# Low Frequency Detector vs ずっと二人で

The clearest difference is price: ずっと二人で at Free against Low Frequency Detector's $9.99. ずっと二人で also leads on iOS requirement (10.3 vs 26.2). Low Frequency Detector's advantage is in-app purchases (none vs 2).

ずっと二人で is free to download; Low Frequency Detector costs $9.99 up front. ずっと二人で sells 2 one-off in-app purchases. Low Frequency Detector asks for nothing beyond the download.

## The numbers

| Metric | Low Frequency Detector | ずっと二人で |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | — |
| Update frequency | Every 9 months | — |
| Monetization | Paid | — |
| Size | 1 MB | 43 MB |
| Requires iOS | 26.2 | **10.3** |
| Devices | **iPhone** | — |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [SHINGO MATSUO](https://appshunter.io/developer/1493414113) |

## 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


### ずっと二人で

[App page](https://appshunter.io/ios/app/id1569067682)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| アプリ内の広告削除 | $1.99 | one-time |
| 開発者を支援 | $1.99 | one-time |


## Frequently asked questions

### Is Low Frequency Detector free?

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

### Is ずっと二人で free?

ずっと二人で is free to download, with in-app purchases available.

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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.*