Free tool as viral lead magnet
Build a small, free standalone tool that solves a real problem to attract massive signups and feed your paid funnel.
Why this can grow a startup
A useful free tool earns organic backlinks, ranks well on search engines, and gets shared in communities. Users experience your brand's quality firsthand, lowering trust barriers. The tool acts as a top-of-funnel magnet while the core product handles monetization. It creates a B2B viral loop where each user who shares the tool brings in more potential customers.
Company example
HubSpot — free tools like Website Grader and Email Signature Generator drive millions of visits and convert a portion into CRM customers.
Source and metric
Source: posthog.com · Browse posthog.com tactics
Source discovered: March 19, 2026
When to use it
Use this when Referrals, SEO is relevant to 10K+ and you can run a bounded test with a free budget.
When not to use it
Do not use it as a substitute for customer evidence, a clear owner, or a measurable stop condition. Local platform rules and market behavior still need checking.
Founder checklist
- Read posthog.com and identify what is directly supported.
- Choose one channel context: Referrals, SEO.
- Define the test around one observable customer behavior.
- Set an owner, evidence window, and stop condition before launch.
Explore the context
Apply this with an operator
Turn isolated search tactics into a crawlable visibility system tied to demand and proof.