OPT One vs WordPress

OPT One
$129 one-time / user
  • No extra cost per site
  • $6/mo per extra collaborator
  • Hosting billed by your provider
WordPress
Free software
  • Hosting: $5–100+/mo
  • Plugins: $25–300+/mo
  • Security/backups: $15–100+/mo
  • WordPress.com: $4–45+/mo

WordPress the software is free. Running it is not. Total cost of ownership often exceeds the sticker price.