Ask HN: How much of your product/project is your own code?

With all the wonderful apps and services out there that have been made or are in the works, it'd be interesting to know how much was built by hand and how much was built on pre-existing code. Did you build it from the ground up or use other services? While the use of other services will most likely be the case for things such as digital delivery and payment processing (be sure to include those though), perhaps there will be a few surprises.