Spine vs Quill
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spine
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Read a chapter. Copy it cleanly. Continue in the language model you already use. Spine is a focused EPUB reader for people who want to read alongside an LLM without putting AI inside the bookshelf. One tap copies the current chapter as clean plain text, with the book, author, and chapter title included. Select a passage when you only need a smaller excerpt. Prefer to listen? Spine reads aloud with Apple voices installed on your iPhone, iPad, or Mac. Choose a voice and adjust its rate, pitch, and volume—without a voice account or a cloud reader. Your library stays private. Spine has no built-in model, requires no account, and does not upload book content. What you copy is yours to paste wherever you choose. Spine also includes: - EPUB 2 and EPUB 3 support - Chapter navigation and in-chapter search - Reading-position restoration - Bookmarks and inline notes - Adjustable type, size, and line spacing - Drag-and-drop and system document opening - Guardrails for unusually large or malformed files Spine reads DRM-free EPUB files. It does not decrypt DRM-protected books.
Quill
This application enhances your reading experience by providing AI-powered definitions, translations, and contextual explanations for any word or passage within your imported EPUB and PDF books. It offers instant insights to deepen comprehension.
- AI-powered explanations
- Instant definitions
- Contextual understanding
- Import EPUB and PDF
- Word and passage lookup
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Quill is an ebook reader with built-in AI that helps you understand what you read. Import your EPUB and PDF books, then tap any word or passage to get instant definitions, translations, and contextual explanations
Screenshots
Verdict
The clearest difference is device support: Spine at 3 against Quill's 1. Quill's advantage is iOS requirement (17.0 vs 26.0). On price, ads and in-app purchases 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 | Spine | Quill |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | — | Every 9 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, Mac — better | iPhone |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Thought Tides LLC | 思涵 岳 |
In-app purchases
Spine
No in-app purchases
Quill
No in-app purchases
