# SimpleFFT vs Decibel Meter Ultra

The clearest difference is ads: Decibel Meter Ultra at none against SimpleFFT's shown. Decibel Meter Ultra also leads on update cadence (every 10 days vs every 18 months). SimpleFFT's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.6). On price and in-app purchases there is nothing between them.

Both are free to download. SimpleFFT sells 1 one-off in-app purchase and Decibel Meter Ultra sells 4 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

SimpleFFT ships an update every 18 months, Decibel Meter Ultra every 10 days. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | SimpleFFT | Decibel Meter Ultra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (2.6K ratings)](https://appshunter.io/ios/app/decibel-meter-ultra/id1643525961/reviews)** |
| Number of ratings | — | **2.6K** |
| Positive reviews | — | 43.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 18 months | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 92 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | +12 |
| Developer | [HIROFUMI MARUO](https://appshunter.io/developer/667820705) | [Ultrafine](https://appshunter.io/developer/1558108175) |

## What reviewers say

### SimpleFFT

[App page](https://appshunter.io/ios/app/simplefft/id1239257017)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Functions | $0.49 | one-time |


### Decibel Meter Ultra

[App page](https://appshunter.io/ios/app/decibel-meter-ultra/id1643525961)

Measure, record, and analyze sound levels in your environment. This app offers precision metering, noise elimination tools, hearing protection features, and home audio calibration. It provides detailed reports and can be used with device microphones or external ones.

**Highlights:** Precision sound level metering, Noise logging and reporting, Hearing protection dosimeter, Fractional octave band analysis, Real-time analyzer, External microphone support

**Features:** iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Access | $7.99 | per 7 days |
| PRO Access | $11.99 | per month |
| PRO Access | $39.99 | per year |
| PRO Access | $39.99 | per year |

**What reviewers like**

- 🎨 Aesthetically pleasing design
- 🔍 Useful noise monitoring features
- 🔍 Ability to collect noise evidence

**What reviewers complain about**

- 💰 Expensive subscription pricing
- 🚫 Misleading free trial claims
- 🚫 Difficult to cancel subscription
- 🔍 Inconsistent noise level readings

**Reported bugs**

- Subscription charges continue after cancellation
- Subscription cancellation page doesn't load

**Requested features**

- Lower subscription pricing
- Improve subscription cancellation process


## Frequently asked questions

### Is SimpleFFT free?

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

### Is Decibel Meter Ultra free?

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

### Do SimpleFFT or Decibel Meter Ultra have ads?

SimpleFFT shows ads; Decibel Meter Ultra does not.

### Which is updated more often, SimpleFFT or Decibel Meter Ultra?

SimpleFFT ships an update every 18 months, and Decibel Meter Ultra every 10 days. Most recently, SimpleFFT was updated on November 6, 2026 and Decibel Meter Ultra on November 7, 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.*