NetBox is an Open Source product and free to use On-Premises through the NetBox Open Source Community. You can learn more about NetBox here.
NetBox Cloud is a managed solution where NetBox is hosted by NetBox Labs on your behalf. This can substantially reduce the time, energy, money, and resources needed to scale and maintain your NetBox instances. NetBox Cloud is not available for free… but we do have a really nifty free trial! Get in touch!