# Passage vs DuoBook.co

The clearest difference is ads: DuoBook.co at none against Passage's shown. DuoBook.co also leads on iOS requirement (16.0 vs 26.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Passage sells 2 in-app purchases, starting at $8.99 per month and DuoBook.co sells 1 in-app purchase, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on September 11, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Passage | DuoBook.co |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | Every 4 days |
| Size | 33 MB | 33 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Huseyin Ugur Genc](https://appshunter.io/developer/1848540433) | [Emin Onur Karakaslar](https://appshunter.io/developer/1891281160) |

## What reviewers say

### Passage

[App page](https://appshunter.io/ios/app/passage-learn-languages/id6761542302)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $8.99 | per month |
| Yearly | $79.99 | per year |


### DuoBook.co

[App page](https://appshunter.io/ios/app/duobookco/id6762019079)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuoBook Pro | $7.99 | per month |


## Frequently asked questions

### Is Passage free?

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

### Is DuoBook.co free?

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

### Do Passage or DuoBook.co have ads?

Passage shows ads; DuoBook.co does not.

### Which is updated more often, Passage or DuoBook.co?

Passage ships an update every 4 days, and DuoBook.co every 4 days. Most recently, Passage was updated on September 11, 2026 and DuoBook.co on September 19, 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.*