How I Replaced $3,000/Year of SaaS With 50 Lines of Code - Building FeatureDrop

How I Replaced $3,000/Year of SaaS With 50 Lines of Code Every SaaS product eventually needs the same thing: a way to tell users about new features. A "New" badge. A changelog popup. A guided tour for complex flows. The standard playbook is to buy a third-party tool, embed a script tag, and configure it through a dashboard. It works. But it also costs $50–600/month, ships 100–300 kB of JavaScript to your users, and locks your feature data in someone else's database. I decided to see how much of that I could replace with a library. The answer turned out to be: all of it. The Core Insight Product adoption tools are fundamentally simple at the data layer. Every one of them does the same thing: features[] → isNew(featureId) → render UI A list of features with dates and metadata. A function that checks whether a specific feature is "new" to the current user. And a set of UI components that react to that state. The complexity lives in the vendor dashboard, the analytics pipeline, and the bil