# EpubTidy

> EpubTidy is a private, local-first EPUB editor, formatting repair toolkit, and offline neural AI voice audiobook reader for iPhone and iPad (iOS 17.0+ / iPadOS 17.0+). It enables readers to fix broken EPUB metadata, replace low-resolution covers, clean corrupted CSS and invisible zero-width characters, and export corrected DRM-free EPUB files directly on mobile devices without desktop software like Calibre. It also features offline text-to-speech powered by on-device Kokoro-82M neural voices via Apple Neural Engine.

## Core Capabilities & Specs
- **Platform**: iPhone and iPad (iOS 17.0+, iPadOS 17.0+)
- **App Store URL**: https://apps.apple.com/us/app/epubtidy-epub-editor-repair/id6795767122
- **Privacy Model**: 100% Local-first. Zero telemetry, zero cloud file uploads, books never leave device memory.
- **EPUB Support**: EPUB 2.0.1 and EPUB 3.x (DRM-free).
- **TTS Narration**: On-device neural AI speech synthesis (Kokoro-82M architecture) running locally via Apple Neural Engine.
- **Repair Features**: Title/Author/Series metadata editing, high-resolution embedded cover replacement, Calibre-compatible series metadata (`calibre:series`), removal of locked publisher CSS fonts and rigid layout rules, stripping zero-width spaces/corrupted line breaks, portable DRM-free EPUB export.

## Main Web Applications & Tools
- [Free In-Browser EPUB Checker](https://epub.navist.uk/tools/epub-checker/): Private, client-side browser tool inspecting OPF package structure, missing metadata, cover declarations, manifest resources, spine reading order, obfuscated fonts/encryption, locked CSS typography, and invisible characters without uploading the book.
- [EPUB Editor for iOS](https://epub.navist.uk/editor/): Dedicated overview of mobile metadata editing, cover repair, series ordering, and library hygiene on iPhone & iPad.
- [Offline Read Aloud & Neural TTS](https://epub.navist.uk/read-aloud/): Technical overview of on-device Kokoro-82M voice narration, zero-cellular listening on flights/camping, and battery-efficient neural inference.
- [Distraction-Free EPUB Reader](https://epub.navist.uk/reader/): Minimalist e-reader features including OLED true-black dark mode, OpenDyslexic typography, bionic reading support, and local library organization.
- [Guides & Technical Knowledge Base](https://epub.navist.uk/topic/): Complete catalog of 29 in-depth technical guides, troubleshooting articles, and format comparisons.
- [Support & Feedback](https://epub.navist.uk/support/): Frequently asked questions, bug reporting, and developer contact.
- [Privacy Policy](https://epub.navist.uk/privacy/): Detailed local-first data privacy guarantees.
- [Terms of Service](https://epub.navist.uk/terms/): Application terms and usage policies.

