If you've developed it to the point of product and seed funding, then you can justify holding out equity pretty easily. I would suggest that you offer a third.

If you've developed it to the point of product and seed funding, then you can justify holding out equity pretty easily. I would suggest that you offer a third. You need to be generous because if they're going to be a co-founder then you're going to need them to have a honest stake in the company otherwise they won't take it seriously. It might suck because you feel that you did all the work, but you're going to need a long term view. I had a hard time accepting this in my past experience partnering with people so the venture eventually failed.