# RadSounds Cause/Effect vs Avaz AAC

The clearest difference is price: Avaz AAC at Free against RadSounds Cause/Effect's $1.99. Avaz AAC also leads on ratings volume (316 vs 2) and update cadence (every 4 months vs every 11 months). RadSounds Cause/Effect's advantage is in-app purchases (none vs 5) and rating (4.5 vs 4.1). On ads there is nothing between them.

Avaz AAC is free to download; RadSounds Cause/Effect costs $1.99 up front. Avaz AAC sells 4 in-app purchases, starting at $9.99 per month. RadSounds Cause/Effect asks for nothing beyond the download.

RadSounds Cause/Effect holds the better App Store score, 4.5 against 4.1. That said, the two scores are not equally well evidenced: Avaz AAC has 316 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 78% of RadSounds Cause/Effect's written reviews are positive against 60% of Avaz AAC's.

RadSounds Cause/Effect ships an update every 11 months, Avaz AAC every 4 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | RadSounds Cause/Effect | Avaz AAC |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/radsounds-causeeffect/id420977569/reviews)** | [4.1 (316 ratings)](https://appshunter.io/ios/app/avaz-aac/id909574843/reviews) |
| Number of ratings | 2 | **316** |
| Positive reviews | **77.8% of reviews** | 60.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 121 MB | 169 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [RJ Cooper & Associates, Inc.](https://appshunter.io/developer/412790299) | [Avaz, Inc.](https://appshunter.io/developer/904985795) |

## What reviewers say

### RadSounds Cause/Effect

[App page](https://appshunter.io/ios/app/radsounds-causeeffect/id420977569)

This music program allows users to create custom playlists by recording, importing, or using provided songs. It offers multiple playback modes and is switch-friendly for individuals with physical challenges.

**Highlights:** Customizable music playlists, Record or import audio, Momentary playback mode, Timed playback mode, Advanced playlist cycling, Switch-friendly access

**Features:** macOS Compatibility

**In-app purchases:** none


### Avaz AAC

[App page](https://appshunter.io/ios/app/avaz-aac/id909574843)

This app empowers individuals with speech difficulties to communicate freely. It aids language development by presenting core words and allows users to form sentences and express themselves with over 40,000 pictures and high-quality voices. Customizable themes and effortless backup options enhance the user experience.

**Highlights:** Symbol-based communication, Text-to-speech functionality, Customizable themes, Automatic vocabulary backup, Research-based language development, High-quality voices

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Avaz Auto Renewing Subscription | $9.99 | per month |
| Avaz Yearly Subscription | $99.99 | per year |
| Lifetime Subscription | $199.99 | one-time |
| Lifetime Subscription | $299.99 | one-time |

**What reviewers like**

- 👍 User-friendly interface and easy navigation
- 🎯 Highly customizable to individual needs
- 🗣️ Clear, natural-sounding voice options
- 💬 Effective communication tool for non-verbal users
- 🎨 Clear and intuitive icons

**What reviewers complain about**

- 💸 High subscription cost ($300 lifetime, $10+ monthly)
- ⏰ Short free trial period (14 days only)
- 🚫 Misleading free trial marketing
- 🔇 Voice feature disabled after trial ends
- 🐛 Frequent app crashes and freezing

**Reported bugs**

- App crashes when typing or entering letters
- Screen freezes when searching for pictures
- Voice functionality stops working randomly
- Audio not playing despite correct volume settings
- App loses voice after several uses

**Requested features**

- Free or significantly reduced pricing for disabled users
- Longer free trial period (20+ days suggested)
- Ability to save and reuse phrases
- Online two-way communication capability
- Video and user-created image support


## Frequently asked questions

### Is RadSounds Cause/Effect free?

RadSounds Cause/Effect costs $1.99, with no in-app purchases.

### Is Avaz AAC free?

Avaz AAC is free to download, with in-app purchases available.

### Which has better reviews, RadSounds Cause/Effect or Avaz AAC?

RadSounds Cause/Effect is rated higher. RadSounds Cause/Effect averages 4.5 out of 5 from 2 ratings, while Avaz AAC averages 4.1 from 316 ratings.

### Do RadSounds Cause/Effect or Avaz AAC have ads?

Neither RadSounds Cause/Effect nor Avaz AAC shows ads.

### Which is updated more often, RadSounds Cause/Effect or Avaz AAC?

RadSounds Cause/Effect ships an update every 11 months, and Avaz AAC every 4 months. Most recently, RadSounds Cause/Effect was updated on November 1, 2026 and Avaz AAC on November 1, 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.*