Prompt-to-app tools are a third option worth naming. Lovable, Bolt (bolt.new), v0, and Replit turn a natural-language prompt into a running app in your browser. For a landing page, an internal tool, or a demo you need by Friday, they are fast. They also bill differently from a boilerplate: each is an AI generator on a monthly subscription plus usage credits (from roughly $25/mo), not a one-time license you buy once and keep.
The catch is the same one vibe coding from scratch hits, just earlier. These builders optimize for the first screenshot, not the twentieth feature. You usually get a polished front end without production-grade multi-tenant auth, subscription billing, background jobs, infrastructure-as-code, or a real test suite. Export the project and you own whatever the generator produced, with no shared conventions for the next prompt to follow. That is the same pattern drift, minus a versioned foundation.
A SaaS boilerplate solves the opposite half of the problem. It hands you an owned, version-controlled codebase with the security-critical pieces already built and a set of patterns AI tools extend instead of reinvent. The practical rule: use an AI app builder to explore an idea, then move to a boilerplate the moment that idea is worth maintaining.