# AIS eMemo vs Decibel

The clearest difference is in-app purchases: AIS eMemo at none against Decibel's 3. AIS eMemo also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.0). Decibel's advantage is update cadence (every 2 days vs every 2 months). On price and device support there is nothing between them.

Both are free to download. Decibel sells 3 in-app purchases, starting at $5.99 per 7 days. AIS eMemo asks for nothing beyond the download.

AIS eMemo ships an update every 2 months, Decibel every 2 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | AIS eMemo | Decibel |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 19 MB | 81 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mimo Tech](https://appshunter.io/developer/611091645) | [IMAD EDDINE EL QSIMI](https://appshunter.io/developer/1873780945) |

## What reviewers say

### AIS eMemo

[App page](https://appshunter.io/ios/app/ais-ememo/id1499972222)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel

[App page](https://appshunter.io/ios/app/decibel-sound-meter-pro/id6801904741)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bd Meter Premium Weekly | $5.99 | per 7 days |
| Bd Meter Premium Monthly | $9.99 | per month |
| Bd Meter Premium Yearly | $14.99 | per year |


## Frequently asked questions

### Is AIS eMemo free?

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

### Is Decibel free?

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

### Do AIS eMemo or Decibel have ads?

Decibel shows ads; AIS eMemo does not.

### Which is updated more often, AIS eMemo or Decibel?

AIS eMemo ships an update every 2 months, and Decibel every 2 days. Most recently, AIS eMemo was updated on November 7, 2026 and Decibel 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.*