[gnyman]

I do think Soulver would be a better choice for many. But it is much more powerful, allowing you to do conversions and labels.

So the simplicity of just having two calculators side by side and a fast way to transfer the results is probably exactly what some people need and want. Zero learning curve, just two calculators doing exactly what you expect.

I'm always fascinated by apps and programs that does exactly one thing, but does it really well (sometimes referred to as the Unix Philosophy). I feel it's harder to find tools and apps like these nowadays. Not sure if there are less or if they are just harder to find because of the huge number of apps overall.

[Edit] Writing this comment actually reminded me of this blog https://onethingwell.org/ which highlights software like this. Gonna try to contact the author and see if they want to add this one :-)