Solo is fine. You don't need a co-founder. Yes in many cases a good co-founder will help your company succeed.. but in many other cases a bad co-founder will most certainly help it fail.
If you haven't already identified one then you can forget about it. The question is moot. You don't want one anyway. That's obvious. What you want is someone who will work for you at a discount, a coder who likes the product and the tech you're using and likes to get his/her hands dirty. A lot of people are just happy to have good work and some input into what they think will be a good product.. that would free you up to focus more on the marketing business side of things which is just as if not more important than that product itself.
If you haven't already identified one then you can forget about it. The question is moot. You don't want one anyway. That's obvious. What you want is someone who will work for you at a discount, a coder who likes the product and the tech you're using and likes to get his/her hands dirty. A lot of people are just happy to have good work and some input into what they think will be a good product.. that would free you up to focus more on the marketing business side of things which is just as if not more important than that product itself.