Comparison

UniBook vs Flumen

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

Head to head
About

UniBook

Features
Read full description

Tired of subscriptions? UniBook is a one-time-purchase reader for the EPUB, PDF, M4B, and MP3 files you own. Read and listen offline, keep your library organized, and pick up exactly where you left off. β€” WHY READERS CHOOSE UNIBOOK β€” PAY ONCE, READ FOR LIFE A single in-app purchase unlocks the full reader. No monthly plan and no automatic renewal. YOUR LIBRARY STAYS YOURS Import compatible DRM-free files through Files, iCloud Drive, or the Share extension. Your imported books remain on your device, UniBook does not upload your library, and no account is required. β€” FEATURES β€” EPUB READER β€’ Adjustable text size and reading themes β€’ Light, sepia, and dark reading themes β€’ Save highlights and quotes β€’ Share quotes as polished images β€’ Resume from your saved position β€’ See reading progress in the reader and your library PDF READER β€’ Native PDF viewing β€’ Page and progress tracking β€’ Saved position for reliable resume β€’ Progress visible alongside your other books AUDIOBOOK PLAYER β€’ M4B and MP3 audiobooks β€’ Single-file and multi-file books β€’ Playback speed from 0.5x to 2x β€’ Sleep timer β€’ Background playback and lock-screen controls β€’ Resume from your last position β€’ Chapter navigation LIBRARY MANAGEMENT β€’ Custom shelves and favorites β€’ Dedicated Reading and Finished shelves β€’ Active books stay easy to reach; completed books move to the end β€’ Import several compatible files from Files β€’ Add books and audiobooks from other apps with the Share extension β€’ Share or remove your own files at any time READING STATISTICS β€’ Daily reading and listening time β€’ Reading streaks and daily goals β€’ Yearly activity graph β€’ Year in Review SIRI β€’ Resume your last audiobook with the β€œPlay Last Audiobook” shortcut Supported formats: EPUB, PDF, M4B, MP3 UniBook is built for readers who manage their own digital library and want a focused, private reading experience without a recurring subscription. Note: UniBook is a reader app. It does not sell, distribute, or provide book content. You are responsible for ensuring that you have the right to use every file you import. DRM-protected files are not supported.

About

Flumen

Features
Read full description

Read your EPUB books on iPhone, iPad, and Mac with Flumen. Import your own files, browse classics, and keep your books together in one library. Organize your books Create collections, sort by title, author, or progress, and filter books by what you've started or finished. Bookmark the book you're reading to keep it at the top of Library and ready to open from Home. Return to your reading Home shows your current book, saved chapter, and reading progress, with a Continue Reading button to take you back. See how many minutes you've read today and return to other books you've started. Set up the page to suit you Choose a reading theme, font, and text size. Use Paper or Sepia for a warmer page, or switch to a dark theme. Flumen remembers your reading preferences for each book. Find something to read Browse genres and authors, search Project Gutenberg and Standard Ebooks, and download public-domain books straight to your library. Open a book's details to learn more before adding it. Flumen Pro The free version holds up to 15 books and includes EPUB import, Discovery, collections, reader customization, and today's reading time. Flumen Pro is a one-time purchase that adds: β€’ Unlimited books in your library. β€’ Reading goals, streaks, weekly charts, and monthly summaries, including a comparison with the same point last month. β€’ iCloud sync for your books, reading progress, collections, bookmarked book, and reader settings across your Apple devices. To sync, sign in to the same Apple Account with iCloud enabled on each device. Privacy Your library and reading history are stored on your device, with optional iCloud sync through Flumen Pro. Flumen has no ads or third-party analytics tracking.

Screenshots

UniBook4 screens
Flumen4 screens

Verdict

The call

The clearest difference is update cadence: Flumen at every 9 days against UniBook's every 3 weeks. Flumen also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. UniBook sells 1 one-off in-app purchase and Flumen sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

UniBook ships an update every 3 weeks, Flumen every 9 days. The most recent releases landed on October 25, 2026 and October 22, 2026 respectively.

Scorecard2 real differences Β· 4 level
UniBook versus Flumen: the parameters behind the verdict, then further details
ParameterUniBookFlumen
PriceFreeFree
Update frequencyEvery 3 weeksEvery 9 days β€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.017.0 β€” better
Further details β€” not scored
Size15 MB16 MB
Age rating+412+
DeveloperDenis TroninMathias Jaeger-Pedersen

In-app purchases

1 purchases

UniBook

One-time1
  • UniBook Premium$49.99
1 purchases

Flumen

One-time1
  • Flumen Pro$6.99

Questions

Is UniBook free?
UniBook is free to download, with in-app purchases available.
Is Flumen free?
Flumen is free to download, with in-app purchases available.
Do UniBook or Flumen have ads?
Neither UniBook nor Flumen shows ads.
Which is updated more often, UniBook or Flumen?
UniBook ships an update every 3 weeks, and Flumen every 9 days. Most recently, UniBook was updated on October 25, 2026 and Flumen on October 22, 2026.

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