Wolfram Alpha

OK, Wolfram Alpha is not really a search engine. Rather, it is called a computational mechanism that generates output data by calculating the input data that was fed to it.

So, why is it here? Well, if you tend to use Google for simple calculations and transformations, there comes a time when the giant simply can't meet your needs anymore. That's when you turn to Wolfram Alpha.

If you need to calculate the diameter or area of a circle, square, or something else, it will be easier for Wolfram|Alpha. You can use it to solve difficult homework from school, perform calculations for your design project and much more.

The engine is free for non-commercial use. But it also offers a $5.49 Pro plan with additional features and a $9.99 Premium plan with even more features.

Features: AI-based computing engine

Cons: Not a clean search engine

Website: wolframalpha.com