Calvin Opera vs 1650 Split Leaf Psalter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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).
1650 Split Leaf Psalter
Access the complete text and music of the 1650 Scottish Metrical Psalter. This digital edition integrates words and melodies, including tunes from the Free Church of Scotland (Continuing) Split Leaf Psalter, along with historical notes and prefaces.
- Complete text of 1650 Scottish Metrical Psalter
- Integrated words and music
- Tunes from Free Church of Scotland (Continuing) Split Leaf Psalter
- John Brown of Haddington's Notes
- Preface to the 1650 Psalter
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The Digital 1650 Psalter. This edition includes the ability to integrate the words and music together. Features: 1. The Complete Text of the 1650 Scottish Metrical Psalter. 2. All of the tunes in the Free Church of Scotland (Continuing) Split Leaf Psalter. 3. John Brown of Haddington's Notes. 4. Preface to the 1650 Psalter.
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Verdict
The clearest difference is price: 1650 Split Leaf Psalter at Free against Calvin Opera's $15.99. 1650 Split Leaf Psalter also leads on rating (4.9 vs 1.0) and update cadence (every 2 days vs every 9 months). On ads, in-app purchases, device support and iOS requirement 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
1650 Split Leaf Psalter is free to download; Calvin Opera costs $15.99 up front. Neither carries in-app purchases, so what you see is what you pay.
1650 Split Leaf Psalter holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: 1650 Split Leaf Psalter has 52 ratings behind it against 1, so its average is the more settled of the two.
Calvin Opera ships an update every 9 months, 1650 Split Leaf Psalter every 2 days. The most recent releases landed on October 7, 2026 and October 19, 2026 respectively.
| Parameter | Calvin Opera | 1650 Split Leaf Psalter |
|---|---|---|
| Price | $15.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.9 (52 ratings) — better |
| Positive reviews | — | 84.2% of reviews |
| Number of ratings | 1 | 52 — better |
| Update frequency | Every 9 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 1.6 GB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | jeong youngoh | Romesh Prakashpalan |
Customer experience
Calvin Opera
1650 Split Leaf Psalter
In-app purchases
Calvin Opera
No in-app purchases
1650 Split Leaf Psalter
No in-app purchases







