# Low Frequency Detector vs HM01

The clearest difference is price: HM01 at Free against Low Frequency Detector's $9.99. HM01 also leads on update cadence (fortnightly vs every 9 months) and iOS requirement (12.0 vs 26.2). On ads, in-app purchases and device support there is nothing between them.

HM01 is free to download; Low Frequency Detector costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Low Frequency Detector ships an update every 9 months, HM01 fortnightly. The most recent releases landed on September 18, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Low Frequency Detector | HM01 |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| 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 | **Fortnightly** |
| Monetization | Paid | — |
| Size | 1 MB | 115 MB |
| Requires iOS | 26.2 | **12.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [ShanTou City Vison Electronictechnology Co., Ltd.](https://appshunter.io/developer/1388222999) |

## 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


### HM01

[App page](https://appshunter.io/ios/app/hm01/id6749028679)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Low Frequency Detector free?

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

### Is HM01 free?

HM01 is free to download, with no in-app purchases.

### Do Low Frequency Detector or HM01 have ads?

Neither Low Frequency Detector nor HM01 shows ads.

### Which is updated more often, Low Frequency Detector or HM01?

Low Frequency Detector ships an update every 9 months, and HM01 fortnightly. Most recently, Low Frequency Detector was updated on September 18, 2026 and HM01 on June 10, 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.*