# CPI Digital vs Castle eReader

CPI Digital and Castle eReader are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | CPI Digital | Castle eReader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cpi-digital/id1528042593/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | — |
| Size | 148 MB | 91 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Childrens Plus Inc.](https://appshunter.io/developer/1528042595) | [Castle Publications, LLC](https://appshunter.io/developer/1663236632) |

## What reviewers say

### CPI Digital

[App page](https://appshunter.io/ios/app/cpi-digital/id1528042593)

Access a wide range of eBooks from leading publishers directly on your device. This platform provides instant access to a curated collection of educational titles.

**Highlights:** All-access eBook platform, Instant access to titles, Content from top publishers, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Castle eReader

[App page](https://appshunter.io/ios/app/castle-ereader/id6446026046)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CPI Digital free?

CPI Digital is free to download, with no in-app purchases.

### Is Castle eReader free?

Castle eReader is free to download, with no in-app purchases.

### Do CPI Digital or Castle eReader have ads?

Neither CPI Digital nor Castle eReader 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.*