# FlashOne.ai vs Grey

The clearest difference is in-app purchases: Grey at none against FlashOne.ai's 4. Grey also leads on ads (none vs shown) and iOS requirement (15.0 vs 17). On price, update cadence and device support there is nothing between them.

Both are free to download. FlashOne.ai sells 4 in-app purchases, starting at $6.99 per month. Grey asks for nothing beyond the download.

FlashOne.ai ships an update every 3 weeks, Grey every 5 weeks. Both last shipped on October 7, 2026.

## The numbers

| Metric | FlashOne.ai | Grey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/grey-matter/id6793108037/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | — | Free |
| Size | 119 MB | 97 MB |
| Requires iOS | 17 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sunshine Whitton](https://appshunter.io/developer/1783671848) | [Saifuldeen Al-Bajjari](https://appshunter.io/developer/6776365056) |

## What reviewers say

### FlashOne.ai

[App page](https://appshunter.io/ios/app/flashoneai/id6739095638)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Access | $6.99 | per month |
| Monthly Pro Access | $9.99 | per month |
| Annual Premium Access | $45.99 | per year |
| Annual Pro Access | $75.99 | per year |


### Grey

[App page](https://appshunter.io/ios/app/grey-matter/id6793108037)

This platform helps medical students study efficiently with organized question banks and an intuitive interface. It offers theoretical and practical learning, smart exam modes, and detailed explanations to prepare students for exams. Track your progress and personalize your study experience for confident exam preparation.

**Highlights:** Comprehensive medical question banks, Theoretical and practical learning, Smart exam modes, Detailed explanations, Performance analytics, Personalized study experience, Cloud synchronization

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

**In-app purchases:** none


## Frequently asked questions

### Is FlashOne.ai free?

FlashOne.ai is free to download, with in-app purchases available.

### Is Grey free?

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

### Do FlashOne.ai or Grey have ads?

FlashOne.ai shows ads; Grey does not.

### Which is updated more often, FlashOne.ai or Grey?

FlashOne.ai ships an update every 3 weeks, and Grey every 5 weeks. Most recently, FlashOne.ai was updated on October 7, 2026 and Grey on October 7, 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.*