Ocean of Papers vs Connected Papers
Honest comparison of Ocean of Papers and Connected Papers in 2026: features, data sources, free limits, pricing and who should pick which. Includes a free citation map you can try now.
Quick answer
Connected Papers builds one polished similarity graph from a seed paper using Semantic Scholar data, with 5 free graphs a month. Ocean of Papers combines multi-source search (8 databases), free open-access PDFs and a citation map with Similar, Prior and Cited-by modes. Pick Connected Papers for its mature similarity graph and multi-origin graphs; pick Ocean of Papers if you start from a topic, want PDFs in the same place, or need monthly billing.
At a glance
Both tools help you see the neighborhood around a paper instead of scrolling a flat list. They differ in where they start and what surrounds the graph.
Connected Papers analyzes on the order of ~50,000 papers per graph and arranges the strongest few dozen by co-citation and bibliographic coupling, using the Semantic Scholar corpus (about). It also lists Prior Works and Derivative Works and supports multi-origin graphs.
Ocean of Papers starts from search across OpenAlex, PubMed, arXiv, bioRxiv, medRxiv, Europe PMC, Semantic Scholar and Crossref, links free open-access PDFs, and lets you build a citation map from any result in three modes: Similar, Prior (references) and Cited by.
| Feature | Connected Papers | Ocean of Papers |
|---|---|---|
| Data sources | Semantic Scholar | 8 sources (OpenAlex, PubMed, arXiv, bioRxiv, medRxiv, Europe PMC, Semantic Scholar, Crossref) |
| Start from a keyword search | Paper search only | Yes |
| Similarity graph | Mature co-citation + coupling graph | Similar mode |
| Prior / derivative works | Aggregated lists for the whole graph | Prior and Cited-by map modes |
| Multi-origin graphs | Yes | No |
| Free open-access PDF links | Open-access filter | One-click OA PDFs |
| Table and Swipe triage views | No | Yes |
| Projects / library | Saved papers, graph history | Projects, folders, library |
| Mobile-optimized | Not tested | Yes |
| New-paper alerts | No | No |
| Free tier | 5 graphs / month | 5 new maps / month, unlimited search |
| Paid | $6/mo Academic, $20/mo Business (billed yearly, US list) | $9/mo or $79/yr; ₹299 / ₹2,499 in India |
| Monthly billing | No (yearly or quarterly) | Yes |
Where Connected Papers wins
- Graph quality and maturity. The similarity layout is well tuned and widely trusted in academia.
- Multi-origin graphs. You can add a second origin and rebuild around both papers. Ocean of Papers does not offer this yet.
- Aggregated Prior and Derivative Works lists across the whole graph, sortable by citations and graph links.
- Distribution. It is integrated into arXiv abstract pages via arXivLabs (arXiv blog), so many researchers already know it.
Where Ocean of Papers wins
- You don't need a seed paper. Search a topic across 8 databases, then map the best result.
- Fresh preprints. bioRxiv, medRxiv and arXiv are searched directly.
- Free PDFs in the same flow. Open-access links sit next to every result and every map node.
- Triage views. Table view for scanning metadata and Swipe mode for fast keep/skip decisions.
- Mobile. The search, map (bottom-sheet details) and library work on phones.
- Billing flexibility. Monthly plans, cancel anytime, plus local India pricing.
Pricing compared
Connected Papers: free tier includes all features with 5 graphs per month. Academic is listed at $6/month and Business at $20/month when billed yearly (US list prices, $72 and $240 per year); group seats cost the same per seat and library licenses are quoted. Billing is yearly or quarterly, and prices can vary by country. Source: connectedpapers.com/pricing, checked October 11, 2026.
Ocean of Papers: Free: search, open-access PDFs and 5 new citation maps per month. Pro: unlimited maps for $9/month or $79/year (₹299/month or ₹2,499/year in India), cancel anytime. See pricing.
Who should pick which
- Pick Connected Papers if you already have the key paper, want the most established similarity graph, or need multi-origin graphs today.
- Pick Ocean of Papers if you begin with a question rather than a paper, want PDFs and the map in one place, work on mobile, or prefer monthly billing.
- Use both if you like: find and read papers in Ocean of Papers, then cross-check a key seed in Connected Papers.
See also: Ocean of Papers vs ResearchRabbit, vs Litmaps, and our full literature mapping tools comparison.
FAQ
Is there a free alternative to Connected Papers?
Yes. Ocean of Papers lets you search 8 databases, open free PDFs and build 5 new citation maps per month for free, with no account. Inciteful and Open Knowledge Maps are also free tools with different approaches.
How many free graphs does Connected Papers allow?
Connected Papers' free tier allows 5 graphs per month with all features included, according to its pricing page. Paid Academic and Business plans remove the limit.
Does Ocean of Papers use the same data as Connected Papers?
Not exactly. Connected Papers uses the Semantic Scholar corpus. Ocean of Papers searches OpenAlex, PubMed, arXiv, bioRxiv, medRxiv, Europe PMC, Semantic Scholar and Crossref, and builds maps mainly from OpenAlex citation data.
Can Ocean of Papers build multi-origin graphs like Connected Papers?
Not yet. You can make any node the new origin and rebuild the map, but combining two origins in one graph is a Connected Papers feature Ocean of Papers does not currently have.
Which is cheaper?
Connected Papers' yearly Academic plan ($72/year US list) is cheaper than Ocean of Papers Pro yearly ($79). Ocean of Papers offers monthly billing ($9) and India pricing (₹299/month), which Connected Papers does not list.
Related guides
- Ocean of Papers vs ResearchRabbit
- Ocean of Papers vs Litmaps
- Best literature mapping tools compared
- Free literature mapping tool (citation maps)
Search free research papers · Build a citation map from any search result · All literature tool comparisons