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DeFacto: Deep Fact Validation

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A Fact-Validation framework

DeFacto is a framework for validating statements by finding confirming sources for it. It takes a statement (such as “Jamaica Inn was directed by Alfred Hitchcock”) as input and then tries to find evidence for the truth of that statement by searching for information in the web (more information).

How to cite

  title = {DeFacto - Temporal and Multilingual Deep Fact Validation},
  author = {Gerber, Daniel and Esteves, Diego and Lehmann, Jens and B{\"u}hmann, Lorenz and 
           Usbeck, Ricardo and {Ngonga Ngomo}, Axel-Cyrille and Speck, Ren{\'e}},
  journal = {Web Semantics: Science, Services and Agents on the World Wide Web},
  year = {2015},
  url = {}
 title = {Toward Veracity Assessment in RDF Knowledge Bases: An Exploratory Analysis},
 author = {Esteves, Diego and Rula, Anisa and Reddy, Aniketh Janardhan and Lehmann, Jens},
 journal = {J. Data and Information Quality},
 year = {2018},
 url = {},
 publisher = {ACM}
  • ☕️ Java version
  • 🐍 Python version (🔥 coming soon ❗️)


Found a 🐛 bug? Open an issue


  • v2.1

    • HTTP service support
  • v2.0

    • Multilingual Deep Fact Validation Feature
  • v1.0

    • No support for http service

    • Vaadin component required (user interface)

    • Uses FactBench v1.0