# BiLibre DjVu and PDF Reader vs Learn Kotlin Programming

The clearest difference is update cadence: BiLibre DjVu and PDF Reader at every 10 days against Learn Kotlin Programming's every 20 months. BiLibre DjVu and PDF Reader also leads on iOS requirement (10.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

BiLibre DjVu and PDF Reader costs $1.99 and Learn Kotlin Programming $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BiLibre DjVu and PDF Reader ships an update every 10 days, Learn Kotlin Programming every 20 months. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | BiLibre DjVu and PDF Reader | Learn Kotlin Programming |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | **[4.3 (103 ratings)](https://appshunter.io/ios/app/bilibre-djvu-and-pdf-reader/id1230039040/reviews)** | — |
| Number of ratings | **103** | — |
| Positive reviews | 41.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 20 months |
| Monetization | Paid | — |
| Size | 57 MB | 63 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Konstantin Bukreev](https://appshunter.io/developer/547576207) | [Muhammad Mubeen](https://appshunter.io/developer/1553722821) |

## What reviewers say

### BiLibre DjVu and PDF Reader

[App page](https://appshunter.io/ios/app/bilibre-djvu-and-pdf-reader/id1230039040)

Read and organize technical, scientific, and educational literature in DjVu and PDF formats. Features include customizable reading modes, powerful annotation tools, a built-in summary editor, and advanced DjVu processing. Manage your library with smart cataloging and metadata editing.

**Highlights:** Customizable reading modes, Annotation and drawing tools, Summary editor with Markdown, DjVu text recognition, Full text searching, Library cataloging and metadata editing, Cloud synchronization

**Features:** macOS Compatibility

**In-app purchases:** none


### Learn Kotlin Programming

[App page](https://appshunter.io/ios/app/learn-kotlin-programming/id6738941053)

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

**In-app purchases:** none


## Frequently asked questions

### Is BiLibre DjVu and PDF Reader free?

BiLibre DjVu and PDF Reader costs $1.99, with no in-app purchases.

### Is Learn Kotlin Programming free?

Learn Kotlin Programming costs $1.99, with no in-app purchases.

### Do BiLibre DjVu and PDF Reader or Learn Kotlin Programming have ads?

Neither BiLibre DjVu and PDF Reader nor Learn Kotlin Programming shows ads.

### Which is updated more often, BiLibre DjVu and PDF Reader or Learn Kotlin Programming?

BiLibre DjVu and PDF Reader ships an update every 10 days, and Learn Kotlin Programming every 20 months. Most recently, BiLibre DjVu and PDF Reader was updated on October 15, 2026 and Learn Kotlin Programming on October 17, 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.*