# SoundMaster SLM — The accurate sound level meter

> The accurate sound level meter (iPhone/iPad app by Lazaros Vrysis.)

- Source: https://appshunter.io/ios/app/soundmaster-slm/id1273113441 (this page in markdown: same URL + `.md`)
- Developer: [Lazaros Vrysis](https://appshunter.io/developer/426938172)
- Category: Utilities, Music
- Price: $4.99
- Age rating: 4+
- Requires: iOS 11.0 · 39 MB
- Languages: English
- Released: 2017-12-15
- Data updated: 2025-01-09
- User reviews in markdown: https://appshunter.io/ios/app/soundmaster-slm/id1273113441/reviews.md

## What is SoundMaster SLM?

• Overview
- SoundMaster aims at delivering the most robust sound level measurement readings on the App Store
- Audio data is captured directly from input buffers, ensuring a robust and responsive measurement output
- Features state-of-the-art algorithmic implementations, ensuring high-accuracy readings
- UI is polished to perfection, delivering professional-grade user experience
- Comes pre-calibrated using reference equipment

• Main Features
- Professional sound level measurement capabilities
- Advanced calibration and equalization support
- Extended measurements management

• Under the hood
- 44.1kHz/32bit raw audio recording
- 20Hz to 20kHz frequency response
- 90dB dynamic range, from 25dB to 115dB SPL[A]
- ±1.4dB accuracy @25dB-115dB SPL[A]
- Low latency and processing-loss spectral analyzer
- Audio I/O latencies monitoring and compensation

• Noise Measurements
- Digital VU and numeric visualizations
- Broadband RMS, Peak, Max, Min, Leq and measurement duration data handling
- Impulsive, Fast and Slow response modes
- A, B, C, D, Z weighting filters

• Advanced Calibration
- Calibrated and equalized for all iPhone models
- Calibrated for the MicW i436, as an external input source
- Calibration data is OTA (Over the Air) updated
- Additional user calibration and equalization banks for both embedded microphone and external input source
- Custom octave-based gain adjustment support

• Session Management
- Frame-based time-series of measurement data handling
- Overall statistics calculation for noise measurements
- Photo capture capability
- Time and geolocation awareness support
- Title, location and comments metadata support
- Audio recording (CAF format), measurement data (CSV format) and metadata export capabilities

• Additional Capabilities
- Option for keeping the device awake during recording
- Option for auto-stopping measurements after a pre-configured duration
- Background recording capability
- Upside down orientation support


## Version history (last 4 releases)

### 1.3.2 — 2021-04-30

Resolved an issue with dark mode.

### 1.3.0 — 2021-03-28

Updated for iOS 14.

### 1.1.0 — 2017-12-18

A recording indicator was added

### 1.0.0 — 2017-12-11

No release notes.

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## More apps by Lazaros Vrysis

- [Kiss or Miss - A thousand ways to live a date](https://appshunter.io/ios/app/kiss-or-miss/id882772875)
- [Army Knife](https://appshunter.io/ios/app/army-knife/id942291511)
- [SoundMaster RTA](https://appshunter.io/ios/app/soundmaster-rta/id1273125700)
- [SoundMaster ISA](https://appshunter.io/ios/app/soundmaster-isa/id1273127092)
- [SoundMaster RVA](https://appshunter.io/ios/app/soundmaster-rva/id1291725677)

All apps by Lazaros Vrysis: https://appshunter.io/developer/426938172

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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 2025-01-09.*