# DuoBook.co vs Mirror Reader

The clearest difference is iOS requirement: DuoBook.co at 16.0 against Mirror Reader's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DuoBook.co sells 1 in-app purchase, starting at $7.99 per month and Mirror Reader sells 2 in-app purchases, starting at $5.99 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 19, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | DuoBook.co | Mirror Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mirror-reader/id6773104055/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | — | Freemium |
| Size | 33 MB | 34 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [Emin Onur Karakaslar](https://appshunter.io/developer/1891281160) | [VALENTYN VATSEK](https://appshunter.io/developer/6773104058) |

## What reviewers say

### 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 |


### Mirror Reader

[App page](https://appshunter.io/ios/app/mirror-reader/id6773104055)

This app offers a bilingual reading experience with side-by-side translations of real books. It includes features like instant word lookup, vocabulary saving, bookmarks, and audio playback to aid language learners.

**Highlights:** Parallel translations, Instant word lookup, Save vocabulary, Bookmarks and progress tracking, Audio playback, Cloud synchronization

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Books | $5.99 | per month |
| Premium Books | $39.99 | per year |


## Frequently asked questions

### Is DuoBook.co free?

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

### Is Mirror Reader free?

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

### Do DuoBook.co or Mirror Reader have ads?

Neither DuoBook.co nor Mirror Reader shows ads.

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

DuoBook.co ships an update every 4 days, and Mirror Reader every 4 days. Most recently, DuoBook.co was updated on September 19, 2026 and Mirror Reader on September 1, 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.*