90 秒，四个问题，先告诉你这个想法最先卡在哪一层——不是给你打分，是告诉你哪一层会先判它出局。Four questions. 90 seconds. Find out which layer kills your idea first — not a score, but the exact gate it fails.
答完只跑最便宜、也最能一次判死的四层：买方能不能锁定 → 你起不起步 → 盘子够不够大 → 首年真能落到你手里多少。 全部在浏览器本地计算，不上传、不留存、不注册。It only runs the four cheapest and most decisive gates: is the buyer definable → can you even start → is the market big enough → how much actually reaches you in year one. Everything is computed in your browser. Nothing is uploaded, stored, or required to sign up.
先说清楚它不是什么。它不会告诉你"这个想法好不好"。市面上已经有足够多免费工具做那件事了。它只回答一件事：如果你现在开始做，第一道拦住你的墙在哪、那道墙有多高。First, what this is not. It will not tell you whether your idea is "good" — plenty of free tools already do that. It answers exactly one thing: if you start now, which wall stops you first, and how high is it.
四个问题The four questions
前三个各填一句，第四个勾选。都不需要查资料——写你脑子里的那个答案就行，那个答案本身就是体检对象。First three are one line each; the fourth is a checkbox. No research needed — write what's already in your head. That answer is what we are testing.