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As is often the case with young languages, the question has been asked of the Clojure Community "Who's using Clojure?"

This page intends to answer that question!

If you would like to get your story on this page, send an email with a brief (one paragraph) description of how you've used Clojure to Optionally, send along an image and a link that we can post alongside the description.



Akamai has created a digital operating environment for the Web. Our global platform of thousands of specially-equipped servers helps the Internet withstand the crush of daily requests for rich, dynamic, and interactive content, transactions, and applications. When delivering on these requests, Akamai detects and avoids Internet problem spots and vulnerabilities, to ensure Websites perform optimally, media and software download flawlessly, and applications perform reliably.

Appvise was founded in December, 2010. It aims to connect your smartphone with the apps you will love. It is a marketplace where you get personalized lists based on who you are, what you’re interested in, where you live and what your friends are like.

BackType is a marketing intelligence company that develops products and services that help companies understand their social impact. BackType has built the most powerful system in the world to analyze social data. We also power social features for over 100 companies including The New York Times, SlideShare, Automattic (creators of WordPress), Bitly and more.

Brand Karma's mission is to protect the value and cultivate the potential of brands. We provide the smartest technologies to interpret brand data and expert consultants to guide hospitality executives in the world of new media. Brand Karma clients are able to compete analytically and achieve a superior return on their brand investments by increasing awareness, satisfaction, loyalty, and profitability.

Citigroup, the leading global financial services company, has approximately 200 million customer accounts and does business in more than 140 countries. Through Citicorp and Citi Holdings, Citi provides consumers, corporations, governments and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management.

Compass Labs enables advertisers to reach, engage and convert users on Facebook, Twitter and other social networks across the web, including mobile, using our intelligent, precision-targeted optimization.

Factual, Inc. is an open data platform for application developers that leverages large scale aggregation and community exchange. For example, you will find datasets for millions of U.S. and International local businesses and points of interest, as well as datasets on entertainment, health, and education. We've been using Clojure for over a year now as part of our real time aggregation and query stack. We've begun using it more aggressively to help us solve large scale data problems, including leveraging the power of the Cascalog project.

FlightCaster predicts flight delays. We use an advanced algorithm that scours data on every domestic flight for the past 10-years and matches it to real-time conditions. We help you evaluate alternative options and help connect you to the right person to make the change.

Geni is solving the problem of genealogy by inviting the world to build the definitive online family tree. Using the basic free service at, users add and invite their relatives to join their family tree, which Geni compares to other trees. Matching trees are then merged into the single world family tree, which currently contains nearly 50 million living users and their ancestors. Pay services include enhanced research tools as well as keepsake products created from family tree data. Geni welcomes casual genealogists and experts who wish to discover new relatives and stay in touch with family. Geni is privately held and based in Los Angeles, California.


Higiebus is a solution addressing the need to replace paper handling by electronic content between medical organizations. It's a focal point for internal traffic between services in hospitals and is also designed as a remote interconnect between different organizations.
It's based on a message bus design with off the shelf interfaces for various medical equipment/computer systems. Totally redundant and geared to deliver messages in real time. It's been used in production since January 2009 initially with a pre v1.0 Clojure runtime.

Infinitely Beta are a very passionate team of hackers and product designers who believe that the best products share the DNA of simplicity, aesthetics and function. We apply great technology to deliver very simple and usable product experiences. We are laser focused on the less obvious aspects of great products such as performance, low latency and scalability.


KamaGames is a successful developer and publisher of entertainment software for the MacOS, Android, Samsung Bada, Facebook and other social networks since 2009.
We work with developers from China, India, Russia, United States, Canada and New Zealand. Organizing chaos we achieve unique results in game development. Giving shining moments to the our customers in shared time with products of our genius.
Today we connected with 8 millions people. Tomorrow our family grow up at least 10 times.

LeadTune makes products that help you reduce lead waste and get more from your leads.

The Computational Biology Group at the Max Planck Institute for Molecular Biomedicine is developing computer tools to understand the mechanism underlying genetic regulatory networks of toti-, pluripotential stem cells and reprogrammed cells.
We employ Clojure to analyze and visualize gigabytes of genomic data.

Pico Quantitative Trading is an agency-only broker that specializes in providing services to multi-asset electronic trading clients.
The PQT℠ team offers expert assistance in low latency trading needs ranging from client coverage to technology development along with market structure, stock loan, clearing, and co-location trading.

