# BiLibre DjVu and PDF Reader vs Lambda calculus

The clearest difference is review sentiment: Lambda calculus at 100% against BiLibre DjVu and PDF Reader's 41%. Lambda calculus also leads on price (Free vs $1.99). BiLibre DjVu and PDF Reader's advantage is rating (4.3 vs 3.3) and ratings volume (103 vs 3). On ads, in-app purchases and device support there is nothing between them.

Lambda calculus is free to download; BiLibre DjVu and PDF Reader costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BiLibre DjVu and PDF Reader holds the better App Store score, 4.3 against 3.3. That said, the two scores are not equally well evidenced: BiLibre DjVu and PDF Reader has 103 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 41% of BiLibre DjVu and PDF Reader's written reviews are positive against 100% of Lambda calculus's, so the app with the better star average is not the one people write more warmly about.

## The numbers

| Metric | BiLibre DjVu and PDF Reader | Lambda calculus |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.3 (103 ratings)](https://appshunter.io/ios/app/bilibre-djvu-and-pdf-reader/id1230039040/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/lambda-calculus/id6737766234/reviews) |
| Number of ratings | **103** | 3 |
| Positive reviews | 41.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | — |
| Monetization | Paid | **Free** |
| Size | 57 MB | 5 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Konstantin Bukreev](https://appshunter.io/developer/547576207) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## 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


### Lambda calculus

[App page](https://appshunter.io/ios/app/lambda-calculus/id6737766234)

Learn the fundamentals of lambda calculus with this educational application. Gain a basic understanding of this important mathematical concept through an introductory experience.

**Highlights:** Introduction to lambda calculus, Basic understanding of concepts, Educational content

**Features:** macOS Compatibility

**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 Lambda calculus free?

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

### Which has better reviews, BiLibre DjVu and PDF Reader or Lambda calculus?

BiLibre DjVu and PDF Reader is rated higher. BiLibre DjVu and PDF Reader averages 4.3 out of 5 from 103 ratings, while Lambda calculus averages 3.3 from 3 ratings.

### Do BiLibre DjVu and PDF Reader or Lambda calculus have ads?

Neither BiLibre DjVu and PDF Reader nor Lambda calculus shows ads.

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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.*