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I'm surprised no one has mentioned Soulver yet (https://soulver.app/). I have used it for years -- it looks like it has pretty similar functionality to this but (IMO) with a more native-feeling UI. I love it.

I don't think it supports as wide a range of math, but it does seem to pass the accuracy test given in the article (sin(exp(37))). It also lets you assign variables which I find handy.

On the other hand, the propagation of uncertainty in Chalk is very cool.

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I haven't seen Soulver, but it looks very similiar to the one I use on Mac, called Numi. On Android, I use an app called CalcNote which works in a similiar way. Neither does graphing, but you can do common formulas and functions like cos/sin/rad. I use numi for simple calculations, and find it fantastic when I'm trying to figure out project stuff. A recent use is entering wall dimensions to figure out square footage and compare different building materials. I often leave most of my old calculations in numi like a long-lived numerical memory.

https://numi.app/

https://play.google.com/store/apps/details?id=com.burton999....

Thanks for the Android app recommendation, it's amazing! Basically numi on Android, love it!

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