Comparison

Thorium Reader vs 40

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

Head to head
About

Thorium Reader

Organize all your ebooks, comics, and manga in a single app. Customize your reading experience with adjustable text, fonts, and themes. Listen to audiobooks and zoom into visual content with ease.

Highlights
  • Unified bookshelf for all content
  • Adjustable text size and spacing
  • Multiple font options
  • Text-to-speech audio playback
  • Zoom for comics and manga
  • Offline dictionary and translation
  • Import EPUB, PDF, CBZ files
Features
Read full description

Looking for an app where you can bring all your ebooks, comics and manga in one place? That’s what we built Thorium Reader for. Read it your way Everyone’s different, that’s why we want you to be fully in control: • Adjust text size, switch between color schemes with themes and control spacing. • 10+ fonts available, including specialized ones. • You prefer audio? Listen to any ebook, whenever you want. We’ll remember your preference. • Zoom into comics, manga and magazines. • Add bookmarks with notes. • Use the built-in iOS dictionary and translation features, even offline. • Tweak your reading experience with reading options. Bring your own books A single bookshelf and reading application where you can bring all your content: • Download free books, borrow from your library or buy from your favorite retailer. • Support for ebooks, documents, comics and manga. • Import EPUB, PDF and CBZ files. • Support for Readium LCP, used by thousands of libraries and retailers. Thorium Reader is built by EDRLab, a non-profit dedicated to open standards, reading and accessibility.

About

40

This app provides a structured, year-long program for intentional discipleship between Christian followers. It includes daily devotionals, reflection questions, a prayer journal, and scripture study tools to foster spiritual growth and equip users to make disciples.

Highlights
  • Year-long discipleship program
  • Daily devotional readings
  • Reflection and discussion questions
  • Digital prayer journal
  • Scripture study with CAMP Method
  • Equips users to make disciples
Features
Currently charting
Read full description

If you decided to seriously invest time and energy in helping someone become a committed disciple of Christ, would you know what to do or where to start? Dr. D.J. Horton has created a tool to help you! 40 is a one-of-a-kind app designed to be used between Christ-followers in an intentional discipleship relationship for approximately one year. This app contains the full content of D.J.’s two-part book, 40, and allows you to reuse the app as you continue discipling others. With daily devotional readings, reflection and discussion questions, a digital prayer journal, and Scripture to study using the CAMP Method created by D.J., this app will help you become a more devoted disciple of Jesus and a disciple maker for Jesus.

Screenshots

Thorium Reader4 screens
404 screens

Verdict

The call

The clearest difference is price: Thorium Reader at Free against 40's $19.99. Thorium Reader also leads on update cadence (every 3 weeks vs every 3 months) and ratings volume (11 vs 1). 40's advantage is rating (5.0 vs 3.6) and chart position (#122 vs unranked). On 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

Thorium Reader is free to download; 40 costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

40 holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: Thorium Reader has 11 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Thorium Reader ships an update every 3 weeks, 40 every 3 months. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

Scorecard7 real differences · 4 level
Thorium Reader versus 40: the parameters behind the verdict, then further details
ParameterThorium Reader40
PriceFree — better$19.99
Rating3.6 (11 ratings)5.0 (1 ratings) — better
Positive reviews37.5% of reviews—
Number of ratings11 — better1
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank—#122 — better
DevicesiPhone, iPad — betteriPhone
Requires iOS26.116.0 — better
Further details — not scored
Size46 MB4 MB
Age rating17+4+
DeveloperReadiumLiving Worthy Ministries, LLC

Customer experience

Thorium Reader

All ratings11 ratings
Positive63.6%
Neutral9.1%
Negative27.3%
Written reviews8 reviews
Positive37.5%
Neutral12.5%
Negative50.0%

40

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Thorium Reader

No in-app purchases

None

40

No in-app purchases

Questions

Is Thorium Reader free?
Thorium Reader is free to download, with no in-app purchases.
Is 40 free?
40 costs $19.99, with no in-app purchases.
Which has better reviews, Thorium Reader or 40?
40 is rated higher. Thorium Reader averages 3.6 out of 5 from 11 ratings, while 40 averages 5.0 from 1 ratings.
Do Thorium Reader or 40 have ads?
Neither Thorium Reader nor 40 shows ads.
Which is updated more often, Thorium Reader or 40?
Thorium Reader ships an update every 3 weeks, and 40 every 3 months. Most recently, Thorium Reader was updated on October 13, 2026 and 40 on October 9, 2026.

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