# Wavelet Voice Sonogram vs FFT Analyzer

The clearest difference is update cadence: FFT Analyzer at every 4 months against Wavelet Voice Sonogram's every 8 months. FFT Analyzer also leads on price ($4.99 vs $6.99) and iOS requirement (17.6 vs 26.2). On ads, in-app purchases and device support there is nothing between them.

Wavelet Voice Sonogram costs $6.99 and FFT Analyzer $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Wavelet Voice Sonogram ships an update every 8 months, FFT Analyzer every 4 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Wavelet Voice Sonogram | FFT Analyzer |
| --- | --- | --- |
| Price | $6.99 | **$4.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 months** |
| Size | 0 MB | 3 MB |
| Requires iOS | 26.2 | **17.6** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [Kurenz Music GbR](https://appshunter.io/developer/544695186) |

## What reviewers say

### Wavelet Voice Sonogram

[App page](https://appshunter.io/ios/app/wavelet-voice-sonogram/id1574131130)

**In-app purchases:** none


### FFT Analyzer

[App page](https://appshunter.io/ios/app/fft-analyzer/id6760554712)

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

**In-app purchases:** none


## Frequently asked questions

### Is Wavelet Voice Sonogram free?

Wavelet Voice Sonogram costs $6.99, with no in-app purchases.

### Is FFT Analyzer free?

FFT Analyzer costs $4.99, with no in-app purchases.

### Do Wavelet Voice Sonogram or FFT Analyzer have ads?

Neither Wavelet Voice Sonogram nor FFT Analyzer shows ads.

### Which is updated more often, Wavelet Voice Sonogram or FFT Analyzer?

Wavelet Voice Sonogram ships an update every 8 months, and FFT Analyzer every 4 months. Most recently, Wavelet Voice Sonogram was updated on November 3, 2026 and FFT Analyzer on November 5, 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.*