# Sleep Cue vs Grey Matters Brain Training

Sleep Cue and Grey Matters Brain Training are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Sleep Cue | Grey Matters Brain Training |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/sleep-cue/id1508045969/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | — |
| Size | 157 MB | 140 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Enchanted Wave LLC](https://appshunter.io/developer/1452734801) | [Grey Matters of Carmel LLC](https://appshunter.io/developer/1652054320) |

## What reviewers say

### Sleep Cue

[App page](https://appshunter.io/ios/app/sleep-cue/id1508045969)

This app serves as an interactive companion for a wireless brainwave headband. It displays real-time EEG signals and brainwave power spectrograms, enabling users to trigger custom cues based on sleep stages and brainwave activity for lucid dreaming.

**Highlights:** Real-time EEG signal viewing, Brainwave power spectrogram, Customizable cue triggering, Lucid dream induction techniques, Research collaboration opportunities

**Features:** macOS Compatibility

**In-app purchases:** none


### Grey Matters Brain Training

[App page](https://appshunter.io/ios/app/grey-matters-brain-training/id6547844625)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Sleep Cue free?

Sleep Cue is free to download, with no in-app purchases.

### Is Grey Matters Brain Training free?

Grey Matters Brain Training is free to download, with no in-app purchases.

### Do Sleep Cue or Grey Matters Brain Training have ads?

Neither Sleep Cue nor Grey Matters Brain Training shows ads.

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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.*