGY GROUP CO.,LTD.](https://appshunter.io/developer/1637560013) | [Alper Sumer Guc](https://appshunter.io/developer/1896672915) |

## What reviewers say

### Effect

[App page](https://appshunter.io/ios/app/effect/id6758289667)

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

**In-app purchases:** none


### Decibel Meter Pro

[App page](https://appshunter.io/ios/app/decibel-meter-pro-sound-level/id6779537617)

Transform your device into a professional sound level meter to measure noise in dB, dBA, and dBC. Analyze real-time spectrums, protect your hearing with noise dose tracking, and record, prove, and share measurements with detailed reports.

**Highlights:** Real-time spectrum analyzer, Noise dose tracking, Save and playback audio recordings, Export CSV and PDF reports, Calibration for accuracy, Light and dark modes

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Effect free?

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

### Is Decibel Meter Pro free?

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

### Do Effect or Decibel Meter Pro have ads?

Decibel Meter Pro shows ads; Effect does not.

### Which is updated more often, Effect or Decibel Meter Pro?

Effect ships an update every 4 days, and Decibel Meter Pro every 4 days. Most recently, Effect was updated on October 25, 2026 and Decibel Meter Pro on October 25, 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.*