# RadSounds Cause/Effect Lite vs TD CoPilot

The clearest difference is rating: RadSounds Cause/Effect Lite at 5.0 against TD CoPilot's 3.7. RadSounds Cause/Effect Lite also leads on iOS requirement (8.0 vs 15.0). TD CoPilot's advantage is in-app purchases (none vs 1) and update cadence (every 2 months vs every 11 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. RadSounds Cause/Effect Lite sells 1 one-off in-app purchase. TD CoPilot asks for nothing beyond the download.

RadSounds Cause/Effect Lite holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

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

## The numbers

| Metric | RadSounds Cause/Effect Lite | TD CoPilot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/radsounds-causeeffect-lite/id521282295/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/td-copilot/id1553068329/reviews) |
| Number of ratings | 2 | **3** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 114 MB | 57 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [RJ Cooper & Associates, Inc.](https://appshunter.io/developer/412790299) | [Tobii Dynavox LLC](https://appshunter.io/developer/446210474) |

## 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 |


### TD CoPilot

[App page](https://appshunter.io/ios/app/td-copilot/id1553068329)

This app calibrates eye tracking devices for optimal performance and user experience. It also provides access to device settings, firmware updates, and battery status information.

**Highlights:** Eye tracker calibration, Device settings customization, Firmware update tracking, Application version display, Battery status verification

**In-app purchases:** none


## Frequently asked questions

### Is RadSounds Cause/Effect Lite free?

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

### Is TD CoPilot free?

TD CoPilot is free to download, with no in-app purchases.

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

RadSounds Cause/Effect Lite is rated higher. RadSounds Cause/Effect Lite averages 5.0 out of 5 from 2 ratings, while TD CoPilot averages 3.7 from 3 ratings.

### Do RadSounds Cause/Effect Lite or TD CoPilot have ads?

Neither RadSounds Cause/Effect Lite nor TD CoPilot shows ads.

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

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