Product Tour · AI EPUB Vocabulary Assistant
How the AI EPUB Vocabulary Annotator Works
Convert Spanish EPUBs into bilingual study editions without reinventing your reading workflow. The assistant automates vocabulary discovery, translation, and packaging so you stay focused on the story.
Three-Step Workflow
1. Upload your Spanish EPUB
Drag and drop any standards-compliant EPUB 3 file. The assistant inspects chapters in memory only—no persistent storage required.
2. Choose CEFR vocabulary coverage
Set the proficiency level you already master (A1–C2). Words above that threshold receive inline English glosses.
3. Download the AI-annotated edition
Receive an EPUB with native ruby annotations that display on Kindle, Apple Books, KOReader, and other modern readers.
Behind the Scenes: Key Features
Ruby-based vocabulary glosses
Glossed words use semantic <ruby> markup, ensuring gloss text remains tethered to the Spanish original without disrupting layout.
Hybrid translation stack
Mix curated CEFR vocabulary with LibreTranslate or MyMemory fallbacks to guarantee coverage of rare terms and idioms.
Privacy-first processing
Files are never written to disk. Temporary artifacts vanish as soon as the annotated download is ready.
Usage-based pricing with subscriptions
Sign in to access three free conversions, then unlock one-off credits ($4.90 each) or subscriptions ($9.90/month or $49.90/year).
Frequently Asked Technical Questions
Will annotations work on my Kindle or tablet?+
Yes. The assistant emits standard EPUB 3 files using native ruby elements. Kindle Scribe, Apple Books, KOReader, and Thorium all display glosses above or below the Spanish word automatically.
Can I use my own LibreTranslate instance?+
Absolutely. Provide a private endpoint and API key to route translations through infrastructure you control, keeping sensitive texts local.
What happens after I use the free conversions?+
You can purchase single credits for $4.90 or switch to unlimited monthly ($9.90) or yearly ($49.90) plans. Subscriptions take effect immediately and unlock all upcoming feature updates.
Experience AI Vocabulary Annotation in Minutes
Upload a Spanish EPUB, choose your CEFR coverage, and download a bilingual edition that keeps you inside the narrative flow.