# Flightbook vs dou

The clearest difference is in-app purchases: Flightbook at none against dou's 2. Flightbook also leads on iOS requirement (15.0 vs 17.6). dou's advantage is update cadence (weekly vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. dou sells 2 in-app purchases, starting at $3.99 per month. Flightbook asks for nothing beyond the download.

Flightbook ships an update every 5 weeks, dou weekly. The most recent releases landed on October 3, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Flightbook | dou |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Size | 15 MB | 139 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Yannick Lagger](https://appshunter.io/developer/1046316230) | [THIBAULT MATHIEU DOUX](https://appshunter.io/developer/1817003827) |

## What reviewers say

### Flightbook

[App page](https://appshunter.io/ios/app/flightbook/id1046316231)

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

**In-app purchases:** none


### dou

[App page](https://appshunter.io/ios/app/dou/id6746456161)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dou Plus | $3.99 | per month |
| Dou Plus | $34.99 | per year |


## Frequently asked questions

### Is Flightbook free?

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

### Is dou free?

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

### Do Flightbook or dou have ads?

Neither Flightbook nor dou shows ads.

### Which is updated more often, Flightbook or dou?

Flightbook ships an update every 5 weeks, and dou weekly. Most recently, Flightbook was updated on October 3, 2026 and dou on September 24, 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.*