Lead magnets should improve over time.

Metrics to track:

• Opt-in rate: Visitors to subscribers (aim for 25-50%)
• Download rate: Subscribers who actually open it
• Engagement: Do they reply, click, or share?
• Conversion to paid: Ultimate measure of quality

Optimization tests:

• Different titles and formats
• Landing page copy variations
• CTA button text and color
• Adding or removing form fields

A 10% improvement in opt-in rate compounds forever.