# RadSounds Cause/Effect Lite vs ERSB Lite

The clearest difference is rating: RadSounds Cause/Effect Lite at 5.0 against ERSB Lite's 4.0. RadSounds Cause/Effect Lite also leads on monetization model (free vs free with in-app purchases) and iOS requirement (8.0 vs 13.0). ERSB Lite's advantage is update cadence (every 2 months vs every 11 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. RadSounds Cause/Effect Lite sells 1 one-off in-app purchase and ERSB Lite sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

RadSounds Cause/Effect Lite holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

RadSounds Cause/Effect Lite ships an update every 11 months, ERSB Lite every 2 months. The most recent releases landed on October 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | RadSounds Cause/Effect Lite | ERSB Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/radsounds-causeeffect-lite/id521282295/reviews)** | [4.0 (3 ratings)](https://appshunter.io/ios/app/ersb-lite/id976322567/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 114 MB | 253 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [RJ Cooper & Associates, Inc.](https://appshunter.io/developer/412790299) | [Attainment Company](https://appshunter.io/developer/403989333) |

## What reviewers say

### RadSounds Cause/Effect Lite

[App page](https://appshunter.io/ios/app/radsounds-causeeffect-lite/id521282295)

This educational app allows users to create custom music playlists by recording, importing, or using provided songs. It offers various playback modes, including momentary, timed, and playlist cycling, and is switch-friendly for users with physical challenges.

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

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RadSounds Full Upgrade | $4.99 | one-time |


### ERSB Lite

[App page](https://appshunter.io/ios/app/ersb-lite/id976322567)

This app builds early reading skills for students progressing from foundational literacy. It uses systematic instruction and assessments to help individuals read independently, proving effective for those with intellectual disabilities and autism.

**Highlights:** Early literacy skill development, Systematic instruction, Ongoing assessments, Progress to 2nd-grade reading level, Effective for intellectual disabilities, Effective for autism

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Levels 12-16 | $29.99 | one-time |
| Levels 17-21 | $29.99 | one-time |
| Levels 22-26 | $29.99 | one-time |
| Levels 2-6 | $29.99 | one-time |
| Levels 7-11 | $29.99 | one-time |


## Frequently asked questions

### Is RadSounds Cause/Effect Lite free?

RadSounds Cause/Effect Lite is free to download, with in-app purchases available.

### Is ERSB Lite free?

ERSB Lite is free to download, with in-app purchases available.

### Which has better reviews, RadSounds Cause/Effect Lite or ERSB Lite?

RadSounds Cause/Effect Lite is rated higher. RadSounds Cause/Effect Lite averages 5.0 out of 5 from 2 ratings, while ERSB Lite averages 4.0 from 3 ratings.

### Do RadSounds Cause/Effect Lite or ERSB Lite have ads?

Neither RadSounds Cause/Effect Lite nor ERSB Lite shows ads.

### Which is updated more often, RadSounds Cause/Effect Lite or ERSB Lite?

RadSounds Cause/Effect Lite ships an update every 11 months, and ERSB Lite every 2 months. Most recently, RadSounds Cause/Effect Lite was updated on October 29, 2026 and ERSB Lite on October 6, 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.*