# AcoustaLab: Decibel & Audio — Noise Meter & Speaker Checks

> Noise Meter & Speaker Checks (iPhone/iPad app by QINGDAO XUFAN ZHILIAN INFORMATION TECHNOLOGY CO. LTD..)

- Source: https://appshunter.io/ios/app/acoustalab-decibel-and-audio/id6763583795 (this page in markdown: same URL + `.md`)
- Developer: [QINGDAO XUFAN ZHILIAN INFORMATION TECHNOLOGY CO. LTD.](https://appshunter.io/developer/1888657658)
- Category: Utilities, Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-04-30
- Data updated: 2026-11-05

## What is AcoustaLab?

AcoustaLab combines everyday noise measurements with speaker and headphone checks in a local acoustic toolkit. Use the basic tools for measurements and listening checks, then choose Pro when you need advanced controls. No account or ads.

BASIC TOOLS THAT STAY FREE
• Measure environmental noise in dB with A/C/Z weighting, Fast/Slow response, Leq, minimum, maximum and duration. Name and annotate a stopped measurement, then export CSV.
• Capture watermarked photos with readings, units, weighting, response, time, statistics and input information. Keep them in the app or share them explicitly.
• Generate sine tones and unfiltered noise. Use fixed sweeps and guided checks for speakers, headphones and left/right channels.
• Save 10 measurements, 10 watermarked photos and 3 basic custom presets. Delete unwanted items to save again.

PRO TOOLS
• Square, triangle and sawtooth waveforms, plus custom, stepped and repeating sweeps.
• Noise filters and parameter controls.
• Rattle Finder: mark a candidate frequency during a slow sweep, fine-tune it and replay a steady tone to confirm by listening.
• A/B spectrum overlays and band differences between two captures.
• Loopback calibration and compensation, device and room projects, and more archive storage.

TRIAL AND PURCHASES
Explicitly start one 24-hour local Pro trial without payment. It never renews or charges automatically. Previously started trials retain their original expiry. After the trial or Pro access ends, basic tools remain available and existing records can still be viewed, managed and exported. Free limits never automatically delete your records.

Monthly and yearly Pro are Apple auto-renewable subscriptions. Lifetime Pro is a one-time purchase. All three plans include the same Pro features. Payment requires an explicit Apple purchase; available products and localized prices appear on Apple's purchase page. Subscriptions renew automatically unless canceled in your Apple subscription settings. Buying Lifetime does not automatically cancel an existing subscription; check Manage Apple subscriptions. Restore Purchases is available in Settings.

MEASUREMENT INFORMATION
Built-in iPhone microphone readings use a general sensitivity assumption and have not been independently validated for absolute accuracy on your phone. Display limits are not a verified measurement range. A reference sound-pressure calibration requires independent reference equipment and a stable source. External or unknown inputs may show relative digital dBFS; spectra are relative analyses. AcoustaLab does not claim occupational sound-level instrument certification or automatic hardware fault diagnosis.

PRIVACY AND CONTROL
Microphone input, photos, presets and archives are processed or stored on device without automatic upload to a developer server. Files leave the app only when you select a destination through a system share or export flow. The camera captures sound-level photos without reading your existing photo library or requesting location.

Start signal playback at a low system volume, increase gradually and consider the connected equipment.

Support: https://philyu8259-create.github.io/AcoustaLab/support-en.html
Privacy: https://philyu8259-create.github.io/AcoustaLab/privacy-policy-en.html
Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Contact: contact@xufanzhilian.com

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly Pro | $9.99 | per year |
| Monthly Pro | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Unlock | $19.99 | one-time |


## Is AcoustaLab safe?

Not enough ratings yet to assess AcoustaLab.

## Is AcoustaLab legit?

AcoustaLab: Decibel & Audio appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for AcoustaLab is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.10 — 2026-11-03

• Measure environmental noise in dB with live readings, A/C/Z weighting and sound-level statistics.
• Capture sound-level watermarked photos and save measurement records with notes and CSV export.
• Improved speaker/headphone checks, spectrum comparisons and interface usability.

### 1.9 — 2026-10-21

• Added Rattle Finder: mark a candidate frequency during a slow sweep, fine-tune it, replay a steady tone and narrow the search range.
• Keep the last spectrum after stopping capture, and save snapshots with capture time and measurement conditions.
• Compare saved spectra with A/B overlays, per-band differences and optional overall-level normalization.
• Organize spectra, listening findings and guided checks into device or room projects, with notes and CSV export.
• Improved capture restart, saved-record editing, long filenames and microphone cleanup when closing analysis.
• Refined English, Chinese and larger-text layouts.

### 1.8 — 2026-10-19

• Refined tone, sweep, and noise output, including cleaner high-frequency triangle waves and more stable playback.
• Added calibration quality checks to reduce the impact of noise, clipping, and incomplete measurements.
• Improved guided tests so progress follows actual playback and interrupted steps can be restarted.
• Made presets, test history, and calibration data more reliable to save and recover.
• Improved spectrum analysis and audio session coordination, with better resource handling after playback stops.
• Improved purchase and restore status messages, large text, and accessibility.

### 1.7 — 2026-09-11

• Frequency output now adapts to the device sample rate to prevent aliasing outside the safe playback range.
• Reworked the real-time rendering and calibration path for lower callback overhead and more stable sweep, noise, and compensation behavior.
• Upgraded the RTA with Hann-windowed vDSP band-power analysis for more accurate third-octave and low-frequency results.
• Improved interruption, route-change, and media-services recovery to reduce the risk of unintended speaker output.
• Improved digital headroom, settings persistence, VoiceOver, and Reduce Motion support.

### 1.6 — 2026-08-10

• Added guided acoustic test flows and test history for reference tone, sweep, noise, channel, and low-frequency checks.
• Sweep playback now supports single, fixed-count, and continuous loops with direction and interval controls.
• Share bilingual test result cards, and import or export custom presets.
• Share calibration reports as PDF, CSV, or response-curve PNG files.

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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 2026-11-05.*