Comparison

Thorium Reader vs RADIX

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

RADIX

This app offers a contemplative system based on philosophical concepts, featuring original artworks and internal voices. It encourages users to observe their reactions and discover hidden elements over time, with a focus on slow unfolding rather than quick consumption.

Highlights
  • 54 original artworks
  • 6 internal voices
  • Seasonal structure
  • Hidden systems
  • Contemplative practice
  • No notifications or streaks
Read full description

RADIX: The Practice is the official companion to the book RADIX: The Law of Redirected Motivation—a philosophical framework that examines why optimization fails, how attention degrades under pressure, and what it means to rebuild from depth rather than speed.
 RADIX: The Practice is a contemplative system built from 54 original works of art, designed to be encountered over time. The experience moves with the seasons. Some reflections return familiar ground. Others introduce entirely new forms—novel encounters that behave differently, surface unexpected perspectives, or quietly alter how the system responds.
 You draw reflections when something tightens. Or loosens.
Up to three times per day. Then the experiences rests. No notifications.
 No streaks.
 No habit loops.
 No algorithm learning you.
 Every reflection is a commissioned artwork—composed, rendered, and integrated as a structural element of the practice.  These are not prompts or affirmations. You are not asked to interpret, explain, or improve anything. Notice what reacts. That’s enough.
 Beneath the visible layer are hidden architectures. Five internal voices emerge gradually—not through achievement or completion, but through continued presence. Each carries a distinct way of seeing. A sixth—The Mirror—remains concealed longer and reflects what the others cannot.
 There are secrets embedded throughout the system. Some reveal themselves once and never return. Others remain dormant for months. Nothing announces itself. Discovery happens quietly, on its own terms.
 Everything you encounter carries weight. Reflections drawn. Voices met. Covenants held.  The system remembers without narrating. Hold too much for too long and the practice shifts. Composting is how you release—returning what is complete back into the soil. From what you let go, a Garden grows. Clear enough space, and emergence becomes possible.
 Time is part of the design. Some mechanics surface only after seasons have passed. 
RADIX is not meant to be consumed quickly or finished. It unfolds slowly—just as you do.
 Fifty-four original artworks.
 Six internal voices. 
Seasonal structure.
 Hidden systems.
 No subscriptions.  No ads.  No data extraction. Nothing sold but the practice itself.

Screenshots

Thorium Reader4 screens
RADIX4 screens

Verdict

The call

The clearest difference is review sentiment: RADIX at 100% against Thorium Reader's 38%. RADIX also leads on rating (5.0 vs 3.6) and update cadence (every 3 days vs every 3 weeks). Thorium Reader's advantage is price (Free vs $4.99) and ratings volume (11 vs 2). 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; RADIX costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RADIX 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 2, so its average is the more settled of the two. Written reviews point the same way: 38% of Thorium Reader's written reviews are positive against 100% of RADIX's.

UpkeepUpdate frequency

Thorium Reader ships an update every 3 weeks, RADIX every 3 days. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

Scorecard7 real differences · 3 level
Thorium Reader versus RADIX: the parameters behind the verdict, then further details
ParameterThorium ReaderRADIX
PriceFree — better$4.99
Rating3.6 (11 ratings)5.0 (2 ratings) — better
Positive reviews37.5% of reviews100.0% of reviews — better
Number of ratings11 — better2
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.115.1 — better
Further details — not scored
Size46 MB99 MB
Age rating17+4+
DeveloperReadiumAlexander Perrin

Customer experience

Thorium Reader

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

RADIX

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Thorium Reader

No in-app purchases

None

RADIX

No in-app purchases

Questions

Is Thorium Reader free?
Thorium Reader is free to download, with no in-app purchases.
Is RADIX free?
RADIX costs $4.99, with no in-app purchases.
Which has better reviews, Thorium Reader or RADIX?
RADIX is rated higher. Thorium Reader averages 3.6 out of 5 from 11 ratings, while RADIX averages 5.0 from 2 ratings.
Do Thorium Reader or RADIX have ads?
Neither Thorium Reader nor RADIX shows ads.
Which is updated more often, Thorium Reader or RADIX?
Thorium Reader ships an update every 3 weeks, and RADIX every 3 days. Most recently, Thorium Reader was updated on October 13, 2026 and RADIX on October 1, 2026.

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