# Deen Guide vs Brain Preflight

The clearest difference is in-app purchases: Deen Guide at none against Brain Preflight's 2. Deen Guide also leads on ads (none vs shown). Brain Preflight's advantage is update cadence (daily vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Brain Preflight sells 2 in-app purchases, starting at $6.99 per month. Deen Guide asks for nothing beyond the download.

Deen Guide ships an update monthly, Brain Preflight daily. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Deen Guide | Brain Preflight |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/brain-preflight/id6794363864/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Daily** |
| Monetization | — | Free with in-app purchases |
| Size | 48 MB | 13 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZERO HORIZON LTD](https://appshunter.io/developer/1879018583) | [Amine Kara](https://appshunter.io/developer/6794363986) |

## What reviewers say

### Deen Guide

[App page](https://appshunter.io/ios/app/deen-guide/id6759538369)

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

**In-app purchases:** none


### Brain Preflight

[App page](https://appshunter.io/ios/app/brain-preflight/id6794363864)

Engage in daily brain training with exercises mirroring pilot aptitude tests. Improve memory, logic, spatial reasoning, and multitasking skills. Prepare for aviation selections with tailored programs and mock exams.

**Highlights:** Pilot aptitude test exercises, Memory, logic, spatial, multitasking training, Tailored selection preparation programs, Full mock exams under real conditions, Cognitive diagnostic tools, 100% offline functionality, Aviation English and culture knowledge

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $6.99 | per month |
| Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is Deen Guide free?

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

### Is Brain Preflight free?

Brain Preflight is free to download, with in-app purchases available.

### Do Deen Guide or Brain Preflight have ads?

Brain Preflight shows ads; Deen Guide does not.

### Which is updated more often, Deen Guide or Brain Preflight?

Deen Guide ships an update monthly, and Brain Preflight daily. Most recently, Deen Guide was updated on October 4, 2026 and Brain Preflight 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.*