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Build vs. buy, explained Not opinion pieces — everything here is checked against the actual register: 200+ real SaaS apps, each with a verdict, a buildability score, and the reasoning behind it.
5 Things You Should Never Vibe Code (And Why) Five categories where this register's answer is always the same, not because it's hard, but because of who bears the risk when it's wrong. Real examples. The 90/10 Rule for Build vs. Buy: We Checked the Data The 90/10 rule says buy 90% of your software, build 10%. We checked it against 200+ real apps with real buildability scores. The real split isn't 90/10. How to Write a Build Prompt an AI Agent Can Use The difference between a vague prompt and a usable one, shown with a real before-and-after from this register's own history, not a made-up example. How Much Does It Cost to Build a SaaS With AI? Real numbers from 173 reviewed apps: what an AI agent build actually costs in agent usage and hosting, not a guess. MVP Scope: What to Build First (and What to Cut) The single most common reason a vibe-coded weekend project fails isn't the code — it's scope. Every idea on this register splits its build into an MVP and a v2 for exactly this reason. SaaS Apps With Real Moats: 5 Reasons to Just Pay Every JUST PAY verdict on this register has a specific, different reason — not just 'it's hard.' Five real categories of moat, with real examples. AI Coding Agents: Subscription vs. Pay-Per-Use The two ways to pay for an AI coding agent lead to genuinely different decisions about what's worth building. Here's the actual tradeoff, not a tool recommendation. The Vibe Coding Stack: What to Actually Use The same handful of tools show up in almost every build prompt on this register. Here's what they are and why, including where this site itself draws the line at 'just use this instead.' What Is Vibe Coding? A Practical Definition Vibe coding means describing what you want in plain English and letting an AI agent write the code — here's what it actually looks like, and where it genuinely works. 