Creating Free and Pro Themes — a practical guide to WordPress freemium theme with clear examples you can reuse in real projects.
WordPress Theme Development Series (86/96). Prefer one article? Read the complete WordPress theme development tutorial.
Short description
Keep free themes useful. Put advanced features in a pro plugin/upsell when possible.
Freemium tips
Free: solid design + core templates
Pro: extra patterns, demos, premium support
Never lock user content behind license