# Frequency Analyzer vs Welding Heat Input Calculator

The clearest difference is price: Frequency Analyzer at Free against Welding Heat Input Calculator's $9.99. Frequency Analyzer also leads on update cadence (every 8 days vs every 6 months) and iOS requirement (17.2 vs 26.2). Welding Heat Input Calculator's advantage is in-app purchases (none vs 11). On ads and device support there is nothing between them.

Frequency Analyzer is free to download; Welding Heat Input Calculator costs $9.99 up front. Frequency Analyzer sells 11 in-app purchases, starting at $2.99 per 7 days. Welding Heat Input Calculator asks for nothing beyond the download.

Frequency Analyzer ships an update every 8 days, Welding Heat Input Calculator every 6 months. The most recent releases landed on September 27, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Frequency Analyzer | Welding Heat Input Calculator |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.5 (166 ratings)](https://appshunter.io/ios/app/frequency-analyzer/id6468837339/reviews)** | — |
| Number of ratings | **166** | — |
| Positive reviews | 10.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 35 MB | 1 MB |
| Requires iOS | **17.2** | 26.2 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Manfred Kuegel](https://appshunter.io/developer/1520736594) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### 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 |


### Welding Heat Input Calculator

[App page](https://appshunter.io/ios/app/welding-heat-input-calculator/id6760613465)

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

**In-app purchases:** none


## Frequently asked questions

### Is Frequency Analyzer free?

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

### Is Welding Heat Input Calculator free?

Welding Heat Input Calculator costs $9.99, with no in-app purchases.

### Do Frequency Analyzer or Welding Heat Input Calculator have ads?

Neither Frequency Analyzer nor Welding Heat Input Calculator shows ads.

### Which is updated more often, Frequency Analyzer or Welding Heat Input Calculator?

Frequency Analyzer ships an update every 8 days, and Welding Heat Input Calculator every 6 months. Most recently, Frequency Analyzer was updated on September 27, 2026 and Welding Heat Input Calculator on September 24, 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.*