SegLingo vs PDF AI Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SegLingo
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SegLingo – Create an Immersive AI English Reading Experience Want to improve your English reading and learning efficiency? SegLingo combines artificial intelligence with immersive reading design, helping you quickly understand English content while building your vocabulary. Whether it’s files, images, or camera scans, everything can be easily converted into smooth, readable eBooks. Intelligent translation and vocabulary management allow you to start an efficient learning journey anytime, anywhere. Key Features Multi-format File Upload Supports text, PDF, Word, images, and camera input Automatically recognizes English content and generates beautiful, readable offline eBooks Immersive Paragraph Reading The system splits eBook content into paragraphs, each with AI translation available Freely choose to show or hide translations Switch seamlessly between original text and translation Creates an immersive reading atmosphere, helping you understand without relying on translation AI Intelligent Translation Uses advanced large models, surpassing traditional dictionaries and mechanical translation Preserves context and literary style, helping you grasp the meaning faster Personalized Reading Experience Toggle paragraph-by-paragraph translation on or off Adjustable font size, line spacing, and layout Suitable for learners of all levels Use Cases Reading English novels, reports, and academic articles Studying professional English documents Daily reading and vocabulary accumulation for English learners Preparing for study abroad or professional courses Why Choose SegLingo? Smarter than traditional eBooks: built-in AI translation and immersive bilingual switching More natural than ordinary translation apps: retains original text structure to help develop language intuition More efficient than typical vocabulary notebooks: centralized management across files for easy review SegLingo is more than a reader—it’s your English learning assistant. Download now and start your immersive English reading journey! 【In-App Purchase Description】 Membership Benefits: Daily high-limit Tokens to meet your needs. Purchase cycle: 1 week (weekly subscription). Payment: Once the user confirms the purchase and completes the payment, it will be charged to the iTunes account. Renewal: The Apple iTunes account will automatically deduct the fee for renewal 24 hours before the expiration date, extending the subscription period by one cycle. 【Related Agreements】 User Agreement http://www.5258mall.com/seglingo/service_agreement_en.html Privacy Policy http://www.5258mall.com/seglingo/privacy_policy_en.html 【GET IN TOUCH】 Drop us a line: chuanwang315app@gmail.com Can't wait to hear your thoughts and make this app even better for you!
PDF AI Reader
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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.
Screenshots
Verdict
The clearest difference is price: SegLingo at Free against PDF AI Reader's $0.99. SegLingo also leads on iOS requirement (15.0 vs 18.6). PDF AI Reader's advantage is update cadence (every 5 days vs every 10 months). On ads, in-app purchases and device support 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
SegLingo is free to download; PDF AI Reader costs $0.99 up front. SegLingo sells 1 in-app purchase, starting at $0.99 per 7 days and PDF AI Reader sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.
SegLingo ships an update every 10 months, PDF AI Reader every 5 days. The most recent releases landed on November 5, 2026 and November 7, 2026 respectively.
| Parameter | SegLingo | PDF AI Reader |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 10 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 191 MB | 836 MB |
| Age rating | 4+ | 17+ |
| Developer | 仲川 刘 | 勋才 王 |
In-app purchases
SegLingo
- Weekly$0.997 Days
PDF AI Reader
- Weekly VIP$1.997 Days
- Monthly VIP$5.991 Month
- Yearly VIP$59.991 Year









