Two research & learning tools, one decision. Here is the honest split.
| ChatPDF | Semantic Scholar | |
|---|---|---|
| Pricing | Freemium | Free plan |
| Best at | Contracts, papers, manuals, and reports you need answers from without reading cover to cover. | Mapping a field: who cites what, key papers, and research feeds. |
| In short | Upload a PDF, ask it questions. The fastest way to interrogate a long document. | A free AI-powered academic search engine with citation graphs and one-line paper summaries. |
| On Atlas | 3 starter prompts | 3 starter prompts |
Pick ChatPDF when the job is Contracts, papers, manuals, and reports you need answers from without reading cover to cover.. Pick Semantic Scholar when the job is Mapping a field: who cites what, key papers, and research feeds.. Still torn? Run one real task through both free tiers. An hour of testing beats a week of reviews.
Summarize the strongest evidence for and against [claim]. Cite primary sources only, rate the strength of the evidence, and end with what is still unknown.