Comparison

RadSounds Cause/Effect vs Avaz AAC

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RadSounds Cause/Effect

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
Read full description

RadSounds is the world's greatest cause/effect music program for special needs learners. You can customize your playlist by recording or singing new music to your iPad, importing from your iPad's music library, or use the many great songs that we provide, from many types. There is Momentary mode, where the music plays for only the time you hold your finger on the iPad, Timed mode, where the music plays for a specified number of seconds upon each activation, or an advanced mode where the user chooses songs by cycling through their playlist. RadSounds is *switch-friendly*, that is, for those with physical challenges, a switch (or button) can be plugged into our iPad Switch Interface for cordless access to switch-friendly apps.

About

Avaz AAC

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
Read full description

Avaz AAC is an assistive communication app that empowers children & adults with Autism, Cerebral Palsy, Down Syndrome, Aphasia, Apraxia, and individuals with speech difficulties to communicate freely and build meaningful relationships. “My daughter has nearly mastered navigation, so much so that one day she brought it to me to show me she wanted Taco Bell for lunch. This made me cry. My child had a voice for the first time. Thank you for being the one to give my daughter that "voice". - Amy Kinderman Designed to aid language development, by presenting core words, which make up 80% of everyday speech, in a research-based order. This enables users to progress from using 1-2 word phrases to forming complete sentences. Avaz, a fully AAC text-to-speech app with over 40,000 pictures(Symbolstix) and a range of high-quality voices, enables users to form sentences and express themselves with ease quickly. Avaz is a customizable AAC app that empowers users to express themselves authentically and build meaningful connections! Effortless Backup and Themes Enjoy the convenience of auto backup for worry-free vocabulary progress. Simply choose how often you want your vocabulary progress backed up with our auto-backup interval selection option. Never lose your progress again! We understand our users have different preferences for cloud storage, so we made it easy to back up your vocabulary to your preferred platform, including popular ones like Google Drive. Explore our visual themes - Classic Light, Classic Dark (with high contrast), and Outer Space (a dark mode). Our default dark mode has been beneficial for adult users and those using Avaz with eye-tracking devices. Try Avaz AAC's free 14-day trial without adding credit card details! Make in-app purchases and choose from our affordable monthly, yearly, and lifetime subscription plans to keep benefiting from the amazing features. Now available in English US, English UK, Français, Dansk, Svenska, Magyar, Føroyskt is fully compatible with iPads and iPhones. If you’re new to AAC, don’t worry! Visit www.avazapp.com for beginner-friendly articles to help you get started. Connect with our passionate Avaz community on Facebook and other social media platforms. We are always happy to hear from you. For any assistance, please write to us at support@avazapp.com Note: Avaz AAC - Lifetime Edition is available for a one-time purchase and offers a 50% discount with VPP for 20+ licenses. Terms of Use - https://www.avazapp.com/terms-of-use/ Privacy Policy - https://www.avazapp.com/privacy-policy/

Screenshots

Avaz AAC4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard9 real differences · 1 level
RadSounds Cause/Effect versus Avaz AAC: the parameters behind the verdict, then further details
ParameterRadSounds Cause/EffectAvaz AAC
Price$1.99Free — better
Rating4.5 (2 ratings) — better4.1 (316 ratings)
Positive reviews77.8% of reviews — better60.2% of reviews
Number of ratings2316 — better
Update frequencyEvery 11 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS9.0 — better14.0
Further details — not scored
Size121 MB169 MB
Age rating4+4+
DeveloperRJ Cooper & Associates, Inc.Avaz, Inc.

Customer experience

RadSounds Cause/Effect

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive77.8%
Neutral22.2%
Negative0.0%

Avaz AAC

All ratings316 ratings
Positive77.2%
Neutral7.9%
Negative14.9%
Written reviews93 reviews
Positive60.2%
Neutral12.9%
Negative26.9%

Bugs and requests

RadSounds Cause/Effect

Not enough reviews yet to summarise bugs or requests.

Avaz AAC

Reported bugs

11 issues
  • 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
Show 6 more
  • Backup import puts boards into single folder instead of original structure
  • Screen rotation issues with keyboard
  • App takes long time to load on tablets
  • Sentence word order incorrect with screen reader (words with icons read last)
  • Internet connection error during subscription
  • Slow customer support response times

Requested features

10 requests
  • 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
Show 5 more
  • Vertical orientation option for small hands
  • Extended gender identity options beyond binary
  • Automatic phrase copying without premium
  • Lifetime membership after extended subscription period
  • Picture upload and backup/restore functionality

In-app purchases

None

RadSounds Cause/Effect

No in-app purchases

4 purchases

Avaz AAC

Subscriptions2
  • Avaz Auto Renewing Subscription$9.991 Month
  • Avaz Yearly Subscription$99.991 Year
One-time2
  • Lifetime Subscription2 variants$199.99
  • Lifetime Subscription$299.99

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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