Option A: Perplexity: traces the chain, you open every page
Best when: A claim circulating in public web coverage
What it does: Perplexity traces and drafts; you open every page
Strong at: Real-time web search with numbered citations
Limit: Every edge needs a manual open-and-confirm pass
Free plan: Yes
Option B: scite: citing passages with labels, you map the chain
Best when: The claim sits in the academic literature with an indexed paper
What it does: scite lists citing passages; you map the chain
Strong at: Extracted citing passages with supporting, mentioning or contrasting labels
Limit: Indexing gaps exist; an unindexed target blocks this path
Free plan: Paid plan needed
Option C: Gemini Notebook: drafts the chain map and loop check
Best when: The chain should stay inside the supplied articles
What it does: Gemini Notebook drafts map and loop check; you check
Strong at: Answers use only your sources, with direct-quote citations
Limit: Sources outside the supplied set are not found
Free plan: Yes, limited (50 sources per notebook)