LightPDF vs Chatsabi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LightPDF
This app offers a comprehensive suite of tools for managing PDF documents on your mobile device. It leverages AI to summarize, chat with, and convert PDFs, along with scanning capabilities, text extraction, and editing features. It also includes an ID photo maker and watermark removal.
- AI Chat with PDFs
- Phone Scanner to PDF
- PDF to Word/JPG/Excel Converter
- OCR Text Extraction
- PDF Editing and Annotation
- ID Photo Maker
- Watermark Removal
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LightPDF, AI-powered, is a must-have PDF toolkit for your mobile device. You can use it to summarize and chat with PDFs and other documents, and quickly get the key information from the files! And it takes advantage of AI to help you easily scan paperwork to PDFs, extract texts and remove specific objects. It can be your PDF converter, editor, reader, on-the-go mobile scanner, cloud-based PDF storage, and ID photo maker. Try LightPDF to convert, OCR, scan, edit, read, annotate, comment, compress, and merge PDFs easily and quickly to get a high-quality result. And its sharing and collaborating feature can help you communicate smoothly with your colleagues on the same PDF document, and improve your teamwork productivity. What LightPDF can do: Smart AI Chat Assistant for PDFs - Ask questions to the chatbot about your file and it will answer you with cited sources - Quickly output results in markdown and table formats - Chat with PDFs, scans, Excel, Word, PPT, and ePub documents Intelligent Phone Scanner - Take photos of your papers, cards, books, and more to turn them into PDF format. Work as your pocket PDF scanner - Extract and copy texts from paper works - Remove handwriting from the test paper - Advanced filter features for better scanning result Powerful PDF Converter with OCR - Convert PDF to Word, JPG, PNG, Excel, PPT, and TXT, as well as turn Word, PPT, Excel, JPG, PNG, and CAD formats to PDF - Equipped with OCR technology to recognize and turn PDF scans and photos into docx, xlsx, pptx, pdf, and txt formats - Convert multiple documents at the same time and quickly get your work done Cloud-based PDF Editor & Reader - Edit, sign, and add images to a PDF file - Highlight, draw markups, and insert notes into PDF - Reduce PDF file size with a few touches - Combine multiple PDF documents into one - Read PDFs, add bookmarks, search and annotate - Print PDFs directly from your devices - Auto-sync PDFs in order to work with PDFs on the go. No more worry about losing data Handy ID Photo Maker - Create ID and passport photos with ease. It allows you to remove the background, change the background color, and produce a new photo with the selected size - Unblur the photo to enhance its quality and make it clear Image Watermark Removal - AI automatically recognizes and removes watermarks from images, eliminating the need for manual smudging like in Photoshop. It is particularly effective for large logos and full-screen watermarks, enhancing learning efficiency. New Way for Teamwork - Share files via links with your team and invite multiple people to view, edit, highlight, sign, and add comments on the same PDF at the same time - Set permissions to keep PDF security under control - Upload the file to the cloud, and access it on any device - Star files as favorites to quickly find and open them Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. After purchase, please manage your subscriptions in the App Store Account Settings. ------------------------------------------------------------------------------- If you need any help or have suggestions on LightPDF, please feel free to contact us. We can't keep making progress without your voice. Email: support@lightpdf.com Customer Service Center: https://lightpdf.com/contact FAQ: https://lightpdf.com/faqs/lightpdf-editor-faq Privacy Policy:https://lightpdf.com/privacy Terms of Service:https://lightpdf.com/terms
Chatsabi
