actually the site/documentation hasn't been updated but it's now free for 100 devices (with a price increase beyond).
from an email earlier this week:
"For new subscribers we've increased the price to $29.00/month (USD), but we've also increased the maximum number of devices for free accounts to 100.
We think this better reflects the difference between personal and business users, providing plenty of devices in our free version and charging enough for our business customers to justify adding new features and services and to support the continued development of the entire ZeroTier ecosystem."
from an email earlier this week:
"For new subscribers we've increased the price to $29.00/month (USD), but we've also increased the maximum number of devices for free accounts to 100.
We think this better reflects the difference between personal and business users, providing plenty of devices in our free version and charging enough for our business customers to justify adding new features and services and to support the continued development of the entire ZeroTier ecosystem."