Dartscounter - Darts At Double & Darts To Checkout clarification

Using dartscounter for online play, can anyone provid clarification to the above 2 prompts when it asked you,

I know the how many darts at double is purely how many darts thrown at the double when trying to check out, so say you needed 23, you hit S3, miss D10 then hit D10, thats 2 darts at double

But what would you put for Darts to Checkout? would it be 3 darts, as you hit S3, missed D10, then hit it, or do you not count missed darts on how many darts to checkout?

would it be 2 darts tocheckout, for the S3 and then D10, not including the missed D10?

Thanks!