Any Privacy-Respecting Coin Portfolio Services?

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So if you've read the important parts of the privacy policies for services such as Coinmarketcap and Coin Gecko, you probably know they are able to use and sell every bit of information you give them for nearly any purpose they see fit.

I have a particular distaste for companies that are willing to share data for the right price. Not caring who they sell it to.

Are there any privacy-focused portfolio trackers? I only hold bitcoin, but using a calculator is getting a bit old.

These don't have to be web services. An open-source program would be fantastic as well.