# Classicalc calculator vs Low Frequency Detector

The clearest difference is rating: Classicalc calculator at 3.8 against Low Frequency Detector's 2.8. Classicalc calculator also leads on price ($0.99 vs $9.99) and review sentiment (63% vs 50%). Low Frequency Detector's advantage is update cadence (every 9 months vs every 20 months). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

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

Classicalc calculator holds the better App Store score, 3.8 against 2.8. Both are backed by a comparable volume of ratings — 13 and 6 respectively. Written reviews point the same way: 63% of Classicalc calculator's written reviews are positive against 50% of Low Frequency Detector's.

Classicalc calculator ships an update every 20 months, Low Frequency Detector every 9 months. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Classicalc calculator | Low Frequency Detector |
| --- | --- | --- |
| Price | **$0.99** | $9.99 |
| Rating | **[3.8 (13 ratings)](https://appshunter.io/ios/app/classicalc-calculator/id989434780/reviews)** | [2.8 (6 ratings)](https://appshunter.io/ios/app/low-frequency-detector/id1196584147/reviews) |
| Number of ratings | **13** | 6 |
| Positive reviews | **62.5% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 9 months** |
| Monetization | Paid | Paid |
| Size | 14 MB | 1 MB |
| Requires iOS | **12.0** | 26.2 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Lukasz Kowalski](https://appshunter.io/developer/792954012) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### Classicalc calculator

[App page](https://appshunter.io/ios/app/classicalc-calculator/id989434780)

This calculator app offers instant calculations as you type, following the mathematical order of operations. It features unique piano sound themes and allows seamless continuation of calculations across iPhone and Apple Watch. Your equations are automatically saved for convenience.

**Highlights:** Instant calculation as you type, Mathematical order of operators, Cross-device continuity (iPhone/Watch), Automatic equation saving, 14 piano sound themes, Copy result to clipboard

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Classicalc calculator free?

Classicalc calculator costs $0.99, with no in-app purchases.

### Is Low Frequency Detector free?

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

### Which has better reviews, Classicalc calculator or Low Frequency Detector?

Classicalc calculator is rated higher. Classicalc calculator averages 3.8 out of 5 from 13 ratings, while Low Frequency Detector averages 2.8 from 6 ratings.

### Do Classicalc calculator or Low Frequency Detector have ads?

Neither Classicalc calculator nor Low Frequency Detector shows ads.

### Which is updated more often, Classicalc calculator or Low Frequency Detector?

Classicalc calculator ships an update every 20 months, and Low Frequency Detector every 9 months. Most recently, Classicalc calculator was updated on October 3, 2026 and Low Frequency Detector on October 6, 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.*