Spaced vs PDF AI Reader

Spaced is a simple, effective vocabulary trainer language learning, built around spaced repetition. Review words and characters at the right moment—before you forget them—and build long-term memory with just a few minutes a day. Originally created to help our daughters learn Simplified Chinese characters (汉字 / Hanzi), Spaced has grown into a flexible tool designed especially for learning Chinese vocabulary, phrases, and characters in a structured way. WHY SPACED Spaced began as a physical Leitner box full of flashcards—useful for memorization, but not very portable. We turned that system into a lightweight app focused on efficient, long-term learning, especially for Chinese vocabulary and Hanzi. HOW IT WORKS Spaced is built around the forgetting curve: review information at increasing intervals to retain it longer. • Create a WordList for what you want to learn (such as Chinese vocabulary or Hanzi sets) • Study briefly each day • Remembered items move up through levels • Forgotten items return for reinforcement The app automatically schedules reviews using a 56-day spaced repetition cycle. CREATE YOUR WORDLISTS Create WordLists for anything you’re learning—commonly Chinese HSK levels, Hanzi character sets, vocabulary themes, or textbook content. Add words manually or use built-in Simplified Chinese lists. Each item supports notes, example sentences, and optional hints. STUDY Tap Start to begin a session. If you take a break, Spaced resumes where you left off. The Home screen shows your next scheduled review. To make learning more engaging, Spaced also includes voice recognition for pronunciation practice and fun learning games to reinforce recall in a more interactive way. STARRED WORDS Mark difficult items for extra practice. Filter by starred words, star levels, or use weighted mode to surface harder items more often. REVISION AND TESTING Spaced includes two study modes: • Revision (Levels 1–2): Build familiarity with new material • Test (Levels 3–7): Check what you know through recall Correct answers advance; incorrect ones return for reinforcement. External keyboard controls are supported. ICLOUD SYNC Your progress stays up to date across devices. Spaced uses iCloud and CloudKit to automatically sync WordLists, progress, and starred items. STAY CONSISTENT A few minutes a day can make a big difference. Keep going, trust the process, and build lasting vocabulary step by step. Happy studying with Spaced. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

PDF AI Reader — Read, Listen, Learn PDF AI Reader is an all-in-one reading, study and teaching tool for English learners and PDF readers. PDF reading, OCR tap-to-read, AI translation and explanation, multi-engine speech, annotation and interactive learning in one app. Turn one PDF into multiple languages and formats in real time. SMART TAP-TO-READ: SEE IT, HEAR IT Open any PDF and the app recognizes page text and marks it with red frames. Tap any text to: • Hear the whole sentence read aloud, with smart joining across line breaks • Translate instantly into Chinese, box above the text • Follow along: after each sentence the app listens, scores your reading and helps you build natural pronunciation Sentence boundaries, speech bubbles and phrases are detected, so textbooks and picture books both work. Import any English book and it becomes a talking book. Ten offline voices are free forever, with no membership or API key. IMMERSIVE PLAYER Tap text to open the player: read the whole sentence or word by word, drag it anywhere, read the translation aloud, loop or play in the background. AI COMPANION READING AND AI Q&A • AI Companion Reading: deep page-level explanation, custom prompts, presets and cached translations • AI Q&A: multimodal chat on the page screenshot with reasoning, web search and voice questions; history saved per page • AI Circle-to-Explain: select any area for an instant explanation • Dictionary: tap a word for definition and phonetics MULTI-ENGINE SPEECH • Offline engines (Supertonic / sherpa-onnx): no network or API key, Chinese and English, adjustable voice and speed • Qwen: multilingual voices, emotional control • Doubao: rich character voices, including Shanghai and Beijing dialects Adjust speed and volume, and keep listening after you leave the page. WORD LEARNING, END TO END • Word Memory: AI cards with SM-2 spaced repetition and four review games (spelling, listen-and-choose, missing letters, handwriting) • Dictation Assistant: pick words from Photos, camera or a book; AI recognizes words and meanings; local-speech dictation; four activities and history replay • Image Memory: Anki-style picture cards MORE STUDY TOOLS • Speaking Practice: talk about the page with live AI feedback • Create PPT: PPTX Studio turns page content into slides with text, images, audio, video and shapes, exported as .pptx • HTML Interactive Lessons: AI courseware you can run, play and save for reuse • Infinite Canvas: a teaching whiteboard with unlimited pan and zoom, freehand notes and AI analysis of circled content • Apple Pencil: handwriting is OCR-recognized and read aloud, merged with the page and saved LIBRARY AND IMPORT • Import from Files, camera, Photos, share sheet or drag and drop • Folders, drag-to-organize, cover previews • Full-screen reading, page memory, thumbnails, local storage VIP SUBSCRIPTION Weekly ¥12 / week, Monthly ¥45 / month, Yearly ¥398 / year (best value). Includes AI tap-to-read, AI Companion Reading, PDF Q&A, AI dictionary, circle-to-explain, fast PPT extraction, AI word dictation, Word Memory and HTML lessons. SUBSCRIPTION TERMS • Auto-renewing Apple subscription, renewed within 24 hours before each period ends • Charged to your Apple ID within 24 hours before the period ends • Cancel: Settings → Apple ID → Subscriptions → PDF AI Reader. Benefits last to the end of the period • Refunds: apply via Apple at reportaproblem.apple.com LEGAL Privacy Policy: https://yidiantong.website/privacy.html Books, notes and chats stay on your device. Content is sent to third-party AI services (Alibaba Cloud Bailian / Volcano Engine) only when you use AI features, with your consent. No personal data is collected, no ad or tracking SDKs. Terms of Use (EULA): https://yidiantong.website/terms.html Covers subscription rules (weekly ¥12, monthly ¥45, yearly ¥398, auto-renewal), acceptable use, IP and disclaimers.