This project is unique. While some calculators already exist, most are very basic. The one breed crossing that does exist is not well detailed and does not contain the range of breeds and colors that ours will. Even reading the native Dutch program, I can tell it is not as detailed as this project can be.I'm open to adding it to BYC, but would have to determine what it would require / cost to get it developed, and try to gauge how much interest would be out there. Also, we'd need to make sure we were creating something that was uniquely interesting and valuable / helpful compared to all the other options that are already out there.
Earlier in this thread, I believe there was discussion around creating a "proof of concept"... like in Excel / Google sheets or similar? That way it could be fleshed-out before doing a full-on web development.
I don't think it will cost much to get it developed, not enough to charge users.
There is some proof of concept excel sheets. One of wish I wrote myself.