Comparison

BookLight vs ReadAI Smart

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

Head to head
About

BookLight

This app helps language learners build vocabulary by translating words with a single tap while reading EPUB, PDF, or TXT files. It automatically saves new words and uses spaced repetition flashcards to aid memorization, eliminating the need for manual flashcard creation or app switching.

Highlights
  • Tap to translate words instantly
  • Automatic vocabulary saving
  • Spaced-repetition flashcards
  • Import EPUB, PDF, TXT files
  • Offline reading support
  • Customizable reading themes and fonts
  • Pronunciation audio
Features
Read full description

Reading a book in another language? Stop breaking your flow to look words up. BookLight translates any word with a single tap β€” and remembers it for you. BookLight is a EPUB & PDF & Txt reader built for language learners. Tap a word for an instant translation, and it's saved to your vocabulary automatically. Then spaced-repetition flashcards bring it back right before you'd forget β€” so every reading session actually builds your vocabulary. No app-switching. No flashcards to make by hand. Perfect for language learners, foreign-book readers, and anyone studying for TOEFL or IELTS. Key Features: Start Reading in Seconds β€” Free Classics Inside - Download from various free classics (Project Gutenberg) right inside the app β€” no files to find, no setup. - Or import your own DRM-free EPUB & PDF & TXT files from your device. - Read offline anytime, with your reading progress saved and restored automatically. Tap to Translate β€” Without Losing Context - Tap any word for an instant translation: meaning by part of speech, phonetics, and an example sentence. - Tap an inflected word and see its base form, too. - Hear the pronunciation read aloud with one tap. - Every word you tap is saved automatically β€” together with the sentence and the book it came from. - Translate into 9 languages: Korean, Spanish, French, Japanese, Chinese, Russian, Hindi, Vietnamese, and Indonesian. Remember Every Word β€” Spaced Repetition - Your vocabulary list builds itself as you read β€” no manual entry. - Review with spaced-repetition (SRS) flashcards that resurface each word right before you forget it. - Tap any saved word to jump straight back to the exact spot in the book. - Keep a daily streak and a smart reminder nudges you only when words are actually waiting. Your Book Becomes an Audiobook β€” AI Read-Aloud - A natural, human-like on-device AI voice reads your book aloud β€” choose from 10 voices. - The sentence being read is highlighted, so you can follow along with your eyes and ears. - Playback keeps going with the screen off or while you use other apps. - Playback speed from 0.5x to 2x β€” faster on the commute, slower before sleep. - Speech is synthesized on your device, so it works without an internet connection. Read Your Way, Day or Night - 7 fonts and 25 reading themes β€” from Sepia and Night to Rose Quartz, Sage, and Midnight. - Adjust font size and line spacing until the page feels just right. - Choose how you read β€” page turns or continuous scroll. - Read hands-free with auto-scroll β€” 10 speed levels, and a single touch pauses instantly. - Full dark mode plus automatic system-theme sync. - Side-by-Side two-page display mode for comfortable reading on tablets. Loved by readers in 10+ countries. Supports 9 translation languages and works with any DRM-free EPUB or TXT file. Download BookLight today β€” and turn every reading session into a vocabulary lesson! - Privacy Policy: https://pearlismylove.github.io/apps/book-light/privacy-policy.html - Terms And Conditions: https://pearlismylove.github.io/apps/book-light/terms-and-conditions.html - Support: https://pearlismylove.github.io/apps/book-light/support.html

About

ReadAI Smart

Features
Read full description

ReadAI is a smart book reader built for people who want more than just a reading app. Upload your own PDF, EPUB, and FB2 books, read in a clean and comfortable interface, and use AI tools right inside the book. Translate difficult passages, ask questions about what you are reading, listen to text and words, save useful quotes, and build your personal vocabulary as you go. ReadAI helps you stay inside the reading flow while understanding more, remembering more, and coming back to important parts later. Why readers choose ReadAI: β€’ Read your own books in PDF, EPUB, and FB2 β€’ Translate paragraphs and selected text instantly β€’ Ask AI questions about the book while you read β€’ Listen to text and vocabulary with audio support β€’ Save new words to your personal dictionary β€’ Review vocabulary with flashcards and associations β€’ Highlight quotes and keep notes in one place β€’ Search across your books and library β€’ Track reading progress and activity ReadAI is a great fit if you: β€’ Read in English or other languages β€’ Want to combine reading with vocabulary learning β€’ Need one app for reading, translation, and study β€’ Prefer listening to text when a passage feels difficult β€’ Want to save words, notes, and quotes without switching between apps Instead of jumping between an ebook reader, translator, dictionary, notes app, and AI assistant, you get everything in one focused reading experience. Use ReadAI to read with more confidence, understand more of every page, and turn everyday reading into steady learning. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

BookLight4 screens
ReadAI Smart4 screens

Verdict

The call

The clearest difference is update cadence: BookLight at every 4 days against ReadAI Smart's fortnightly. 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. BookLight sells 3 in-app purchases, starting at $0.99 per month and ReadAI Smart sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

BookLight ships an update every 4 days, ReadAI Smart fortnightly. Both last shipped on October 28, 2026.

Scorecard1 real difference Β· 7 level
BookLight versus ReadAI Smart: the parameters behind the verdict, then further details
ParameterBookLightReadAI Smart
PriceFreeFree
Positive reviews100.0% of reviewsβ€”
Update frequencyEvery 4 days β€” betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesβ€”
DevicesiPhone, iPad β€” betteriPhone
Requires iOS16.4 β€” better16.6
Further details β€” not scored
Size94 MB55 MB
Age rating4+4+
DeveloperJungjun LeeVladislav Condratiev

In-app purchases

3 purchases

BookLight

Subscriptions2
  • Monthly Plan$0.991 Month
  • Yearly Plan7 Days trial$7.991 Year
One-time1
  • Lifetime Plan$9.99
2 purchases

ReadAI Smart

Subscriptions2
  • Base Monthly$6.991 Month
  • Pro Yearly$49.991 Year

Questions

Is BookLight free?
BookLight is free to download, with in-app purchases available.
Is ReadAI Smart free?
ReadAI Smart is free to download, with in-app purchases available.
Do BookLight or ReadAI Smart have ads?
Neither BookLight nor ReadAI Smart shows ads.
Which is updated more often, BookLight or ReadAI Smart?
BookLight ships an update every 4 days, and ReadAI Smart fortnightly. Most recently, BookLight was updated on October 28, 2026 and ReadAI Smart on October 28, 2026.

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