Platogo provides tools and APIs for game developers to bring their games to Facebook and other social networks easily. Our last product, helps social application developers maximize their revenue by integrating the world's most relevant social networks through a unified social graph interface. As of today (Jul/2011) we are using clojure 1.3.0.

Relevance is using Clojure to help our customers solve wicked problems. We have deployed Clojure-based solutions for startups, medium-sized businesses and Fortune 50 customers. We've built home health tracking tools, real-time network security analytics, and online game engines. We've used Clojure to further academic research and build a Facebook application. Clojure represents a sizable, and growing, portion of both our team and our project pipeline.

Revelytix uses semantic web technologies to build products for data integration and emergent analytics in enterprises and federal systems. The company's flagship project uses Revelytix technologies to integrate many data sources in one of the largest federal domains and provide analytics for key decision-makers. Revelytix has three products built entirely in Clojure: Spyder (for dynamic SPARQL to SQL translation using R2RML mappings), Spinner (for SPARQL federation), and Rex (for RIF-based rule execution). These three products are all at their core about symbolic manipulation of queries, ontologies, or rules and we have found Clojure to be an excellent match for those problems. Clojure allows us to build high-level abstractions that work at the level of the problem. We also have gotten tremendous gains from being able to integrate with and reuse the vast wealth of Java libraries available on the JVM.

Runa helps to deliver more effective personalized sale price incentives in real-time.

Setere offers two basic types of solutions - solutions for companies and organizations, ensures efficient of information security and solutions for software companies associated with IS, allowing these companies to apply innovative technology companies Security Technology Research in its products.

Sonian is a technology platform and hosted services company on a mission to help millions of organizations world-wide manage their critical IT functions such as archiving, search, compliance, e-discovery and storage management. Sonian deploys large clusters running Clojure to perform parsing, archival, and indexing of many terabytes of email and other documents.

TheDeadline provides a novel way to share todos fast and easy with co-workers to collaborate in small and large projects. An integrated Artificial Intelligence system gives status updates, asks for decisions and provides a smart system to re-submit overdue todos without annoying the user. The tool does not just store todos, but actually helps users to get their todos done: Adding and tagging a todo is as easy as writing a Twitter post.

Typewire is a live-blogging service that lets you communicate with your entire audience instantly as you cover live events.

We use a combination of Clojure, ClojureQL and Vaadin to make our website at We have found that we can develop much faster than using traditional Java, JSP and Servlets, partly because Vaadin is such a good web framework but also in great part due to Clojure's seamless interoperability with Java. The most beneficial aspect for us is Clojure's STM and Lisp abstractions however.

WeatherBill’s unique technology platform enables the real-time pricing and purchasing of customizable weather insurance using proprietary global weather simulation modeling and local weather monitoring systems. We protect the $3 trillion global agriculture industry from the financial impact of adverse weather – the cause of over 90% of crop loss – with fully automated weather insurance products. Our technology platform also powers, an automated weather insurance program for travelers worldwide. We use Clojure extensively under the hood for Cascalog flavored Hadoop jobs and building RESTful services.

World Singles is a company dedicated to helping people meet, connect, and find love. We operate a cohesive portfolio of culturally focused dating brands catering to various ethnic and lifestyle communities, as well as those seeking a more diverse, world-centric dating experience.

What are we using Clojure for?

In our newly launched dating platform, we're currently using Clojure 1.3.0 (Alpha 8) in the Model layer to handle persistence (based on, logging (, with custom log4j appenders written in Clojure) and "environment control" (managing per-tier application settings automatically). We're just starting down the path of using MongoDB for several new pieces of the platform and we'll be doing all that from Clojure too. Over time, I expect more and more of our Model layer to be developed in Clojure...

Discover news about your interests, your neighborhood, and the world.

Wusoup is a web-based meeting application being built entirely in Clojure: front and back ends. Nginx acts as a reverse proxy, passing requests to the application running an embedded Jetty (Ring) server. Routing is handled by Compojure; HTML generation by Hiccup. The algorithmic stuff is mostly cached map reductions over user profiles and statistics collected from user behaviour. was one of the first production web sites built on Clojure. It was also one of the first open-source legal research databases, reported in the New York Times. AltLaw used Clojure to leverage large open-source Java libraries such as Hadoop, Lucene, and Solr. AltLaw has since shut down, but it helped to inspire other organizations, such as Google Scholar, to make more legal documents freely available and searchable.