CCCSeries2 Catechism vs Calvin Opera
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CCCSeries2 Catechism
Access the complete Catechism of the Catholic Church and all Vatican II documents directly from the Vatican website. This reference tool is organized for easy navigation through its four main sections: Beliefs, Sacraments, Morality, and Prayer.
- Complete Catechism of the Catholic Church
- All Vatican II documents
- Direct Vatican website links
- Organized by topic
- Smooth navigation
- Summary of Second Vatican Council
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The Ultimate Catholic Reference Guide Deepen your faith and study with the absolute gold standard of Catholic teaching. The CCCSeries App brings you the ENTIRE Catechism of the Catholic Church and ALL 16 Vatican II documents, streaming instantly and securely directly from the official Vatican website. As St. John Paul II declared, the Catechism is "a sure and authentic reference text for teaching Catholic doctrine." This app is your gateway to that truth. Why This Is the BEST Reference Tool Available: 100% Authentic Sourcing: Every text connects directly to the Vatican website inside the app, ensuring absolute fidelity to the Magisterium while strictly adhering to USCCB copyright laws. All-In-One Library: Access the complete Catechism, all 16 Vatican II documents, plus an exclusive summary explaining the Council’s purpose, history, and real-world implementation. Flawless Navigation: Experience a beautiful, smooth, and highly intuitive user interface designed for effortless study, reading, and contemplation. Perfect for Everyone: An essential companion for home-schoolers, Catechists, CCE teachers, college students, seminarians, and anyone seeking theological truth at their fingertips. Perfectly Organized for Seamless Study: The Catechism: Divided into the four pillars of faith—Beliefs, Sacraments, Morality, and Prayer—and meticulously sub-categorized by topic. Vatican II Documents: Cleanly grouped into the Council's official Constitutions, Declarations, and Decrees for rapid reference. Important Usage Notes: Internet Connection Required: To comply with Holy See copyright guidelines and keep text verification authentic, a Wi-Fi or cellular internet connection is required to open the Vatican links. Academic Use: Exemptions apply for academic discourse (dissertations, scholarly articles, and course materials) provided all citations are properly acknowledged.
Calvin Opera
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.
- Complete Works of John Calvin
- Fast search functionality
- Integrated Latin dictionary
- Primary source for Calvin studies
- Organized by volume and content type
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The ‘Complete Works of Calvin’ refers to ‘Ioannis Calvini opera quae supersunt omnia’ (‘All Surviving Works of John Calvin’), which were edited between 1863 and 1900 by Johann Wilhelm Baum, August Eduard Cunitz and Eduard Reuss, and were published in 59 volumes. As the title indicates, it is a collection of all the writings of Calvin which had survived up to that time. The ‘Complete Works of Calvin’ is commonly abbreviated to ‘CO’(Calvini Opera), but is also abbreviated to ‘CR’ because it forms vols. 29-87 of the ‘Corpus Reformatorum,’ which also includes the works of Reformers Philip Melanchthon and Huldrich Zwingli. Thus, the first volume of the ‘Complete Works of Calvin’ can be referred to as ‘CO 1’ or ‘CR 29.’ The ‘Complete Works of Calvin’ remains the best primary source for the study of Calvin. Since 1992, critical editions of Calvin’s works have been published, starting with ‘Opera Exegetica: Commentarii in Pauli Epistolas ad Galatas, ad Ephesios, ad Philippenses, ad Colossenses,’ ed. Helmut Feld (Geneva: Librairie Droz, 1992). This task is being undertaken by an international committee of members of the finest quality, affiliated with the International Congress on Calvin Research. The contents of the ‘Complete Works of Calvin’ are as follows: Vols. 1-4 contain the Institutes of the Christian Religion, Vols. 5-9 mainly short treatises, 10-20 Epistles, 21 the lives of Calvin, 22 the indices of vols. 1-21, 23-44 Old Testament commentaries and sermons, 45-55 New Testament commentaries and sermons, 56-57 Calvin’s French Bible, 58-9 additional sermons and indices to vols. 23-55. This App enables fast searches of the ‘Complete Works of Calvin’ and contains an easy-to-use Latin dictionary. This is the combined works of two organizations, PartPrime and KIRS(Korean Institute for Reformed Studies).
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Verdict
The clearest difference is price: CCCSeries2 Catechism at $1.99 against Calvin Opera's $15.99. CCCSeries2 Catechism also leads on rating (2.3 vs 1.0) and ratings volume (7 vs 1). On update cadence, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
CCCSeries2 Catechism costs $1.99 and Calvin Opera $15.99 up front. Neither carries in-app purchases, so what you see is what you pay.
CCCSeries2 Catechism holds the better App Store score, 2.3 against 1.0. That said, the two scores are not equally well evidenced: CCCSeries2 Catechism has 7 ratings behind it against 1, so its average is the more settled of the two.
CCCSeries2 Catechism ships an update every 5 months, Calvin Opera every 9 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.
| Parameter | CCCSeries2 Catechism | Calvin Opera |
|---|---|---|
| Price | $1.99 — better | $15.99 |
| Rating | 2.3 (7 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 16.7% of reviews | — |
| Number of ratings | 7 — better | 1 |
| Update frequency | Every 5 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 1.6 GB |
| Age rating | 4+ | 4+ |
| Developer | Bil Kimes | jeong youngoh |
Customer experience
CCCSeries2 Catechism
Calvin Opera
In-app purchases
CCCSeries2 Catechism
No in-app purchases
Calvin Opera
No in-app purchases
Questions
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