OPT One vs Drupal

OPT One
$129 one-time / user
  • No extra cost per site
  • $6/mo per extra collaborator
  • Hosting billed by your provider
Drupal
Free software
  • Hosting: $25–500+/mo
  • Modules/support: $50–500+/mo
  • Implementation: $10k–100k+
  • Ongoing maintenance: $500–5,000+/mo

Drupal can be "free" and still cost more than a paid product when the complexity isn't required.