💥 How do you split a product between Co-Founders?

There are so many different parts, inputs, and efforts that founders put into building a product.

I'm sure everyone is doing their best to achieve the best result.

But I'm curious:

When you're building a product together, how do you divide it between co-founders?

Is it 50/50? , 60/40? , 70/30?..

Does everyone own their own part?

Or do you somehow measure the value of each contribution and split accordingly?

What counts as a more valuable part of building a product?

Development? Product vision? Design? Architecture? Or something else?..

I'd really love to hear how other co-founders approach this.

How do you split your product between co-founders?

What's your measure?