Overview
Both Connected Papers and SciSpace help researchers find relevant papers. Connected Papers is a tool built on content similarity and co-citation structure. SciSpace is a workspace that answers questions, reads papers, extracts from them and drafts writing.
Connected Papers can provide a cleanest visual graph. Dropping a single seminal paper in and immediately seeing which clusters exist around it, a good way to orient in an unfamiliar field. The Prior Works and Derivative Works views trace an idea’s ancestry and its descendants.
The free tier has limitations. Only five graphs a month is genuinely tight for active literature work.
Connected Papers cannot read the papers. There is no summarisation, no extraction of findings across studies, no persistent collection that grows with your project, and no writing support. SciSpace covers the downstream half: cited answers with line-by-line inline citations, PDF chat to interrogate a methods section, extraction of study details across papers into a comparison table, systematic reviews, and a cited draft in the same place.
A graph built on citation structure will always under-represent work that has not been cited yet, and reviewers consistently note that very recent publications take time to appear. Library guides add thinner coverage for monographs, textbooks and non-English work.
Our verdict
Connected Papers and SciSpace solve problems at opposite ends of a literature review.
 Choose Connected Papers if you want to… |  Choose SciSpace if you want to… |
|---|---|
| Orient fast in an unfamiliar field from one seed paper | Ask a research question and get cited, ranked answers |
| Trace an idea’s prior and derivative works visually | Read and interrogate the PDFs you find |
| Keep costs minimal — free to try, $6/mo for academics | Extract findings across papers into a comparison table |
| Use a focused instrument rather than a workspace | Carry the synthesis into a cited draft in the same workspace |
Summary vs synthesis: the difference that matters most
A strong literature review synthesizes rather than summarizes. Summarizing lists what each paper said, one after another. Synthesis groups studies by theme, method, or argument — showing where the field agrees, disagrees, and leaves gaps.
Connected Papers shows you that a field has structure, before you have read anything. That is real value at the cold start. But a similarity graph groups papers by how they cite and resemble each other, which is not the same as grouping them by argument — two papers can sit in the same cluster and reach opposite conclusions. Synthesis needs the claims, and SciSpace works at the claim level: cited answers, PDF chat to interrogate a specific study, extraction into comparison tables so patterns across methods and findings become visible, then a cited draft in the same workspace.
Value for money
The two tools are priced for different kinds of work: Connected Papers prices one instrument, SciSpace prices a workspace that answers, reads, extracts and writes. Pick on the job you need, not the headline number.
| Plans (monthly) | | |
|---|---|---|
| Free | 5 graphs per month, all features included | Basic — 100 monthly credits, Lite model access |
| Entry paid | Academic — $6/mo billed $72 annually, unlimited graphs, for academics, non-profits and personal use | Premium — $20/mo, 1,200 monthly credits, Pro model access |
| Higher tier | Business — $20/mo, unlimited graphs, for business and industry | Advanced — $90/mo, 10,000 monthly credits, Pro & Expert model access |
| Top tier | — | Max — $200/mo, 40,000 monthly credits |
