Numbr is a versatile Chrome add-on developed by Anton Medvedev. It combines the functionality of a smart calculator with that of a notepad. This free program is categorized under Browsers, specifically under Add-ons & Tools.

Numbr's main feature is its ability to perform calculations with ease. It can handle prices in various currencies and can even convert between different currencies. Additionally, Numbr can provide cryptocurrency rates, making it a valuable tool for those involved in digital currencies.

The program's interface is visually appealing, making it enjoyable to use. With Numbr, users can effortlessly input expressions such as "$100 in EUR + 25%" and receive accurate results.

Overall, Numbr is a convenient and efficient tool for anyone in need of a smart calculator and notepad. Its ability to work with different currencies and provide cryptocurrency rates sets it apart from other similar programs.