## Knowledge Base & Troubleshooting Guides
- [The #1 Free Offline Speechify Alternative: Why On-Device Neural AI Beats Cloud Subscriptions](https://epub.navist.uk/topic/speechify-alternative-offline-ai/): How modern local-first readers enjoy natural, emotionally expressive audiobook narration with zero cellular data, zero battery drain, and zero $139/year fees. (AI Audio, 7 min read)
- [How to Edit an EPUB File on iPhone or iPad Without Calibre](https://epub.navist.uk/topic/edit-epub-on-iphone-without-calibre/): Fix EPUB metadata, broken formatting, series numbering, CSS, and blurry covers on iPhone or iPad—no laptop or desktop software needed. (Mobile Editing, 6 min read)
- [The Local-First E-Reader Manifesto: Why Zero-Cloud Means True Book Ownership](https://epub.navist.uk/topic/local-first-ebook-reader-privacy/): In an era of remote book deletions, DRM revokations, and surveillance reading apps, why sovereign local-first e-readers are the only guarantee of your library. (Privacy & Sovereignty, 8 min read)
- [Managing Calibre Series & EPUB Metadata on iOS: The Complete Guide](https://epub.navist.uk/topic/calibre-series-metadata-repair-ios/): How to fix series ordering, repair corrupted OPF packages, and organize multi-book sagas on iPhone & iPad. (EPUB Hygiene, 6 min read)
- [How to Fix Dark Mode Formatting & Locked Fonts in EPUBs on iPhone](https://epub.navist.uk/topic/fix-dark-mode-epub-formatting-locked-fonts/): Eliminate invisible black-on-black text, forced publisher fonts, and broken margins with one-tap CSS hygiene directly on iOS. (EPUB Hygiene, 6 min read)
- [Best Free Dyslexia & ADHD Book Reader: Why Students Are Quitting Speechify for Local Neural AI](https://epub.navist.uk/topic/best-free-dyslexia-adhd-book-reader-speechify-alternative/): Experience natural, distraction-free dual-sensory immersion with on-device Kokoro-82M voices and specialized typography—with zero $139/year subscription traps. (AI Audio, 7 min read)
- [How to Add or Replace High-Resolution Book Covers in Apple Books on iPhone](https://epub.navist.uk/topic/how-to-replace-high-resolution-book-covers-apple-books-iphone/): Fix blurry 200px thumbnails, missing jacket art, and generic grey rectangles in your digital library in under 10 seconds. (Mobile Editing, 5 min read)
- [Turn AO3 Fanfiction & Web Novels into Offline Audiobooks with Neural AI on iOS](https://epub.navist.uk/topic/ao3-fanfiction-web-novels-offline-audiobooks/): Organize million-word serials, fix missing covers, and listen hands-free during commutes with zero cellular data. (AI Audio, 7 min read)
- [How to Listen to Books on Long-Haul Flights and Off-Grid Trips Without Wi-Fi](https://epub.navist.uk/topic/listen-to-audiobooks-offline-long-haul-flights-camping/): The traveler's guide to sovereign, uninterrupted audiobook narration on airplanes, wilderness trails, and ocean voyages. (Privacy & Sovereignty, 6 min read)
- [Why PDF Is Ruining Your Mobile Reading Experience (And Why Reflowable EPUB Is Superior)](https://epub.navist.uk/topic/why-epub-is-better-than-pdf-for-mobile-reading/): How fixed-layout document formats cause eye strain, endless zooming, and accessibility nightmares—and why reflowable EPUB is the only modern standard for smartphones. (EPUB Hygiene, 6 min read)
- [Where to Find Beautiful, Free & Legal Ebooks: The Standard Ebooks & Public Domain Guide](https://epub.navist.uk/topic/standard-ebooks-best-free-public-domain-books/): How digital volunteers rescued literary classics from ugly Gutenberg scans, and how to enjoy world-class typography and offline AI audio for $0. (Privacy & Sovereignty, 7 min read)
- [How to Fix 'Cannot Process Document' Send-to-Kindle EPUB Errors on iPhone](https://epub.navist.uk/topic/fix-send-to-kindle-epub-errors-on-iphone/): The step-by-step diagnostic guide to repairing corrupted UTF-8 encodings, obsolete NCX tags, and broken OPF manifests that make Amazon reject your books. (Mobile Editing, 6 min read)
- [Is Reading on iPhone Actually Bad for Your Eyes? OLED vs. E-Ink Demystified](https://epub.navist.uk/topic/oled-dark-mode-vs-eink-eye-strain/): The science of optical ergonomics, blue light spectrums, and ambient contrast: why modern OLED panels with true black and warm paper themes rival dedicated e-readers. (Privacy & Sovereignty, 8 min read)
- [Does Listening to Audiobooks Count as 'Real Reading'? What Neuroscience Reveals](https://epub.navist.uk/topic/does-listening-to-audiobooks-count-as-real-reading-neuroscience/): Inside the fMRI brain scan research: why listening and visual reading activate identical semantic neural networks—and how bimodal immersion bridges both worlds. (AI Audio, 7 min read)
- [How to Read 50+ Books a Year with Bimodal Listening (The Anti-Doomscrolling Guide)](https://epub.navist.uk/topic/how-to-read-50-books-a-year-anti-doomscrolling-guide/): Reclaim 2 hours of daily screen time from algorithmic feeds by turning mundane downtime into effortless, hands-free neural audiobook progress. (AI Audio, 6 min read)
