# Douay vs Open Polytechnic Library

The clearest difference is in-app purchases: Open Polytechnic Library at none against Douay's 1. Open Polytechnic Library also leads on ads (none vs shown). Douay's advantage is update cadence (every 10 months vs every 43 months) and iOS requirement (16.0 vs 26.0). On price and device support there is nothing between them.

Both are free to download. Douay sells 1 in-app purchase, starting at $2.99 per month. Open Polytechnic Library asks for nothing beyond the download.

Douay ships an update every 10 months, Open Polytechnic Library every 43 months. The most recent releases landed on October 29, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Douay | Open Polytechnic Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (658 ratings)](https://appshunter.io/ios/app/douay-rhiems-catholic-bible/id1215294455/reviews)** | — |
| Number of ratings | **658** | — |
| Positive reviews | 46.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 10 months** | Every 43 months |
| Monetization | Free with in-app purchases | — |
| Size | 95 MB | 43 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Dzianis Kaniushyk](https://appshunter.io/developer/1204880202) | [Stacks Inc.](https://appshunter.io/developer/1275752393) |

## What reviewers say

### Douay

[App page](https://appshunter.io/ios/app/douay-rhiems-catholic-bible/id1215294455)

Access the historic Douay-Rheims Catholic Bible translation, the first officially authorized Catholic Bible in English. This version includes the Deuterocanonical books and features historical context and scholarly notes.

**Highlights:** Douay-Rheims translation, Latin Vulgate basis, Deuterocanonical books included, Historical context, Explanatory notes, Challoner revision

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UPGRADE: NO ADS | $2.99 | per month |

**What reviewers like**

- 👍 Great app for reading the Bible
- 👍 Handy resource
- 👍 Exactly what it says it is (Douay Rheims Bible)
- 👍 Catholic version is traditional
- 👍 Excellent translation

**What reviewers complain about**

- 😞 Pornographic ads
- 😞 No chapters shown
- 😞 Only first chapter provided, rest requires purchase
- 😞 White text on light background (contrast issue)
- 😞 Ads can't be removed with one-time fee

**Reported bugs**

- Nasty pornographic ads popped up immediately
- Books with multiple chapters only shows 1 book
- Searches for 2nd-4th book doesn’t work
- No chapter numbers or tools on iPhone
- Can’t see the text due to low contrast

**Requested features**

- See the chapter at the top
- Make it easier to locate chapters
- Option to remove ads with a one-time fee


### Open Polytechnic Library

[App page](https://appshunter.io/ios/app/open-polytechnic-library/id6443709955)

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

**In-app purchases:** none


## Frequently asked questions

### Is Douay free?

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

### Is Open Polytechnic Library free?

Open Polytechnic Library is free to download, with no in-app purchases.

### Do Douay or Open Polytechnic Library have ads?

Douay shows ads; Open Polytechnic Library does not.

### Which is updated more often, Douay or Open Polytechnic Library?

Douay ships an update every 10 months, and Open Polytechnic Library every 43 months. Most recently, Douay was updated on October 29, 2026 and Open Polytechnic Library on October 16, 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.*