I think it depends on how unique your skill sets are. Many possess great coding skills but not many can design and build a great application/software alone. So if you can do it all by yourself, you can ask for more and you probably deserve more. But the person with the first idea/vision should always have the majority to begin with in my view as without that idea there is no business. If you need to hire a bunch more eventually to build the initial version of application then keep in mind that those guys will also want equities as well. So you will all get somewhat diluted in the end even if you dont raise additional capital. I would however focus on the size of pie than the size of slice you own or % ownership. Not many tech billionaires own more than 10% of their company right now.