This is a personal project born from the need to have a good (free and open-source) units convertor on my phone (hence the UI; I now use it as a Cordova app).
The short story is that there was a time when I was converting from inches to centimeters very often, and the tool that I used for doing so was a simple DuckDuckGo search like this: "5 inch to cm". I got tiered of that and thought "It would be great to have the GNU units cli on my phone, but with some nice interface". Turned out that was possible using WebAssembly. This is the results.
I've added some bells and whistles, like the option to be able to save certain units calculations as calculators. The data for the order and the deletion/creation of the calculators is stored in the browser using Local Storage.
The source code for the project can be found here:
https://github.com/yanosh-k/units-wasm
https://github.com/yanosh-k/gnu-wasmunits