4DD is the official mobile app for 4 Design Days 2026, the 10th anniversary edition of the architecture and design industry event in Poland. 4 Design Days 2026 will take place on January 22-23, 2026, at the International Congress Center in Katowice.

The app makes it easy to participate in the event:
- a detailed agenda with the ability to create your own schedule
- a built-in instant messenger for networking with other attendees
- full profiles of speakers and experts
- access to live streams and session recordings
- news and notifications

Install the app, plan your attendance, and stay up to date with the program.