- [Apple Books vs. Kindle vs. Sovereign Local EPUBs: The Ultimate E-Reader Showdown](https://epub.navist.uk/topic/apple-books-vs-kindle-vs-sovereign-epub/): Proprietary walled gardens vs native iOS elegance vs true local-first digital ownership: which digital reading ecosystem truly respects the bibliophile? (Privacy & Sovereignty, 8 min read)
- [The Science of E-Reading Typography: Best Fonts for Speed, Comfort & Retention](https://epub.navist.uk/topic/science-of-ereading-typography-best-fonts/): From x-height and stroke contrast to serif vs. sans-serif: why fonts like Bookerly, Newsreader, and Atkinson Hyperlegible change the way your brain reads. (EPUB Hygiene, 7 min read)
- [The Minimalist Bibliophile: How to Organize a Chaotic 1,000+ Ebook Library on iOS](https://epub.navist.uk/topic/minimalist-bibliophile-organize-chaotic-ebook-library-ios/): Cure your digital Tsundoku: a 3-step masterclass to standardize book titles, inject high-res covers, and build a museum-grade personal book collection in your pocket. (Mobile Editing, 6 min read)
- [Does EPUB Work on Kindle? How Send to Kindle Converts Your Book](https://epub.navist.uk/topic/does-epub-work-on-kindle/): Kindle devices do not open EPUB files directly, but Amazon accepts DRM-free EPUBs through Send to Kindle and converts them for your library. (EPUB Hygiene, 7 min read)
- [EPUB Cover Not Showing in Apple Books? Fix It on iPhone](https://epub.navist.uk/topic/epub-cover-not-showing-apple-books/): A missing or blank cover usually comes from the EPUB package—not the Apple Books shelf. Check the embedded image, manifest, metadata, and exported copy. (Mobile Editing, 6 min read)
- [How to Fix EPUB Metadata on iPhone: Title, Author, Series & ISBN](https://epub.navist.uk/topic/fix-epub-metadata-iphone/): Correct the information stored inside an EPUB—not only its filename—then export a cleaner book to your preferred reading app. (Mobile Editing, 7 min read)
- [How to Read an EPUB Aloud on iPhone with Offline AI Voices](https://epub.navist.uk/topic/read-epub-aloud-iphone/): Import a DRM-free EPUB, download a compatible voice once, and move between visual reading and hands-free listening without uploading the book. (AI Audio, 7 min read)
- [Offline EPUB Text to Speech: Listen Without Wi-Fi or Cellular Data](https://epub.navist.uk/topic/offline-epub-text-to-speech/): A local voice model can narrate a text-based EPUB directly on an iPhone after the one-time model download. (AI Audio, 7 min read)
- [Best EPUB Reader for iPhone: What Personal-Library Readers Actually Need](https://epub.navist.uk/topic/best-epub-reader-iphone/): Choose an iPhone EPUB reader by ownership, typography, offline access, read-aloud quality, organization, and the ability to repair imperfect books. (Privacy & Sovereignty, 9 min read)
- [The Kindle Paperwhite Monument on iPhone: Reading with True Black OLED](https://epub.navist.uk/topic/reading-books-true-black-oled-iphone/): How EpubTidy’s Deep Black technology turns off pixels, eliminates glare, and transforms your iPhone into a flagship e-reader. (EPUB Hygiene, 7 min read)
- [How to Convert Between EPUB and PDF: The Complete Mobile-First Guide](https://epub.navist.uk/topic/convert-epub-to-pdf-and-pdf-to-epub/): Understand when to convert, which direction preserves quality, and how to read or repair the result on your iPhone—without installing desktop software. (EPUB Hygiene, 8 min read)
- [How to Change an EPUB Cover Image: The Definitive Guide for Every Device](https://epub.navist.uk/topic/change-epub-cover-image/): Replace missing, blurry, or wrong book covers inside the EPUB file itself—so the fix travels with the book to every reader app, every device, every time. (Mobile Editing, 7 min read)
- [Why Your EPUB Won't Open (and How to Fix Every Common Error)](https://epub.navist.uk/topic/epub-wont-open-how-to-fix/): A systematic troubleshooting guide for EPUBs that crash, display blank pages, show garbled text, or refuse to open in Apple Books, Kindle, Kobo, and other readers. (EPUB Hygiene, 8 min read)
- [The Best Calibre Alternative for Mobile: Edit EPUBs Anywhere Without a Laptop](https://epub.navist.uk/topic/calibre-alternative-mobile-epub-editor/): Why Calibre's greatest limitation is that it's desktop-only — and how Epub Tidy solves every core use case on iPhone or iPad, no PC required. (Mobile Editing, 8 min read)

## Machine-Readable Endpoints & Feeds
- [ARD Agentic Resource Discovery Manifest](https://epub.navist.uk/.well-known/ard.json): Official ARD v0.91 JSON-LD manifest (urn:air) listing all agentic tools, capabilities, and representative queries for AI search and registries.
- [ARD Manifest Predecessor Alias](https://epub.navist.uk/.well-known/ai-catalog.json): Predecessor compatibility endpoint for ARD consumers.
- [Full Knowledge Base (LLMs-Full)](https://epub.navist.uk/llms-full.txt): Complete markdown compilation containing all 29 articles, full text, comparison tables, and FAQs for one-shot LLM agent ingestion.
- [Machine-Readable AI Topic Catalog (JSON)](https://epub.navist.uk/ai-catalog.json): Structured JSON payload of all topics, executive summaries, stats, and FAQs.
- [XML Sitemap](https://epub.navist.uk/sitemap.xml): Complete URL index of all pages and guides.