Summaries, documents & PDF · 5 tools compared
Last verified:
Prices may changeStudent, free
Lilys AI ◐Free plan
Delivers smooth Korean summaries and handles YouTube, PDFs, and web links in one place. The free limit is enough for school assignments.
Papers, long reports, and exact citations
Gemini Notebook ◐Free plan
Pinpoints exact source locations for every sentence in its answer. Lets you upload multiple sources together, and the free limit is generous.
No sign-up
ChatPDF ◐Free plan
Drag and drop a file to ask questions immediately without signing up. Free tier easily covers one or two short documents.
When you need to turn summaries straight into reports
Claude ◐Free plan
Handles reading and writing in a single prompt. Accurately follows instructions for specific writing styles and formats.
Korean first
Lilys AI ◐Free plan
As a Korean service, its UI, summaries, and customer support are entirely in Korean.
| Item | Lilys AI | Gemini Notebook | ChatPDF | Claude | Perplexity |
|---|---|---|---|---|---|
| Price | ◐Free plan | ◐Free plan | ◐Free plan | ◐Free plan | ◐Free plan |
| Free limits | Unlimited AI reports and chats. Supports YouTube, video files, PDFs, and web pages. | Free with a Google account. Limits on number of notebooks, sources, and daily queries. | 2 documents per day (page and question limits per file: verify) | Free plan available; hourly message limits apply (further reduced during peak times) | Unlimited basic searches, daily limit on advanced (Pro) searches |
| Paid price | Starter ₩6,320/month · Basic ₩15,920/month · Pro ₩51,120/month (billed annually) | Higher limits included with Google AI Pro subscription | Plus $19.99/month | Pro $20/month ($17/month billed annually) · Max from $100/month | Pro $20/month ($200/year) · Max $200/month ($2,000/year) |
| Korean | ○KoreanKorean service. Both UI and summaries default to Korean. | ○KoreanSupports Korean sources, questions, and answers. Audio Overview (podcast) supports Korean. | △PartialThe UI is mostly in English. Korean PDFs, as well as Korean questions and answers, work well. | ○KoreanKorean support for both UI and chat. Generates Korean text with natural tone control | ○KoreanBoth UI and answers support Korean. Proportion of Korean sources is relatively low |
| Login | Required | Required | Optional | Required | Optional |
| File input | PDF, YOUTUBE, URL, AUDIO, TXT | PDF, TXT, MD, AUDIO, YOUTUBE, URL | PDF | PDF, IMAGE, TXT, DOCX, CSV, XLSX | PDF, IMAGE, TXT |
| Platforms | Web · iOS · Android · Browser extension | Web · iOS · Android | Web | Web · iOS · Android · macOS · Windows | Web · iOS · Android · Windows · macOS |
| File limit | Varies by plan, paid plans required for long videos | 500k words and 200MB per source, free tier allows 50 sources per notebook | Free: 120 pages and 10MB, Plus: 2,000 pages | 30MB per file, 20 files per conversation | Free tier has daily upload limits |
| Citations | Weak (focused on summarization) | Sentence-level source location citations | Page numbers | Cites upon request, no automatic display | In-file evidence + live web sources |
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Lilys AI is the only Korean service here. It handles YouTube, PDFs, and audio, generating smooth Korean summaries and timelines with an intuitive interface. Source citations are weak, so verify claims. Free tier has monthly limits on uses and video length.
Gemini Notebook acts as a research notebook grounded in your sources. It cites exact sentences from uploaded PDFs and links, making it ideal for papers. It is free with a Google account and has generous limits, though table and chart analysis remains basic.
ChatPDF is the simplest option. Drag and drop a file to get instant summaries and sample questions without logging in. It replies in Korean. However, it only supports PDF files, and the free tier is limited to 2 files (up to 120 pages) per day.
Claude excels at reading long documents and writing drafts on the spot, strictly following tone and formatting prompts. It also accepts images and Excel files. However, free usage limits run out quickly with large files, and it lacks auto-citations.
Perplexity blends uploaded files with live web search, making it great for cross-referencing papers against recent trends. If you only need deep file analysis, dedicated tools are better. The free tier limits daily uploads and advanced searches.
When choosing an AI PDF tool, consider four factors. First, citation accuracy: sentence-level references are vital if you plan to cite findings. Second, free limits: check caps on daily uploads, page counts, or prompts. Third, supported formats: decide if you need only PDF support or also YouTube, audio, and web links. Fourth, Korean support: native UI and natural Korean output matter for ease of use. For business data, also verify training policies in the terms.
| Situation | Pick | Why |
|---|---|---|
| 🎒 Student, free | Lilys AI | Delivers smooth Korean summaries and handles YouTube, PDFs, and web links in one place. The free limit is enough for school assignments. |
| 📎 Papers, long reports, and exact citations | Gemini Notebook | Pinpoints exact source locations for every sentence in its answer. Lets you upload multiple sources together, and the free limit is generous. |
| ⚡ No sign-up | ChatPDF | Drag and drop a file to ask questions immediately without signing up. Free tier easily covers one or two short documents. |
| 💼 When you need to turn summaries straight into reports | Claude | Handles reading and writing in a single prompt. Accurately follows instructions for specific writing styles and formats. |
| 🗣️ Korean first | Lilys AI | As a Korean service, its UI, summaries, and customer support are entirely in Korean. |
Not a ranking. Different situations, different answers.
Last verified:
Prices may change; confirm on each official site before paying. A comparison's verified date is the oldest of the comparison and its tools.
A Korean service summarizing videos, PDFs, and web posts in Korean.
A research notebook that answers only from your files with citations
The simplest tool to upload a PDF and ask questions right away
A conversational AI strong at reading and writing long texts
An AI search engine that answers with sources