ReDi vs Sound Reflection
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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!
Sound Reflection
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“Reflection of Sound by EduTech Era” helps students understand one of the most important concepts in acoustics — how sound waves bounce off surfaces and form echoes. With clear visuals, real-life examples, and easy explanations, this app makes sound physics simple and engaging. Features: - Complete explanation of sound reflection - Real-life examples like echoes and sonar - High-quality diagrams with zoom and rotate - Interactive animations for better clarity - Simple, student-friendly language - Differences between reflection and absorption - Works fully offline - no internet required - Ideal for school students, teachers, and science learners Whether you're studying for exams or just curious about how sound behaves, this app offers an easy and visually rich way to learn all about the reflection of sound. Download now and explore how sound waves travel, reflect, and shape what we hear!
Screenshots
Verdict
The clearest difference is price: ReDi at Free against Sound Reflection's $1.99. ReDi also leads on update cadence (weekly vs every 42 months). Sound Reflection's advantage is iOS requirement (12.0 vs 15.6). On ads, in-app purchases and device support 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
ReDi is free to download; Sound Reflection costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ReDi ships an update weekly, Sound Reflection every 42 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.
| Parameter | ReDi | Sound Reflection |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.5 (311 ratings) — better | — |
| Positive reviews | 57.1% of reviews | — |
| Number of ratings | 311 — better | — |
| Update frequency | Weekly — better | Every 42 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 85 MB | 228 MB |
| Age rating | 4+ | 4+ |
| Developer | MED-EL Elektromedizinische Geraete GmbH | VIRTUAL FILAMENTS PRIVATE LIMITED |
In-app purchases
ReDi
No in-app purchases
Sound Reflection
No in-app purchases









