# Zen Calculator vs Frequency Analyzer

The clearest difference is iOS requirement: Zen Calculator at 12.4 against Frequency Analyzer's 17.2. On price and in-app purchases there is nothing between them.

Both are free to download. Zen Calculator sells 1 one-off in-app purchase and Frequency Analyzer sells 11 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Zen Calculator | Frequency Analyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (169 ratings)](https://appshunter.io/ios/app/frequency-analyzer/id6468837339/reviews)** |
| Number of ratings | — | **169** |
| Positive reviews | — | 10.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 8 days |
| Monetization | — | Free with in-app purchases |
| Size | 13 MB | 35 MB |
| Requires iOS | **12.4** | 17.2 |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Attard](https://appshunter.io/developer/1677333166) | [Manfred Kuegel](https://appshunter.io/developer/1520736594) |

## What reviewers say

### Zen Calculator

[App page](https://appshunter.io/ios/app/zen-calculator/id6462659226)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Supporting the devs work | $0.99 | one-time |


### Frequency Analyzer

[App page](https://appshunter.io/ios/app/frequency-analyzer/id6468837339)

Transform your device into a professional audio analysis tool with advanced FFT analysis, SPL monitoring, and detailed visualizations. Record, analyze, and export audio data with precision calibration and multiple weighting filters.

**Highlights:** Real-time FFT analysis, Calibrated SPL measurements, 32-bit float audio recording, Synchronized video recording, Spectrogram and octave band analysis, Export WAV, CSV, images, and videos

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

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Frequency Analyzer Pro Weekly | $2.99 | per 7 days |
| Frequency Analyzer Pro Monthly | $3.99 | per month |
| Frequency Analyzer Pro Monthly | $3.99 | per month |
| Frequency Analyzer Pro Monthly | $4.99 | per month |
| Frequency Analyzer Pro Monthly | $4.99 | per month |
| Frequency Analyzer Pro Monthly | $4.99 | per month |
| Frequency Analyzer Pro Annual | $29.99 | per year |
| Frequency Analyzer Pro Annual | $44.99 | per year |
| Frequency Analyzer Pro Annual | $44.99 | per year |
| Frequency Analyzer Pro Annual | $44.99 | per year |
| Pro access for lifetime | $89.99 | one-time |


## Frequently asked questions

### Is Zen Calculator free?

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

### Is Frequency Analyzer free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*