# CalibReader vs purrpage. Double

The clearest difference is rating: purrpage. Double at 5.0 against CalibReader's 4.3. purrpage. Double also leads on in-app purchases (none vs 1) and iOS requirement (17.6 vs 26.2). CalibReader's advantage is ads (none vs shown) and chart position (#140 vs unranked). On price, review sentiment and device support there is nothing between them.

Both are free to download. CalibReader sells 1 one-off in-app purchase. purrpage. Double asks for nothing beyond the download.

purrpage. Double holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: CalibReader has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

CalibReader ships an update every 3 days, purrpage. Double every 6 days. Both last shipped on November 8, 2026.

## The numbers

| Metric | CalibReader | purrpage. Double |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/calibreader-epub-and-pdf-reader/id6777391511/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/purrpage-double-page-reader/id6815597778/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 6 days |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Best chart rank | **#140** | — |
| Size | 49 MB | 97 MB |
| Requires iOS | 26.2 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gram 1](https://appshunter.io/developer/1895687118) | [LeoStudio Global](https://appshunter.io/developer/1700204948) |

## What reviewers say

### CalibReader

[App page](https://appshunter.io/ios/app/calibreader-epub-and-pdf-reader/id6777391511)

**Currently charting:** #140 Top Free · Book (US App Store)

This app offers a reading experience for EPUB and PDF files, featuring dual-page spreads and realistic page curls. It integrates with your existing calibre library and supports various cloud storage options. Enjoy a customizable reading environment and seamless syncing across devices.

**Highlights:** Dual-page spread and page curl effect, Calibre library integration, Cloud storage support (iCloud, Dropbox, OneDrive), Cross-device reading position sync, Customizable themes and fonts, Built-in dictionary, PDF reader with two-page spreads

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Books Forever | $9.99 | one-time |


### purrpage. Double

[App page](https://appshunter.io/ios/app/purrpage-double-page-reader/id6815597778)

This app offers a serene reading experience for books, PDFs, and articles. It features customizable typography, a distraction-free interface, and a smart reading companion for explanations and summaries. Listen to your content with natural voices and follow along as sentences are highlighted.

**Highlights:** Customizable typography, Distraction-free reading, Organized library for books, PDFs, articles, AI reading companion for explanations and summaries, Text-to-speech with highlighting, Note-taking and highlighting, Two-page spread on compatible devices

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

**In-app purchases:** none


## Frequently asked questions

### Is CalibReader free?

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

### Is purrpage. Double free?

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

### Which has better reviews, CalibReader or purrpage. Double?

purrpage. Double is rated higher. CalibReader averages 4.3 out of 5 from 6 ratings, while purrpage. Double averages 5.0 from 1 ratings.

### Do CalibReader or purrpage. Double have ads?

purrpage. Double shows ads; CalibReader does not.

### Which is updated more often, CalibReader or purrpage. Double?

CalibReader ships an update every 3 days, and purrpage. Double every 6 days. Most recently, CalibReader was updated on November 8, 2026 and purrpage. Double on November 8, 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.*