Can someone recommend a FOSS HTML Color Code app for Android?

I’m looking for a FOSS HTML color code app for Android that will allow me to find the codes for specific colors, like this website does on web. I also looking for an app that doesn’t require the Google Play Store.

I use an Android phone with no Google Play Store account, and so far every color code app I downloaded it from the Aurora Store, immediately tried to open Google Play Store when I try to use it. I don’t know why.

Would appreciate your assistance.

Image Toolbox?

Correct me if I’m wrong, but Image Toolbox’s color picker will tell you the color code in the image that you select. Although that is great feature, that is not what I am seeking to do. What I am seeking to do is to find the color code for the color I want to choose.

For example, I use Notesnook, the E2EE note-taking app. When you want to write text in color in NN, you can type the HTML color code. So if I want to type in yellow, I go to the HTML color code website I mentioned above, select yellow, copy the color code for it, and type it in Notebook. I want a color code app that does the exact same thing as that website.