Document analysis for technical research
4.2 Bottom line: Petal is a strong research tool, best known for cross-document question answering. It has a free plan.
Petal is a document analysis platform that lets you ask questions across your uploaded files and get answers with references. It extracts metadata automatically, deduplicates files, and focuses on technical and scientific documents. It fits researchers and professionals managing a growing collection of dense PDFs.
| Tool | Rating | Free | From | Best known for |
|---|---|---|---|---|
 Petal (this tool) | 4.2 | Yes | $4/mo | Cross-document question answering |
 ResearchRabbit | 4.6 | Yes | Free | Citation network visualization |
 Semantic Scholar | 4.6 | Yes | Free | 200M+ paper index |
 Connected Papers | 4.5 | Yes | $5/mo | Similarity-based paper graphs |
Petal is a strong research tool, best known for cross-document question answering. It offers a free plan, with paid upgrades from $4/mo.
What makes it different: Petal stands out for cross-document question answering.
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Visual citation mapping for literature reviews