This is an endlessly useful pair of apps for those of us who work in electronics. Here is the website These Apps are one of those apps that when you check it has what you were looking for, even if you, at first were not sure. The section on the Raspberry Pi was a big help when I got my first one. The Pro version is a one time payment of $6.99 I would gladly pay more it is that good.
electronic-toolbox.com
Electronic Toolbox 2 - Electronic Toolbox
Discover Electronic Toolbox, your go-to reference and calculation resource for professionals, hobbyists, HAMs, and students. Access essential tools for electronics, RF, and circuit design, all in one app.
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