# Calvin Opera vs Reformed Reader Plus

The clearest difference is price: Reformed Reader Plus at Free against Calvin Opera's $4.99. Reformed Reader Plus also leads on rating (5.0 vs 1.0) and update cadence (every 4 months vs every 9 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Reformed Reader Plus is free to download; Calvin Opera costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Reformed Reader Plus holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Calvin Opera ships an update every 9 months, Reformed Reader Plus every 4 months. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Calvin Opera | Reformed Reader Plus |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/calvin-opera/id1042943229/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reformed-reader-plus/id6511201071/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Paid | **Free** |
| Size | 1.6 GB | 32 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [jeong youngoh](https://appshunter.io/developer/429170564) | [Kenneth Brown](https://appshunter.io/developer/1755460753) |

## What reviewers say

### Calvin Opera

[App page](https://appshunter.io/ios/app/calvin-opera/id1042943229)

Access the complete writings of John Calvin with fast search capabilities and an integrated Latin dictionary. This comprehensive collection is a primary resource for studying Calvin's extensive theological works.

**Highlights:** Complete Works of John Calvin, Fast search functionality, Integrated Latin dictionary, Primary source for Calvin studies, Organized by volume and content type

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

**In-app purchases:** none


### Reformed Reader Plus

[App page](https://appshunter.io/ios/app/reformed-reader-plus/id6511201071)

Explore the core tenets of Reformed theology with a curated library of confessions and catechisms. Features include easy navigation, scripture proofs, memory functions, and advanced search capabilities for in-depth study.

**Highlights:** Curated Reformed confessions and catechisms, Easy navigation and intuitive interface, Scripture proofs for theological doctrines, Memory features for saving favorite sections, Advanced search for themes and doctrines

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

**In-app purchases:** none


## Frequently asked questions

### Is Calvin Opera free?

Calvin Opera costs $4.99, with no in-app purchases.

### Is Reformed Reader Plus free?

Reformed Reader Plus is free to download, with no in-app purchases.

### Which has better reviews, Calvin Opera or Reformed Reader Plus?

Reformed Reader Plus is rated higher. Calvin Opera averages 1.0 out of 5 from 1 ratings, while Reformed Reader Plus averages 5.0 from 1 ratings.

### Do Calvin Opera or Reformed Reader Plus have ads?

Neither Calvin Opera nor Reformed Reader Plus shows ads.

### Which is updated more often, Calvin Opera or Reformed Reader Plus?

Calvin Opera ships an update every 9 months, and Reformed Reader Plus every 4 months. Most recently, Calvin Opera was updated on November 6, 2026 and Reformed Reader Plus on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*