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Chatsabi is an AI assistant built for answers you can trust. Ask questions in natural language, get clear responses grounded in real sources, and keep the conversation going with follow-ups and voice input. Whether you are researching a topic, drafting an email, summarizing a document, or exploring what is happening in the world today, Chatsabi brings search and conversation together in one focused mobile experience. EARCH AND CHAT YOU CAN RELY ON • Ask anything in plain language — no special commands required • Get answers designed to be clear, useful, and easy to read • See sources and citations so you can verify claims and dig deeper • Turn on web search when you need up-to-date information • Continue the thread with follow-up questions that keep context • Pin, rename, and manage chats when you are signed in VOICE WHEN YOU NEED HANDS-FREE • Tap the microphone to ask by voice • Transcribe speech into text for your next message • Optional spoken replies for a more natural back-and-forth • Great for quick questions on the go GEMS — SPECIALIZED TOOLS IN ONE APP Chatsabi includes Gems: focused workflows for everyday tasks, without switching apps. • Transcribe — turn audio into text • Translate — work across languages • Rewrite — polish tone and clarity • PDF & documents — work with PDFs, Word, Excel, and more • Chart creator — visualize data from spreadsheets • Email agent — connect Gmail or Outlook to search, draft, and manage mail (when you choose to link an account) • Meetings & virtual guest — calendar-aware help when you connect your provider • Lesson tutor & tutor — guided learning support • Site research, YouTube, notes, photo edit, and more Connect only what you use. Many Gems work through secure browser sign-in to your provider — you stay in control. BUILT FOR MOBILE • Clean, dark interface designed for comfortable reading • Fast access to recent and pinned conversations • Composer tools for attachments, web search, and voice settings • Sign in to save chats and sync across devices • Guest mode with limited free chats — upgrade by signing in for more PRIVACY AND PERMISSIONS Chatsabi requests sensitive permissions only when a feature needs them: • Microphone — voice messages and voice-related Gems • Photos / camera — attachments and photo editing (only what you select) • Internet — chat, search, and account features We do not require location, contacts, or broad device access for core chat. Review each permission prompt before you allow access. WHO IS CHATSABI FOR? • Students and professionals who want cited, checkable answers • Anyone tired of vague AI replies without sources • People who juggle email, documents, translation, and research daily • Mobile users who want one assistant instead of many single-purpose apps IMPORTANT Chatsabi can make mistakes. Consider checking important information, especially for health, legal, financial, or safety decisions. Sources help you verify — they are not a substitute for professional advice. GET STARTED Download ChatSabi, ask your first question, and explore Gems from the menu. Create a free account when you are ready to save history and unlock the full experience. Privacy Policy and Terms of Service are available inside the app. Questions or feedback? Use Support in the app menu.
Screenshots
Verdict
The clearest difference is in-app purchases: Chatsabi at none against LightPDF's 10. LightPDF's advantage is update cadence (every 2 weeks vs every 2 months) and iOS requirement (14.0 vs 17.0). On price, ads 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
Both are free to download. LightPDF sells 9 in-app purchases, starting at $13.99 per 7 days. Chatsabi asks for nothing beyond the download.
LightPDF ships an update every 2 weeks, Chatsabi every 2 months. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.
| Parameter | LightPDF | Chatsabi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (54 ratings) — better | — |
| Positive reviews | 88.4% of reviews | — |
| Number of ratings | 54 — better | — |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 113 MB | 66 MB |
| Age rating | 17+ | 17+ |
| Developer | Wangxu Technology Co., Ltd | Mazino Amuno |
Bugs and requests
LightPDF
Reported bugs
5 issues- App requests more money after payment
- Paid subscription not unlocking features
- Trial period charged despite cancellation
- Scans cut off PDF to 3 pages or under
- Performance issues
Requested features
3 requests- iPad support
- Edit text in the exact same font
- More advanced editing features
Chatsabi
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LightPDF
- LightPDF Weekly Subscription$13.997 Days
- LightPDF Monthly Subscription2 variants$19.991 Month
- LightPDF Yearly Subscription$47.991 Year
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- LightPDF Annual Subscription$49.991 Year
- LightPDF Yearly Subscription3 Days trial$59.991 Year
- iOS LightPDF - 1 Week$9.99
- 3-Year Subscription$99.99
- Mac LightPDF Lifetime Plan$109.99
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- Buy 3 yrs Get 3 yrs Free$149.99
Chatsabi
No in-app purchases









