The free version is mainly just a number of user and device limit. Although the relaying service might be limited as well, but that should only matter if both of your clients have strict NAT, otherwise the Wireguard tunnels gets directly connected and no traffic goes through Netbirds managed servers.
You can also self-host the control plane with pretty much no limitations, and I believe you no longer need SSO (which increased the complexity a lot for homelab setups).
The free version is mainly just a number of user and device limit. Although the relaying service might be limited as well, but that should only matter if both of your clients have strict NAT, otherwise the Wireguard tunnels gets directly connected and no traffic goes through Netbirds managed servers.
You can also self-host the control plane with pretty much no limitations, and I believe you no longer need SSO (which increased the complexity a lot for homelab setups).