# SII

> Calculates Speech Intelligibility Index with live spectrum measurement. (iPhone/iPad app by JOHN HOU.)

- Source: https://appshunter.io/ios/app/sii/id834784885 (this page in markdown: same URL + `.md`)
- Developer: [JOHN HOU](https://appshunter.io/developer/834784888)
- Category: Business, Education
- Price: $4.99
- Rating: 4.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 1 MB
- Languages: English
- Released: 2014-03-13
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sii/id834784885/reviews.md

## What is SII?

Complete implementation of ASNI S3.5-1997 -- Methods For Calculation Of The Speech Intelligibility Index. The new version adds the capability for live measurements of speech and noise spectra.

## Key features

- Speech Intelligibility Index calculation
- ASNI S3.5-1997 standard implementation
- Live speech spectrum measurement
- Live noise spectrum measurement

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/sii/id834784885/reviews.md

### 4/5 — Please fix font contrast!

*2021-02-10, version 1.07*

This app is exactly what I was looking for.

BUT...

It's impossible to read the measurements!

The sample images in the app store use a normal easy-to-read black font for all results.

In the app on my iPhone, all results are in white font on the pale light blue-gray background. Impossible to read.

Please change the font contrast, or provide a setting for users to choose.

## Frequently asked questions about SII

### What is SII used for?

SII is used to calculate the Speech Intelligibility Index, a measure of how understandable speech is in a given acoustic environment. This app implements the ASNI S3.5-1997 standard for this calculation.

### Does SII offer live measurements?

Yes, the latest version of SII adds the capability for live measurements of both speech and noise spectra, allowing for real-time analysis.

### What devices does SII support?

SII is available for iPhone and iPod devices.

### How much does SII cost?

SII is a paid application, priced at $4.99.

### When was SII last updated?

The app was last updated on October 19, 2020, with version 1.07.

### What is the age rating for SII?

SII has an age rating of 4+, making it suitable for a wide range of users.

### What is the user rating for SII?

SII has a rating of 4.0 stars based on one user review.

### Is SII suitable for offline use?

The description does not specify offline functionality, but the core calculation of the Speech Intelligibility Index and live spectrum measurements suggest it may require an active environment for analysis.

## Version history (last 1 release)

### 1.07 — 2020-10-19

Support iOS 14.0 or earlier versions.

## Apps similar to SII

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Legends Barber Shop](https://appshunter.io/ios/app/legends-barber-shop/id728752138) | 4.8 (21) | Free | Business |
| [MyHub by Eventify](https://appshunter.io/ios/app/myhub-by-eventify/id1615728019) | — | Free | Business |
| [MytelHome](https://appshunter.io/ios/app/mytelhome/id1503462124) | 1.2 (33) | Free | Business |
| [Kramer Control](https://appshunter.io/ios/app/kramer-control/id1239914139) | 3.7 (12) | Free | Business |
| [Entheos](https://appshunter.io/ios/app/entheos/id1536300265) | 5.0 (1) | Free | Business |
| [SCPH](https://appshunter.io/ios/app/scph/id1191604426) | — | Free | Business |

## More apps by JOHN HOU

- [HearingZoom](https://appshunter.io/ios/app/hearingzoom/id1176264096)

All apps by JOHN HOU: https://appshunter.io/developer/834784888

---

*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 2026-06-10.*