Seek cofounder before or after building a prototype?
What's the right time to bring them in? I'm currently in the prototype building stage. If I bring cofounders in now, they get to contribute vision, help speed it up. However, I also run the risk of not showing them a complete enough product to convince them to join me. They may decide to pass me up, or worse - take my ideas and build it themselves!
If I wait till a bit later (e.g. after launching a beta), I can make a better pitch to potential cofounders, and also ensure I maintain a lead. However, they will feel like "employees" instead of cofounders, since my personal vision is so baked into the product.
So, what's a better time to seek cofounders? Any suggestions on timing greatly appreciated.
Thanks!