Wikibase, Wikidata, and Knowledge Graphs

Harness the Power of Wikibase and Knowledge Graphs to Drive Your Organization’s Knowledge Management.

Wikibase logo


Semantic MediaWiki logo


MediaWiki logo

Knowledge Graphs

Our Services

Use our Wikibase and Knowledge Graph expertise

Evolving Data Models

Knowledge Base Hosting

We Provide Wikibase Hosting, Semantic MediaWiki Hosting and MediaWiki Hosting. You can get both cloud hosting and on-premises hosting.

Collaborative Knowledge Bases

Software Development

We create custom knowledge base solutions for our clients, leveraging our deep expertise in graph-based knowledge management and software development. We also create Wikibase extensions and AI integrations.

Rich Data Relationship

Knowledge Management Consulting

Supercharge your Knowledge Management projects with our expert input.

Flexible Knowledge Bases

Managing your data effectively is the key to unlocking its potential. Our expertise in graph-based knowledge management systems, like Wikibase, provides the foundation for dynamic and interconnected knowledge bases.

  • Evolving Data Models Gone are the days of rigid schemas. Graph-based knowledge bases allow you to rapidly prototype and to adjust your schemas as your business evolves. Ensure your knowledge management system remains perfectly aligned with your organizational needs.
  • Collaborative Knowledge Bases Break down information silos and escape document hell. Store both rich text and structured data in a single knowledge base.
  • Rich Data Relationships Unleash the power of connected data, enabling deeper insights and smarter decision-making. Qualify statements, record historical data, add references, and supercharge your AI systems with your knowledge graph.

Wikidata and Wikibase

Wikidata is the free and open knowledge base that integrates with Wikipedia.
It holds over a hundred million items which combined contain billions of qualified statements.

Wikidata, the free knowledge base powered by Wikibase

Wikibase is the free and customizable knowledge base that drives Wikidata. It is well suited for setting up data archives that interoperate with the semantic web via open standards. This makes it popular with GLAM institutions, research communities and open knowledge advocates. Companies and enterprises have also found Wikibase useful to create flexible internal knowledge bases.

We provide Wikibase Software Development, Wikibase Hosting, and Wikibase AI integration services.

Contact us

Why Professional Wiki?

We are the world’s foremost Wikibase experts. A bold claim that we can back up.

Our CEO is the primary developer behind Wikibase and has been involved since the beginning, before Wikidata was even launched. Since then, we helped many organizations adopt Wikibase, creating several public Wikibase extensions in the process. We have also implemented or advised on the creation of Wikibase-like internal knowledge bases for large enterprises.

We also have experience with integrating AI into knowledge bases and with graph databases like Neo4j, Blazegraph, and Amazon Neptune.

We Have Helped

Professional Wiki has helped a wide range of organizations with their Wikibase and knowledge base needs.
From cultural institutions to large enterprises, we have the expertise to assist you.

Below are some of the organizations that we publicly helped adopt Wikibase.

German National Library

We are working with the German National Library on their structured authority data, to increase accessibility and interoperability. This makes Wikibase attractive to the ~1000 institutions using the GND.


We have completed various projects for Wikimedia. This includes creation of Wikidata and Wikibase themselves, contributions to MediaWiki core and the development of MediaWiki extensions.


Rhizome champions digital art and culture. We created the popular Wikibase Local Media extension for Rhizome. The Rhizome Wikibase uses our Chameleon theme.

Ministry Of Culture

We are helping the Luxembourg Ministry of Culture adopt Wikibase. This includes Wikibase hosting and the development of the Wikibase EDTF and Automated Values extensions.

Kunstenpunt Flanders

Kunstenpunt is the Flemish center for visual arts, performing arts, and classical music. We host the Kunstenpunt Wikibase and provide Wikibase Consulting.

Kunstmuseum The Hague

We upgraded and are now managing the Wikibase of The Hangue Kunstmuseum. This includes QuickStatements, the Wikibase Query Service, Lua, and more.

Customer Testimonials

"Professional Wiki provided Rhizome with competent and timely custom development work. Making use of all the tools that are available to open source developers today, the team built extensions that follow modern software design guidelines, are easy to install, configure, and maintain, and include good documentation and automated testing. Quite unique in the Mediawiki space!"
Profile picture
Dragan Espenschied / Preservation Director, Rhizome
"I had the pleasure to work with Jeroen at Wikimedia Deutschland. Jeroen is one of the most productive and passionate developers that I know. Without Jeroen, Wikidata would not have such a rich range of functions and would be built on a less flexible, lower-quality codebase and architecture. Jeroen has in-depth knowledge and broad experience about clean code and software architectures. I have always appreciated his professional attitude, collegial and reliable manner. He is an absolute win for any team and project!"
Profile picture
Abraham Taherivand / Executive Director, Wikimedia Deutschland
"Jeroen is Technical Director at Professional Wiki. Jeroen was working on Semantic MediaWiki and was one of the original developers on Wikibase at Wikimedia Deutschland. I had the pleasure of working with Jeroen for many years and have rarely found someone as dedicated as him towards the quality of the software he is working on."
Profile picture
Denny Vrandečić / Head of Special Projects, Wikimedia Foundation
"We were lucky to have had multiple opportunities to work with Professional Wiki and were consistently impressed by their expertise and commitment to quality. They deliver outstanding results and provide back to the open source community. Professional Wiki is professional, knowledgeable, and dedicated to delivering top-notch software. Their passion and experience in software architecture and clean code are evident in every project they take on. We highly recommend Professional Wiki for any project in the Mediawiki/Wikibase space."
IP Squared and Digital Werktuig on Automated Values and Wikibase EDTF


We can provide high-level advice on architecture and product levels. For instance, we can help you understand the strengths and limitations of MediaWiki and Wikibase. We can evaluate plans from first principles, considering both the user and technical concerns. We push for simplicity, sustainability, and user experience.

We can also help you with anything technical related to Wikibase, MediaWiki, or graph databases, including software development not directly tied to either software.

Contact us

Wikibase Hosting

Create your Wikibase with a few clicks via our Wikibase cloud hosting.
Or contact us for tailored Wikibase hosting, including on-premises hosting.

Enjoy our Wikibase Dashboard and Admin Panel via our Wikibase hosting options.

Wikidata, the free knowledge base powered by Wikibase

Want to get started with Wikibase? Do you have questions?

Contact us

Knowledge Base AI

Wikidata Logo

In the post-ChatGPT world, AI integration into your Knowledge Base is often a must.

Supercharge the creation and curation of your knowledge with writing assistants, automatic summaries, natural language queries, and more.

Improve your AI chatbots and other AI tools by giving them access to your knowledge base. Provide context to LLMs with Retrieval Augmented Generation or teach your AI tools how to run efficient and deterministic queries directly against your graph database.

Learn More