I made a
googlesheet with which you can check whether your deck is legal or not.
I did not allow you to edit the sheet so no deck codes are being posted in there for everyone to see, to use it simply make a copy and paste your deckcode in "Upgrades Calculator" cell A1.
It only accounts for free upgrades if you actually use them, so if you are at max upgrades but have unupgraded free upgrades you can do so and it should show that the deck is still legal.
I entered values manually, if a number of upgrades seems inaccurate pls report it to me.
It omits the last card code in the deck (which would normally be the code of your deck mark), so be sure to include the full deck code.