# GRBASZero vs ReDi

The clearest difference is review sentiment: ReDi at 57% against GRBASZero's 0%. ReDi also leads on update cadence (every 6 days vs every 5 weeks). GRBASZero's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GRBASZero ships an update every 5 weeks, ReDi every 6 days. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | GRBASZero | ReDi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (281 ratings)](https://appshunter.io/ios/app/redi/id1506576790/reviews)** |
| Number of ratings | — | **281** |
| Positive reviews | 0.0% of reviews | **57.1% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 6 days** |
| Monetization | Free | Free |
| Size | 30 MB | 85 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [ENTZERO, LIMITED LIABILITY CO.](https://appshunter.io/developer/1719962125) | [MED-EL](https://appshunter.io/developer/455935145) |

## What reviewers say

### GRBASZero

[App page](https://appshunter.io/ios/app/grbaszero/id1490666100)

This app analyzes voice data to estimate hoarseness based on the GRBAS scale. It utilizes a machine learning model built from data collected at a hospital's otolaryngology department. The app focuses on evaluating the long vowel sound "A".

**Highlights:** Voice data analysis, GRBAS scale estimation, Machine learning model, Hoarseness evaluation, Long vowel sound analysis

**In-app purchases:** none


### ReDi

[App page](https://appshunter.io/ios/app/redi/id1506576790)

This app helps users of hearing technology practice auditory and speech skills independently. It offers structured exercises with immediate feedback, suitable for various difficulty levels and available on mobile devices.

**Highlights:** Auditory and speech practice, Independent user exercises, Real-time feedback, Multiple difficulty levels, Suitable for hearing aid/implant users

**In-app purchases:** none


## Frequently asked questions

### Is GRBASZero free?

GRBASZero is free to download, with no in-app purchases.

### Is ReDi free?

ReDi is free to download, with no in-app purchases.

### Do GRBASZero or ReDi have ads?

Neither GRBASZero nor ReDi shows ads.

### Which is updated more often, GRBASZero or ReDi?

GRBASZero ships an update every 5 weeks, and ReDi every 6 days. Most recently, GRBASZero was updated on October 6, 2026 and ReDi on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*