# Low Frequency Detector vs SCT Calculator 3

The clearest difference is price: SCT Calculator 3 at $0.99 against Low Frequency Detector's $9.99. SCT Calculator 3 also leads on device support (3 vs 1) and iOS requirement (13.0 vs 26.2). On update cadence, ads and in-app purchases there is nothing between them.

Low Frequency Detector costs $9.99 and SCT Calculator 3 $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Low Frequency Detector ships an update every 9 months, SCT Calculator 3 every 8 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Low Frequency Detector | SCT Calculator 3 |
| --- | --- | --- |
| Price | $9.99 | **$0.99** |
| Rating | **[2.8 (6 ratings)](https://appshunter.io/ios/app/low-frequency-detector/id1196584147/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 8 months** |
| Monetization | Paid | — |
| Size | 1 MB | 4 MB |
| Requires iOS | 26.2 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [Timothy Alan Verrelli](https://appshunter.io/developer/1761433304) |

## What reviewers say

### Low Frequency Detector

[App page](https://appshunter.io/ios/app/low-frequency-detector/id1196584147)

This tool measures and analyzes low-frequency sounds that are difficult for the human ear to detect. It helps identify potential noise pollution from sources like construction or factories, providing detailed reports on frequency components and sound levels.

**Highlights:** Low-frequency power level measurement (<100Hz), Audible band power level measurement (Leq), 1/3 octave band analysis (OCT), FFT analysis (FFT), Time course graph (TIME), Measurement report generation, Calibration function

**In-app purchases:** none


### SCT Calculator 3

[App page](https://appshunter.io/ios/app/sct-calculator-3/id6615060947)

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

**In-app purchases:** none


## Frequently asked questions

### Is Low Frequency Detector free?

Low Frequency Detector costs $9.99, with no in-app purchases.

### Is SCT Calculator 3 free?

SCT Calculator 3 costs $0.99, with no in-app purchases.

### Do Low Frequency Detector or SCT Calculator 3 have ads?

Neither Low Frequency Detector nor SCT Calculator 3 shows ads.

### Which is updated more often, Low Frequency Detector or SCT Calculator 3?

Low Frequency Detector ships an update every 9 months, and SCT Calculator 3 every 8 months. Most recently, Low Frequency Detector was updated on October 26, 2026 and SCT Calculator 3 on October 25, 2026.

---

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