Plugging In the Business Model
After the product definition is written, one sentence is still missing: why this thing deserves to keep existing. Without an answer, what you build can only sit on your own machine.
What you will run into
- 东西做完了，才开始想怎么收钱，发现哪儿都不好加
- 加了付费墙，用户直接流失，因为免费版已经把事办完了
- 想做订阅，但用户一个月只用一次，续费理由说不出口
A common thought is "build the product well first, and once there are enough users we'll figure out how to make money." That holds under one condition — you can last until the users show up. Solo, you usually can't.
How It Reshapes the Product
The same note-taking product, under three different ways of charging, becomes three different things.
| 收钱方式 | 产品要证明什么 | 于是结构上会长出什么 |
|---|---|---|
| 订阅 | 这个月我依然在帮你 | 周报、使用统计、持续更新的内容。首页要能一眼看到累积价值 |
| 买断 | 这一次就值这个价 | 功能完整度是卖点，不需要留人。可以做到「用完即走」 |
| 广告 | 有很多人在这里待很久 | 信息流、推荐、无限滚动。跟「帮用户快速办完事」直接冲突 |
| 按用量 | 你用得越多，得到的越多 | 用量要看得见，还要有额度提醒。AI 产品多数走这条 |
The Free / Paid Line
If you're running a freemium model, where this line sits is life or death. The two ways to get it wrong are exactly opposite each other.
免费：无限条目、全部核心功能
付费：换皮肤、导出 PDF
事情已经办完了，没人有理由付钱
免费：只能存 3 条，处处是锁
付费：正常使用
还没体会到价值就被拦住，直接走人
免费版能把一件事完整做完一次，付费解决的是量、协作、或者省时间
比如免费能整理一个项目，付费才能同时管十个并自动归档