pdf.chat 対照 ChatPDF
真剣に 比較してみよう
ChatPDF: ~1.8M visits/mo · declining (down from ~3.9M in 2024) · GPT-4o / GPT-4o-mini (OpenAI)
ChatPDF is the category leader by traffic and the brand "pdf chat" reverses. It is fully translated, which is why it dominates organic search in Latin America and Brazil, and it adds study extras like flashcards and slides. Its weak spots are citations (page-level, not exact spans) and a billing flow users frequently complain about. pdf.chat's wedge against it is Claude-native, verifiable citations and a genuine free tier with no $1 trap.
| 特徴 | pdf.chat | ChatPDF |
|---|---|---|
| Default model | Claude (Sonnet 4.6 / Opus 4.8) | GPT-4o / GPT-4o-mini |
| Verifiable span-level citations | Yes — native Anthropic Citations API (Pro) | No — page-level only |
| Page-level citations on the free tier | Yes | Yes |
| Free OCR for scanned PDFs | Yes, included | Limited |
| Multi-document chat | Yes | Yes (paid) |
| Flashcards / study tools | Yes | Yes |
| Localized / translated UI | Yes (coverage-gated) | Yes (fully translated) |
| No $1 trial trap, one-click cancel | Yes | Dark-pattern billing reported |
| Free-tier limit | 150 pages/doc, 50 questions/day | ~120 pages, limited daily questions |
競合他社の数値は推定値（2026年中期）であり、価格や制限は頻繁に変動する。 ChatPDF決める前に あの人自身のサイトを 見てみて下さい。
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よくある質問
If you want grounded, verifiable answers, yes. pdf.chat is built around Claude-native, page-cited answers, free OCR for scanned files, and a genuine free tier — the areas where users most often look past ChatPDF.
ChatPDF runs on GPT-4o / GPT-4o-mini (OpenAI). pdf.chat is Claude-native and, on Pro, returns exact-span citations through the Anthropic Citations API — every sentence links to the precise source passage, not just a page number.
ChatPDF is fully translated, which is part of why it leads in non-English search. pdf.chat localizes too, but only ships a language once it is at least 90% translated, so you never land on a half-English page.
Both cite sources, but ChatPDF stops at page-level. pdf.chat matches that on its free tier and goes further on Pro with exact-span citations you can click to highlight the source text — the verification bar for legal, research, and financial work.
pdf.chat has a real free tier with no signup and no $1-to-$19.99 trial trap, and cancellation is one click online. Compare current prices on ChatPDF's own site — they change often — but the free tier means you can try pdf.chat at no cost first.
Yes — there is nothing to migrate. Upload the same PDFs to pdf.chat and start asking. Your ChatPDF account is unaffected, so you can run both side by side and compare the answers before you decide.