Project Haystack: The leading tagging standard to unlock the value of data

It’s like finding a needle in a Haystack

The Internet of Things (IoT) allows any device, system or buildings to produce data. Yet, remarkably, the language of that data is not yet standardized. Sometimes, trying to find the right way to communicate between devices or systems can be a challenge.

Project Haystack is an open-source initiative, which seeks to standardize the way semantic tagging and data-modelling is used in smart buildings, for various applications including HVAC, power management, lighting, shading, metering, fire detection, security, access control, CCTV, water leak detection, space management, asset management etc.

For the greater good

The not-for-profit corporation was founded by Siemens, J2 Innovations, A Siemens Company, among others, with the purpose of fostering the common association of technology companies developing data for smart buildings and smart devices.

Clear benefits

By standardizing semantic data models and web services, it becomes much easier to unlock value from the vast quantity of data being generated by our smart devices. And as the leading, most widely deployed tagging standard, Project Haystack offers clear benefits. Active working groups are also extending the scope of the definitions to cover additional data types.


Utilizing technology that implements Haystack tagging ensures:

  • Comprehensive dictionary definitions for HVAC, metering and other building related data making it cost -effective to analyze, visualize and derive value form data
  • Future-proofing the analytics and management of buildings and data for years to come and position them ready for the smart buildings of the future
  • Project Haystack also defines an open protocol over REST
  • Haystack 4 now supports data-modelling, with a methodology for taxonomies and ontologies

Further reading