GRBASZero vs ReDi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GRBASZero
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".
- Voice data analysis
- GRBAS scale estimation
- Machine learning model
- Hoarseness evaluation
- Long vowel sound analysis
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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.
ReDi
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.
- Auditory and speech practice
- Independent user exercises
- Real-time feedback
- Multiple difficulty levels
- Suitable for hearing aid/implant users
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ReDi is an easy-to-use rehabilitation app designed to assist users of hearing technology to practice their auditory and speech skills. The exercises can be performed independently by the user. This app is logically structured, offers different levels of difficulty, and provides immediate feedback. ReDi works whenever and wherever you wish on your mobile device. - Scaffolds through different auditory and speech practice levels. - Listening and speech feedback in real time. - Ideal for individuals who don't have practice partners. - Suitable for users of hearing implants and hearing aids. - Founded in clinical practice. - Recommended for older children, teenagers, and adults. - ReDi is continuously developed and optimized. - Platform based, therefore always available. Get ready to practice with ReDi!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | GRBASZero | ReDi |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (281 ratings) — better |
| Positive reviews | 0.0% of reviews | 57.1% of reviews — better |
| Number of ratings | — | 281 — better |
| Update frequency | Every 5 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 30 MB | 85 MB |
| Age rating | 12+ | 4+ |
| Developer | ENTZERO, LIMITED LIABILITY CO. | MED-EL |
Customer experience
GRBASZero
ReDi
In-app purchases
GRBASZero
No in-app purchases
ReDi
No in-app purchases
