Folio vs Litmaps
Visual citation-graph exploration and per-map alerts vs. a research agent that ranks against your library.
Litmaps builds a visual citation map from one or more seed papers — showing what they cite, what cites them, and co-authorship links — and its Monitor feature can turn that map into a standing alert, emailing you when new work cites your seeds. Folio's Discovery Agents and Radar solve a related but different problem: instead of a map you seed and monitor by hand, they scan on a schedule, rank what they find against your own library and stated interests, and deliver a digest explaining why each result was kept.
Where Litmaps shines
- A genuinely useful, free way to visualize how a body of literature connects — citing/cited-by and co-authorship links, drawn from a broad open corpus (Semantic Scholar, OpenAlex and Crossref, 270M+ articles).
- Monitor turns any existing map into a standing alert, emailing you when new work cites your seed papers, with no separate search to maintain.
- Free tier covers real exploration — 2 maps with up to 100 articles each — enough for a first pass on a review before you'd need to upgrade.
What Folio adds
- Ranks new candidates against your library and stated interests, so what surfaces reflects work you actually keep — not just whatever cites the same seed paper.
- Queries the same open corpus Litmaps indexes (OpenAlex, Semantic Scholar and Crossref) and additionally hits arXiv, DOAJ and Europe PMC directly, then ranks what comes back against your library and attaches a one-line reason, instead of an unranked citing-paper alert.
- Delivers one digest across everything Radar found, instead of a per-map monitor you have to set up and check separately for each topic.
- Expands along the citation graph from recent papers already in your library — what they cite and what cites them — without you seeding or maintaining a map for it.
Which should you choose?
Choose Litmaps if you want to visually map how a set of papers cite and relate to each other, and get a simple alert when new work cites your seeds.
Choose Folio if you want new work ranked against your own library and interests, pulled from more than one source, with a reason attached — delivered as one digest instead of a graph and a per-map alert.
Frequently asked
Does Folio replace Litmaps?
Different jobs. Litmaps is best for visually mapping a citation network from seed papers and getting alerted when new work cites them; Discovery Agents and Radar are best for an ongoing, ranked digest of new work relevant to research you're already doing.
Where do Folio's Discovery Agents get their data, vs. Litmaps?
Overlapping, and honestly not that far apart. Litmaps builds its index from Semantic Scholar, OpenAlex and Crossref; Folio queries those three too, plus arXiv, DOAJ and Europe PMC directly, de-duplicating across all six. Much of what those extra three hold is already indexed by the first three, so treat the coverage difference as modest rather than decisive. The real difference is what happens next: Litmaps builds a citation graph and alerts on new citing papers per map; Folio ranks new candidates against your library and interests and explains why each one was kept.
Is this free like Litmaps?
Litmaps has a real free tier — 2 maps, up to 100 articles each. Radar and Discovery Agents are part of Folio's Fellow and Chair plans, so cost is a real tradeoff if you only need occasional citation mapping.
Try the whole chain in one place
Discovery, reading, citations, drafting, and integrity checks — free to start, no credit card.
Comparison reflects publicly available information as of September 2026; Litmaps is a trademark of its owner and is not affiliated with Folio. Tools evolve — spot something out of date? Tell us.