Cointracking and Kucoin – safe?

Does anyone else use Cointracking for their Kucoin trades? I have been using the Blockfolio app but it’s just too basic, and I like the look of Cointracking… but as I’ve just found out, Kucoin don’t give API permissions and “All keys have full access to your funds” – can I trust they really don’t save anything? Am I being paranoid and this is a non issue and safe? Any input appreciated