This took a mountain of work. Not just coding, but driving around, bugging friends to test it out, etc.

I even did an initial launch a 1.5 years ago:

1. I got 1000 users at roughly $2.5 (ad spend) per download so its something people cared about 2. 70% of my users would open the app once a day to check for open parking 3. My app only picked up parking 10% of the time, meaning from my 1000 users, I only got 100 spots a day

Ultimately item 3 killed my launch, 10% was too low a rate. Users would open the app and wouldn't see any spots. They slowly dropped off.

Instead of giving up, I continued working on it. Since then, I did major changes to the algorithm and reached a parking detection rate of 40%. This means 400 spots from 1000 users per day. This could result in 3-8 spots showing up anytime users open the app--which would finally make it useful. Personally, I can see this catching on.

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Anyway, I recently met someone who is pretty smart. I'm a tech guy, he's a data-science/marketing guy, but just one of those overall sharp people that could wear multiple hats. He's also got a lot of good credentials. He's a bit arrogant but that's ok--we work well together.

He and I discussed him joining as a co-founder and applying to YC. Initially my hard limit was 30%, but he wants 40%. I'm conflicted now. On one hand, I want a very smart, potentially game-changing cofounder. On the other hand, I feel my 3.5 years of hard work mean something, and I should have a significantly larger piece of the pie because of that.

What is an equity split that would make sense?