At the moment, there are two pricing plans available for purchasing Overflow: "Pro" and "Enterprise". Here are the features in Pro.
There are monthly and yearly billing cycles. Prices start from $14.95/ seat/ month, billed yearly.
When purchasing an Overflow subscription, you're entitled to use the Desktop app (for macOS or Windows), Overflow Cloud for sharing, have unlimited product updates, unlimited documents, 1GB sharing to Overflow Cloud, and email and community support.
Overflow Publication links can be accessed by anyone that has the link without the need for a subscription. Comment-only accounts created by reviewers are free.
In the Enterprise plan, you get all the above, plus:
Unlimited Cloud Storage per Project
Advanced Security Permissions
Single Sign On (SSO) / SAML
Upgrade to any number of users
Check out our Enterprise page for more details.