SyncBooks! vs ReadGem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SyncBooks!
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SyncBooks! is a multilingual ebook reader that unlocks the “depth” of classic literature with cutting-edge technology. It’s more than just reading – it’s listening, comparing, and learning. Experience public domain masterpieces in a more profound way. 【Key Features】 ・Sentence-by-Sentence Audio Sync Synchronizes text and audio on a sentence-by-sentence basis. The current reading location is highlighted in real-time, allowing you to follow along with both your eyes and ears. ・Multilingual Parallel Display Equipped with high-quality translations powered by LLM. Freely switch between the main and sub languages for a display tailored to your learning style. ・Two Reading Modes Read-Along Mode: An active reading experience synchronized with audio. Novel Mode: A focused reading experience with minimal distractions. ・Audio System Includes recorded narration for original English texts, and utilizes device’s text-to-speech for translated versions, ensuring seamless listening. ・Dictionary Integration Simply tap a word to display the iOS standard dictionary. Check meanings without interrupting your reading flow. ・Public Domain Works Features a curated collection of classic literature with a design optimized for comfortable reading. 【About the Translation】 The translation for this app was generated by AI (LLM). It may contain inaccuracies or unnatural phrasing depending on the context. Please use it as an aid to understanding the original text. 【Recommended for】 ・Those who want to learn a language through literature. ・Those who want to efficiently engage in extensive and intensive reading. ・Those who want to deepen their understanding by comparing original texts and translations. ・Those who want to build a collection of classic works.
ReadGem
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Read books. Learn languages. Read the original. Compare translations. Understand more with AI. ReadGem turns reading into a natural way to learn languages. Explore the original text alongside its translation, compare how the same sentence is expressed across languages, and discover meaning through real books and real context. When a sentence is difficult, ask AI for an explanation. When a translation feels awkward, use AI to suggest a better one. Go beyond simply reading a translation — read, compare, understand, and learn. Read the original and translation together Explore the original text alongside its translation and see how meaning moves from one language to another. Instead of studying isolated words and grammar, experience language through real sentences, expressions, and context from books. Reading becomes learning naturally. Compare translations across languages See how the same sentence is expressed in different languages. Compare translations sentence by sentence and discover differences in wording, expression, and nuance. Whether you're learning English or exploring another language, ReadGem helps you see beyond a single translation. Understand more with AI Some sentences need more than a translation. Ask AI to explain difficult sentences, expressions, context, and nuance. Explore why a sentence means what it does and gain a deeper understanding of both the original text and the language you're learning. Use AI not just to get an answer, but to understand what you're reading. Improve translations with AI Found a translation that sounds awkward or doesn't fully capture the original? Ask AI to suggest a better translation. Compare the suggestion with the original and decide whether it expresses the meaning more naturally and accurately. Exploring better translations can itself become part of learning a language. Read and listen Listen to sentences while you read. Hear pronunciation and rhythm while following the text, and use books to practice listening and pronunciation as well as reading. Everything you need for EPUB reading ReadGem also includes essential EPUB reading features: Table of contents and chapter navigation Highlights and bookmarks Automatic reading position saving Font and reading appearance settings Offline reading for downloaded books ReadGem is for you if you want to: Learn English by reading original books Learn languages naturally through reading Read original text alongside translations Compare expressions across different languages Understand difficult sentences with AI Explore better translations with AI Read. Compare. Understand. Improve. A book is more than something to read. It can also be a rich source of real language and context. With ReadGem, read the original, compare translations, understand with AI, and discover better ways to express every sentence.
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Verdict
The clearest difference is iOS requirement: ReadGem at 17.6 against SyncBooks!'s 26.0. On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | SyncBooks! | ReadGem |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 4 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 16 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | koji ozono | NEXTAOI, Inc |
In-app purchases
SyncBooks!
No in-app purchases
ReadGem
No in-app purchases









