You can now make Preview Deployments private for free, across all plans.
Shareable Links: Share private Preview Deployments with external collaborators without the need to log in. See docs for limits.
Vercel Authentication: Team members can log in with their Vercel account to access secure previews.
Password Protection is now Advanced Deployment Protection and keeps the same price at $150/mo. Pro and Enterprise customers can add on Advanced Deployment Protection, which includes:
Private Production Deployments: Make your production deployment private with the click of a button.
Protection Bypass for Automation: Allows you to bypass user authentication by using header secret for automated tooling.
Password Protection: Secure preview and production deployments with a password.
Enterprise customers will also have access to audit logs allowing them to track who generated a given Sharable Link at what time and from which device.
Check out the documentation to learn more.