As its name clearly states, Uno Calculator is, well, a calculator app. Regardless of how good calculator apps are, it's somewhat difficult to get excited about them.

However, in the case of Uno Calculator, I think a bit of excitement is warranted. For starters, Uno Calculator is actually the open-source Windows Calculator app, but it has received the cross-platform "treatment" from Uno Platform.

This means that Uno Calculator brings the Windows Calculator app to a wide range of platforms including Linux, macOS, as well as Android and iOS, and even the web (thanks to WebAssembly). If you want to see just how well a 30-year-old code runs on a modern system, this is your chance.

The whole point of the Uno Platform is to run apps on a wide range of platforms while still delivering native performance and a "pixel-perfect UI" experience.

In the case of Uno calculator, this is spot on. The app boasts three types of "calculator modes:" Standard, Scientific, and Programmer. The design is the same as Windows 10/11, and the GUI (even on Linux) is remarkably responsive.

This responsiveness is thanks to SkiaSharp (or Skia, for short). Skia is a modern cross-platform 2D graphics API (for .NET platforms) and is known for its fast drawing times and high performance.

Other than that, you also get a ton of unit converters such as a Weight Unit converter, a Temperature converter, a Pressure converter, Angle converters, and a lot more.

As mentioned before, Uno Calculator is also available on other platforms. For me, the most interesting aspect (besides the fact that it works really well on Linux) is that the app has also been ported to iOS and Android. This is possible thanks to technologies such as Xamarin.iOS and Xamarin.Droid alongside Lokless Controls to run XAML and C# on both platforms.