That depends, check out our Bases section. The Nack Desk has pre-drilled mounts for IKEA plates and our Sit-to-Stand Frame and can work with many other frames and legs.
The Nack Desk was designed to be compatible with many 3rd party off-the-shelf legs and leg systems. For example, IKEA provides a wealth of leg options as well as many others.
We intend to offer our own series of legs but they aren't quite ready.