Comparison

Calvin Opera vs Pop Comm Bible Commentary

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Complete Works of John Calvin
  • Fast search functionality
  • Integrated Latin dictionary
  • Primary source for Calvin studies
  • Organized by volume and content type
Features
Read full description

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).

About

Pop Comm Bible Commentary

Access a comprehensive Bible commentary written from a Lutheran perspective. This app offers an insightful explanation of Scripture, referencing the King James Version (KJV). It provides an accessible resource for all Christians seeking to understand the Bible.

Highlights
  • Kretzmann's Popular Commentary text
  • Lutheran perspective
  • Accessible explanation of Scripture
  • King James Version (KJV) reference
  • Resource for Christians
Features
Read full description

The Pop Comm app contains the text of Dr. Paul E. Kretzmann‘s “The Popular Commentary of the Bible.” Written from a Lutheran perspective and completed in 1924, this commentary provides all Christians with an accessible and insightful explanation of Scripture. The Scripture referenced in this commentary is King James Version (KJV).

Screenshots

Calvin Opera3 screens
Pop Comm Bible Commentary4 screens

Verdict

The call

The clearest difference is price: Pop Comm Bible Commentary at Free against Calvin Opera's $4.99. Pop Comm Bible Commentary also leads on rating (4.8 vs 1.0) and update cadence (every 3 months vs every 9 months). On review sentiment, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Pop Comm Bible Commentary is free to download; Calvin Opera costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Pop Comm Bible Commentary holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Pop Comm Bible Commentary has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Calvin Opera ships an update every 9 months, Pop Comm Bible Commentary every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
Calvin Opera versus Pop Comm Bible Commentary: the parameters behind the verdict, then further details
ParameterCalvin OperaPop Comm Bible Commentary
Price$4.99Free — better
Rating1.0 (1 ratings)4.8 (16 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings116 — better
Update frequencyEvery 9 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.615.1 — better
Further details — not scored
Size1.6 GB50 MB
Age rating4+12+
Developerjeong youngohPearl Crescent

Customer experience

Calvin Opera

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Pop Comm Bible Commentary

All ratings16 ratings
Positive93.8%
Neutral0.0%
Negative6.3%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Calvin Opera

No in-app purchases

None

Pop Comm Bible Commentary

No in-app purchases

Questions

Is Calvin Opera free?
Calvin Opera costs $4.99, with no in-app purchases.
Is Pop Comm Bible Commentary free?
Pop Comm Bible Commentary is free to download, with no in-app purchases.
Which has better reviews, Calvin Opera or Pop Comm Bible Commentary?
Pop Comm Bible Commentary is rated higher. Calvin Opera averages 1.0 out of 5 from 1 ratings, while Pop Comm Bible Commentary averages 4.8 from 16 ratings.
Do Calvin Opera or Pop Comm Bible Commentary have ads?
Neither Calvin Opera nor Pop Comm Bible Commentary shows ads.
Which is updated more often, Calvin Opera or Pop Comm Bible Commentary?
Calvin Opera ships an update every 9 months, and Pop Comm Bible Commentary every 3 months. Most recently, Calvin Opera was updated on November 6, 2026 and Pop Comm Bible Commentary on November 3, 2026.

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