# LowFreq — Sound level & hum spectrum

> Sound level & hum spectrum (iPhone/iPad app by 俊逸 张.)

- Source: https://appshunter.io/ios/app/lowfreq/id6825242069 (this page in markdown: same URL + `.md`)
- Developer: [俊逸 张](https://appshunter.io/developer/6800539433)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-10-22
- Data updated: 2026-10-25

## What is LowFreq?

LowFreq is a simple, free sound level meter with a detailed low-frequency spectrum.

- CURRENT LEVEL
A-weighted sound level in dB(A), averaged over the last second (equivalent continuous level), plus the unweighted level. A-weighting follows the IEC 61672-1 formula.

- STATISTICS
Average level (LAeq) since you started, the maximum, and elapsed time. Tap reset to start over.

- LOW-FREQUENCY SPECTRUM
20–400 Hz at about 1.5 Hz resolution. Tap any peak to read its exact frequency and level, handy for spotting a hum from a transformer, pump or fan.

- CALIBRATION
Phone microphones differ from one device to another. Compare with a calibrated sound level meter and adjust the offset in 0.1 dB steps.

Privacy: sound is analyzed live on your iPhone. Nothing is recorded, saved or uploaded. No account, no ads, no tracking, no in-app purchases.

Note: each point of the spectrum covers only about 1.5 Hz, so it reads much lower than the overall level. The app interface is currently in Chinese.

## Is LowFreq safe?

Not enough ratings yet to assess LowFreq.

## Is LowFreq legit?

LowFreq has limited verification signals. The AppsHunter Legitimacy Score for LowFreq is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-22

No release notes.

## More apps by 俊逸 张

- [Vana](https://appshunter.io/ios/app/vana/id6800771281)
- [Pickroom](https://appshunter.io/ios/app/pickroom/id6814711978)

All apps by 俊逸 张: https://appshunter.io/developer/6800539433

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*