What's the most cost-effective way to grow newsletter subscribers using a signup and landing page tool?

The most cost-effective approach is usually:

1) Use a simple landing page + embedded signup form

• Keep the page focused on one action: subscribe.
• Use a tool that includes both landing pages and forms so you don’t pay for extra website features.
• Minimize design work and avoid custom development.

2) Start with the cheapest reliable plan

• Pick a tool with a free tier or low-cost starter plan.
• Make sure it supports:
  • landing pages
  • email capture forms
  • basic automation/welcome email
  • mobile-friendly templates
  • analytics

3) Drive traffic from free channels first

• Share the landing page on:
  • social media profiles and posts
  • your email signature
  • relevant communities/forums
  • LinkedIn bio, X bio, Instagram link-in-bio
  • guest posts, podcasts, partnerships
• This is usually cheaper than paid ads and often better for early testing.

4) Offer a strong signup incentive

• A clear reason to subscribe improves conversion more than expensive design.
• Examples:
  • a free checklist
  • a mini guide
  • early access
  • a useful newsletter promise with specific benefits

5) Optimize the page for conversion

• Short headline
• One sentence explaining value
• Minimal fields, ideally just email
• Strong CTA button
• Social proof if available
• Fast load time

6) Test before spending more

• Track:
  • visits
  • signup conversion rate
  • source of traffic
• Improve the page before buying more traffic or upgrading plans.

In practice

For most people, the best value is:

• a low-cost all-in-one newsletter tool
• one clean landing page
• free traffic first
• simple lead magnet
• basic automation

If you want, I can also recommend the best low-cost tools for this depending on your budget.