# Spectrum Analyzer+ Audio FFT vs Caliber dB

The clearest difference is in-app purchases: Spectrum Analyzer+ Audio FFT at none against Caliber dB's 1. Spectrum Analyzer+ Audio FFT also leads on update cadence (every 5 days vs every 2 months). Caliber dB's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. Caliber dB sells 1 in-app purchase, starting at $4.99 per month. Spectrum Analyzer+ Audio FFT asks for nothing beyond the download.

Spectrum Analyzer+ Audio FFT ships an update every 5 days, Caliber dB every 2 months. Both last shipped on November 5, 2026.

## The numbers

| Metric | Spectrum Analyzer+ Audio FFT | Caliber dB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (5 ratings)](https://appshunter.io/ios/app/spectrum-analyzer-plus-audio-fft/id6760830858/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 95 MB | 54 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Kyu-Hee Jang](https://appshunter.io/developer/1587578867) | [TechHealth](https://appshunter.io/developer/1882482562) |

## What reviewers say

### Spectrum Analyzer+ Audio FFT

[App page](https://appshunter.io/ios/app/spectrum-analyzer-plus-audio-fft/id6760830858)

Analyze live audio frequencies from your device's microphone. Identify peak frequencies, hums, and room modes with detailed spectrum views and capture analysis. Compare sound changes over time and export data for further study.

**Highlights:** Live frequency spectrum display, 5-second capture and analysis, Peak frequency and level identification, Adjustable dB range, Comparison of sound changes, Specialized analysis modes (Voice, Machine, Room), CSV export

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

**In-app purchases:** none


### Caliber dB

[App page](https://appshunter.io/ios/app/caliber-db-sound-level-meter/id6760972677)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |


## Frequently asked questions

### Is Spectrum Analyzer+ Audio FFT free?

Spectrum Analyzer+ Audio FFT is free to download, with no in-app purchases.

### Is Caliber dB free?

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

### Do Spectrum Analyzer+ Audio FFT or Caliber dB have ads?

Spectrum Analyzer+ Audio FFT shows ads; Caliber dB does not.

### Which is updated more often, Spectrum Analyzer+ Audio FFT or Caliber dB?

Spectrum Analyzer+ Audio FFT ships an update every 5 days, and Caliber dB every 2 months. Most recently, Spectrum Analyzer+ Audio FFT was updated on November 5, 2026 and Caliber dB 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.*