Currently, parts of the cloudBit™ hardware, firmware and software system are open source and available under the GNU General Public License v3 (GPL-3). Parts are closed for the sake of security of our users.
We strive to strike the right balance between open and closed so that we give as much as we can to our community while meeting our business objectives and maintaining the security of our products.
In the meantime, the cloudBit™ does have an open API, enabling powerful customization! You can find our API documentation here.