HAT Apps

HAT Applications

The applications in MarketSquare are all built on the HAT, a private data account that lets users store their own personal data for themselves so that they have full control, access to, and ownership over it. HAT applications don’t use normal centralised databases to store their users’ data - they access it from these private data accounts instead.

Building a HAT Application

The HAT’s data infrastructure lets you build MVP applications quickly, without relying on much of a backend infrastructure, and they have a robust solution to standard cyber security and user authentication challenges built into them. Applications are easily built, certified, and added to MarketSquare.

Removing hurdles

One of the biggest challenges to building amazing consumer applications has been getting access to sensitive customer information. Rich, contextual customer information is almost impossible to acquire, and it gives incumbent industries a massive advantage. HAT Applications change all that, accessing users’ information at a centrally stored location that keeps the customer at the center of everything.

All new ideas

Ultimately, the promise of the HAT is that you can start to build the impossible. The HAT can generate valuable contextualised mixed data sets, owned and controlled by the user, that have previously only been partially available to corporations. Now they can be a part of your team’s applications as well.

A virtuous cycle of data exchange

If you’re a trusted HAT Application, you can use that data to create a whole new category of consumer technology - and best of all, your users will actually be the primary beneficiaries of that innovation, creating a virtuous cycle where they’re encouraged to share with you more.


HAT Applications are certified by the HAT Community Foundation, a members-run organisation that helps maintain the user-centric principles of HAT Applications and the companies that host and issue HATs to consumers. The applications that you build on the HAT will be certified by this group, and rated for how carefully you treat your users’ data.

The HAT Ecosystem

All of the HAT apps and services in MarketSquare, plus our partners at HAT Innovation, the team at HATDeX, and the academics who work with the HAT at HAT Research, form an ecosystem of businesses, customers, and partners that can greatly benefit you as an app builder. Every new service helps bring more data, and more users, into the ecosystem, making it easier and easier for you to scale.

Get help from HAT Innovation

As the digital economy begins to shift, HAT Innovation is committed to partnering with innovative new technologies and the organisations that support them in bringing about the new personal data economy. You can get funding, engineering support, advice, and insights from the HAT community by applying to join the HAT Innovation programme.

Go to HAT Innovation

Join the Developers’ Community

Still not sure what to build, or how to build it? Or do you have a brilliant idea, and are looking for advice from the people who built the HAT technology? Join the HAT Developers’ Community on Slack and build the applicationsof the future with our team of world-leading technologists.

Join us