# FFT Plot vs Sound Decibel Meter

The clearest difference is price: Sound Decibel Meter at Free against FFT Plot's $9.99. Sound Decibel Meter also leads on update cadence (every 2 months vs every 17 months) and ratings volume (336 vs 90). FFT Plot's advantage is review sentiment (84% vs 40%) and in-app purchases (none vs 2). On ads and device support there is nothing between them.

Sound Decibel Meter is free to download; FFT Plot costs $9.99 up front. Sound Decibel Meter sells 2 in-app purchases, starting at $4.99 per month. FFT Plot asks for nothing beyond the download.

FFT Plot holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 90 and 336 respectively. Written reviews point the same way: 84% of FFT Plot's written reviews are positive against 40% of Sound Decibel Meter's.

FFT Plot ships an update every 17 months, Sound Decibel Meter every 2 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | FFT Plot | Sound Decibel Meter |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (90 ratings)](https://appshunter.io/ios/app/fft-plot/id569468015/reviews)** | [4.5 (336 ratings)](https://appshunter.io/ios/app/sound-decibel-meter-nioshosha/id1571075296/reviews) |
| Number of ratings | 90 | **336** |
| Positive reviews | **84.4% of reviews** | 40.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 months** |
| Monetization | **Free** | Subscription |
| Size | 7 MB | 18 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [ONYX Apps](https://appshunter.io/developer/356553882) | [Arpenik Katikyan](https://appshunter.io/developer/1613951852) |

## What reviewers say

### FFT Plot

[App page](https://appshunter.io/ios/app/fft-plot/id569468015)

This real-time audio analysis app provides precision sound measurement and visualization. It's ideal for detecting sound issues, room tuning, and speaker calibration, offering detailed frequency analysis for musicians and audio professionals.

**Highlights:** Real-time audio analysis, Frequency detection, Averaging options, Window functions, Linear and logarithmic scales, Weighting options, Draggable cursors

**In-app purchases:** none


### Sound Decibel Meter

[App page](https://appshunter.io/ios/app/sound-decibel-meter-nioshosha/id1571075296)

Measure ambient noise levels with this clear, simple, and accurate app. It helps you monitor hearing health by detecting noise types, analyzing sound pressure, and syncing data with your Health app. Features include recording, sharing, and adherence to OSHA/NIOSH standards.

**Highlights:** Smart AI noise meter, Accurate sound pressure measurements, Sync with Health app, Sound recording and data saving, OSHA and NIOSH standards, Measurement range 20db to 160db, Microphone calibration

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spectrogram-noise level tools | $4.99 | per month |
| Spectrogram-noise level tools | $5.99 | per month |


## Frequently asked questions

### Is FFT Plot free?

FFT Plot costs $9.99, with no in-app purchases.

### Is Sound Decibel Meter free?

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

### Which has better reviews, FFT Plot or Sound Decibel Meter?

FFT Plot is rated higher. FFT Plot averages 4.8 out of 5 from 90 ratings, while Sound Decibel Meter averages 4.5 from 336 ratings.

### Do FFT Plot or Sound Decibel Meter have ads?

Neither FFT Plot nor Sound Decibel Meter shows ads.

### Which is updated more often, FFT Plot or Sound Decibel Meter?

FFT Plot ships an update every 17 months, and Sound Decibel Meter every 2 months. Most recently, FFT Plot was updated on October 29, 2026 and Sound Decibel Meter on October 30, 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.*