# GRBASZero — GRBAS Scale Analysis

> Voice analysis app for hoarseness estimation using GRBAS scale. (iPhone/iPad app by ENTZERO, LIMITED LIABILITY CO..)

- Source: https://appshunter.io/ios/app/grbaszero/id1490666100 (this page in markdown: same URL + `.md`)
- Developer: [ENTZERO, LIMITED LIABILITY CO.](https://appshunter.io/developer/1719962125)
- Category: Education, Medical
- Price: Free
- Age rating: 12+
- Requires: iOS 13.0 · 30 MB
- Languages: English
- Released: 2020-03-09
- Data updated: 2026-06-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/grbaszero/id1490666100/reviews.md

## What is GRBASZero?

Machine learning is performed based on voice data collected at the Department of Otolaryngology, Tenri Yorozu Hospital, and the generated learning model was built-in this app.
When the long vowel sound "A" is uttered, this app displays an estimation based on GRBAS scale, which is an auditory-perceptual evaluation method for hoarseness of the Japan Society of Logopedics and Phoniatrics.

## Key features

- Voice data analysis
- GRBAS scale estimation
- Machine learning model
- Hoarseness evaluation
- Long vowel sound analysis

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/grbaszero/id1490666100/reviews.md

### 1/5 — Not accurate

*2025-12-11*

Well, I appear to have a constantly grade 3 roughness and I don’t have a voice disorder. This is the problem when trying to automate a subjective measure.

## Frequently asked questions about GRBASZero

### What is GRBASZero?

GRBASZero is an application that performs machine learning-based analysis of voice data to estimate hoarseness according to the GRBAS scale. It was developed using data from Tenri Yorozu Hospital's Department of Otolaryngology.

### How does GRBASZero estimate hoarseness?

GRBASZero estimates hoarseness by analyzing the long vowel sound "A" when uttered by the user. This estimation is based on the GRBAS scale, a recognized auditory-perceptual evaluation method for hoarseness.

### What is the GRBAS scale?

The GRBAS scale is an auditory-perceptual evaluation method for hoarseness developed by the Japan Society of Logopedics and Phoniatrics. It assesses different aspects of vocal quality to determine the degree of hoarseness.

### What devices is GRBASZero compatible with?

GRBASZero is compatible with iPhone, iPad, and iPod devices. It is available for users with iOS devices.

### Is GRBASZero free to use?

Yes, GRBASZero is available for free. There are no costs associated with downloading or using the core features of the application.

### When was GRBASZero last updated?

GRBASZero was last updated on May 18, 2020, with version 1.2. The initial release date was March 9, 2020.

### What is the age rating for GRBASZero?

GRBASZero has an age rating of 12+. This indicates that the content is generally suitable for users aged 12 and older.

### Does GRBASZero have ads?

No, GRBASZero does not contain advertisements. The application is ad-free, providing an uninterrupted user experience.

## Version history (last 3 releases)

### 1.2 — 2020-05-18

The design of the graph has been changed.

### 1.1 — 2020-04-01

アプリ名を変更しました

### 1.0 — 2020-03-10

No release notes.

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## More apps by ENTZERO, LIMITED LIABILITY CO.

- [FacialPalsyZero](https://appshunter.io/ios/app/facialpalsyzero/id1493697509)

All apps by ENTZERO, LIMITED LIABILITY CO.: https://appshunter.io/developer/1719962125

## Related topics

[grbaszero](https://appshunter.io/ios/topics/grbaszero)

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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 2026-06-03.*