# Frequency Detector Tool vs Spectrum

The clearest difference is in-app purchases: Frequency Detector Tool at none against Spectrum's 1. Frequency Detector Tool also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Spectrum sells 1 one-off in-app purchase. Frequency Detector Tool asks for nothing beyond the download.

## The numbers

| Metric | Frequency Detector Tool | Spectrum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/frequency-detector-tool/id6786799596/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 8 days |
| Monetization | Free | — |
| Size | 9 MB | 89 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eye Heru](https://appshunter.io/developer/6786799838) | [SEONYONG LEE](https://appshunter.io/developer/6775892940) |

## What reviewers say

### Frequency Detector Tool

[App page](https://appshunter.io/ios/app/frequency-detector-tool/id6786799596)

Instantly analyze musical keys from any frequency in Hertz. It displays the corresponding musical note, cents deviation, and whether it's in key with your selected musical scale. Features vocal context notes and a full frequency chart for EQ guidance.

**Highlights:** Frequency to musical note conversion, Cents sharp/flat indication, In-key analysis for selected keys, Nearest cut candidate identification, Vocal context notes for EQ, Full frequency chart exploration, Solfeggio frequencies with associations

**Features:** macOS Compatibility

**In-app purchases:** none


### Spectrum

[App page](https://appshunter.io/ios/app/spectrum-audio-analyzer/id6787894411)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Frequency Detector Tool free?

Frequency Detector Tool is free to download, with no in-app purchases.

### Is Spectrum free?

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

### Do Frequency Detector Tool or Spectrum have ads?

Spectrum shows ads; Frequency Detector Tool does not.

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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.*