I keep an eye on quiet SaaS tools that grow through word of mouth. A few stand out. Kuse turns messy files into clean documents and hit ten million ARR with no marketing. Gamma grew to two billion valuation with a tiny team by nailing the first thirty seconds. Cursor let developers adopt it bottom up, no ads needed. The pattern is simple. Solve one specific problem, make onboarding effortless, and let the product speak for itself.