The 19 channels

Engineering as marketing

Build a free tool people already search for. The best channel for someone who can code.

What it is

One of the 19 traction channels: free tools, calculators and micro-apps used as an acquisition surface. S3 S12 Documented examples include HubSpot’s Website Grader, launched in 2008 and still drawing around 65,000 visits a month, Shopify’s business name generator, Remove.bg, and Ahrefs’ free keyword generator, which requires no signup. S12

When it works

When you solve one specific problem the audience already searches for, minimise friction with no mandatory signup, and make the tool demonstrate the value of the paid product. S12 It is a loop rather than a funnel: the tool earns links, links earn rankings, rankings bring users, some of whom link to the tool. S7 S12

What it needs from the product

Engineering time, which a builder has, rather than spend, which a builder does not. There is no prerequisite on the site because you build the surface.

How it decays

Returns compound slowly through backlinks and rankings, so it is slow to start. S12 Once it works, it is subject to the same search intermediation as everything else. S23

What the report checks

No gate can fail. It is the highest-weighted channel in the report for a solo operator because it converts the hours you have into the distribution you do not.

Sources

  1. S3 Growth Method, "19 traction channels for growth marketers" secondary source
  2. S12 Growth Method, "Engineering as Marketing" secondary source
  3. S7 Reforge, "Growth Loops are the New Funnels"
  4. S23 Search Engine Land, "Mastering generative engine optimization in 2026"