# Low Frequency Detector vs Decibel dB

The clearest difference is price: Decibel dB at Free against Low Frequency Detector's $9.99. Decibel dB also leads on rating (4.7 vs 2.8) and review sentiment (77% vs 50%). Low Frequency Detector's advantage is in-app purchases (none vs 6). On ads and device support there is nothing between them.

Decibel dB is free to download; Low Frequency Detector costs $9.99 up front. Decibel dB sells 6 in-app purchases, starting at $3.99 per 7 days. Low Frequency Detector asks for nothing beyond the download.

Decibel dB holds the better App Store score, 4.7 against 2.8. That said, the two scores are not equally well evidenced: Decibel dB has 684 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 50% of Low Frequency Detector's written reviews are positive against 77% of Decibel dB's.

Low Frequency Detector ships an update every 9 months, Decibel dB every 4 months. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Low Frequency Detector | Decibel dB |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [2.8 (6 ratings)](https://appshunter.io/ios/app/low-frequency-detector/id1196584147/reviews) | **[4.7 (684 ratings)](https://appshunter.io/ios/app/decibel-db-sound-level-meter/id1644852399/reviews)** |
| Number of ratings | 6 | **684** |
| Positive reviews | 50.0% of reviews | **77.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | **Paid** | Subscription |
| Size | 1 MB | 32 MB |
| Requires iOS | 26.2 | **12.4** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [ITincubator UAB](https://appshunter.io/developer/1617775851) |

## 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


### Decibel dB

[App page](https://appshunter.io/ios/app/decibel-db-sound-level-meter/id1644852399)

Measure ambient noise and sound levels in real-time with this tool. It helps control noise pollution and protect user health by displaying decibel values numerically and graphically. Track exposure over time with NIOSH and OSHA compliant measurements.

**Highlights:** Measure noise in decibels (dB), Track MIN, AVG, MAX sound levels, Record and export measurements, Overlay noise levels on photos/videos, NIOSH and OSHA compliant meter

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sound Level Meter Pro | $3.99 | per 7 days |
| Weekly Access | $3.99 | per 7 days |
| Decibel Meter: Pro Version | $6.99 | per month |
| Monthly Access | $6.99 | per month |
| Noise Level Meter (dB) Pro | $12.99 | per year |
| Yearly Access | $12.99 | per year |

**What reviewers like**

- 👍 Accurate and reliable measurements
- 🚀 Easy to use interface
- 💡 Innovative features like photo/video noise overlay
- 👍 Compliant with industry standards
- 👍 Detailed noise tracking and monitoring

**What reviewers complain about**

- 🐛 Inconsistent accuracy compared to other apps
- 🐛 Doesn't detect loud noises accurately

**Reported bugs**

- Inaccurate decibel readings in some environments
- Occasional crashes or freezes

**Requested features**

- Ability to record and export noise measurements
- Integration with smart home devices


## Frequently asked questions

### Is Low Frequency Detector free?

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

### Is Decibel dB free?

Decibel dB is free to download, with in-app purchases available.

### Which has better reviews, Low Frequency Detector or Decibel dB?

Decibel dB is rated higher. Low Frequency Detector averages 2.8 out of 5 from 6 ratings, while Decibel dB averages 4.7 from 684 ratings.

### Do Low Frequency Detector or Decibel dB have ads?

Neither Low Frequency Detector nor Decibel dB shows ads.

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

Low Frequency Detector ships an update every 9 months, and Decibel dB every 4 months. Most recently, Low Frequency Detector was updated on October 26, 2026 and Decibel dB on October 30, 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.*