Bulb: Lexicon & Language App

Learn languages by reading real books and browsing websites with AI-powered translation and writing feedback.
Bulb combines EPUB reading with AI writing coaching for language learners. Import any EPUB book, browse websites with built-in translation, build contextual vocabulary, and receive detailed AI essay feedback. Designed for professionals, students, and anyone learning through authentic content.
=== AI WRITING COACH ===
INSTANT AI ESSAY FEEDBACK
Get detailed grammar, style, and vocabulary analysis for your writing. Identify specific error patterns with visual charts. Receive personalized suggestions to improve your language skills. Track your writing progress over time.
READ ANY EPUB BOOK
Import your own EPUB books and read in your target language. Tap any word for instant translation and pronunciation. Double-tap sentences for contextual understanding. Create bookmarks and highlights as you read.
SMART VOCABULARY BUILDING
Words are automatically saved to flashcard sets as you read. Practice with spaced repetition algorithms. Generate contextual sentences for each word. Build vocabulary naturally through immersive reading.
=== BROWSE THE WEB AND LEARN ===
TRANSLATE ANY WEBSITE
Read articles in your target language with built-in translation. Tap words for instant definitions. Save interesting vocabulary while browsing. Practice comprehension with real-world content.
CONTEXTUAL SENTENCE PRACTICE
Generate practice sentences for saved words. Translate between your native and target language. Get AI feedback on your translations. Learn grammar rules in context.
=== SUPPORTED LANGUAGES ===
English, Spanish, French, German, Chinese, Japanese, Italian, Portuguese, Russian, Korean, Arabic, Serbian
=== WHAT MAKES BULB UNIQUE ===
AI WRITING COACH
Advanced AI essay analysis for language learners. Get detailed feedback on grammar, vocabulary, and style mistakes.
REAL BOOK READING
Learn by reading actual EPUB books, not artificial exercises. Import any book from your library.
CONTEXTUAL VOCABULARY
Build vocabulary from words you encounter while reading. Learn in context, not isolation.
SMART FLASHCARDS
Automatically generated flashcard sets from your reading. Spaced repetition keeps words in long-term memory.
ICLOUD SYNC
Your vocabulary syncs automatically across all your iOS devices.
=== DESIGNED FOR ===
• Business professionals improving writing skills
• Students preparing for language exams
• Book lovers learning new languages
• Anyone who prefers authentic content over artificial lessons
=== PREMIUM FEATURES ===
• Enhanced AI essay feedback with detailed error analysis
• Unlimited vocabulary practice and flashcard generation
• Priority customer support
• Advanced writing improvement suggestions
Requires internet connection for AI features and translation.
Privacy Policy: https://thebulb.app/privacy
Terms of Service: https://thebulb.app/terms
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