Semantic Scholar records 8,198,672 monthly visits with +5.8% month-over-month growth and Free pricing. Serpex records 2,405 monthly visits with -34.3% growth and Freemium, Free Trial, Paid pricing.
A free, AI-powered academic search engine for 240M+ papers across every scientific field
Affordable real-time search API that returns structured JSON plus page content in a single call.
| Dimension / Metric | | |
|---|---|---|
| Official Domain | semanticscholar.org | serpex.dev |
| Pricing Model | Free | Freemium, Free Trial, Paid |
| Monthly Visits | 8.2M (8,198,672) | 2.41K (2,405) |
| MoM Traffic Delta | +450.65K (+5.8%) | -1.26K (-34.3%) |
| Primary Market & Share | 🇺🇸 United States (22.9%) | 🇮🇳 India (91.3%) |
| Direct Visits / mo | 1.88M | 936 |
| User Rating | 4.8 | 4.3 |
| Supported Platforms | Website | Website |
A free, AI-powered academic search engine for 240M+ papers across every scientific field
Search 241 million-plus publications from every scientific field using natural-language queries that match meaning rather than exact keywords.
Each indexed paper gets a one-sentence machine-generated TLDR so you can triage results before committing to reading the full text.
An augmented PDF reader that highlights citations, definitions, equations and figures inline, and shows which later papers cited the passage you are reading.
See how a paper was cited, whether citations were influential, and which references shaped the work — useful for literature reviews and citation chasing.
Affordable real-time search API that returns structured JSON plus page content in a single call.
Send a query and receive live web results as clean, structured JSON that is ready for parsing, ranking or feeding into a model.
Convert any URL into clean, readable markdown in the same API key, removing boilerplate so retrieved text is directly usable for RAG and summarization.
Requests are routed across multiple underlying search sources with health monitoring and automatic retries, so a single empty source does not break your pipeline.
Official libraries and snippets for Python, JavaScript, MCP and LangChain make it a few lines of code to add live search to an agent or app.
SpecialistBroader real-time web search capabilities with academic filters, but less specialized for deep bibliographic citation analysis than Semantic Scholar.
SpecialistBroader real-time web search capabilities with academic filters, but less specialized for deep bibliographic citation analysis than Semantic Scholar.
Synthesizes direct evidence-based answers from scientific papers, but has a less comprehensive raw database than Semantic Scholar.
Synthesizes direct evidence-based answers from scientific papers, but has a less comprehensive raw database than Semantic Scholar.
Offers an immersive AI reading and PDF analysis workspace, but is less focused on pure bibliographic search.
Offers an immersive AI reading and PDF analysis workspace, but is less focused on pure bibliographic search.
Free / Open-sourceWeb data API that turns any site into clean, AI-ready content
Free / Open-sourceWeb data API that turns any site into clean, AI-ready content
Excels at automated systematic review data extraction and evidence synthesis, but indexes a narrower slice of literature.
Excels at automated systematic review data extraction and evidence synthesis, but indexes a narrower slice of literature.
One API key for agent-grade web search, fetch, browsing and automation
Web search API and crawler built for AI agents
SpecialistProvides advanced Smart Citations showing how papers support or dispute each other, but has a smaller overall index.
SpecialistProvides advanced Smart Citations showing how papers support or dispute each other, but has a smaller overall index.
SpecialistFeatures excellent visual citation collections and literature tracking recommendations, but lacks inline paper summarization features.
SpecialistFeatures excellent visual citation collections and literature tracking recommendations, but lacks inline paper summarization features.
Real-time search engine scraping API with structured JSON, HTML, or Markdown output
Real-time search engine scraping API with structured JSON, HTML, or Markdown output
SpecialistOffers superior visual graph mapping of academic paper connections, but lacks traditional keyword search and full-text reading tools.
SpecialistOffers superior visual graph mapping of academic paper connections, but lacks traditional keyword search and full-text reading tools.
AI-native workspace for literature reviews and auditable systematic reviews
AI-native workspace for literature reviews and auditable systematic reviews
