String Calculator is a free Chrome add-on developed by Oleg.Samusenko. This powerful tool allows users to easily calculate math expressions with included comments. Whether you need to perform simple calculations or complex equations, String Calculator has got you covered.

To use String Calculator, simply type 'sc' followed by your expression in the browser's address bar to open it in a new tab. The add-on supports a wide range of symbols including comma, period, plus, minus, division, multiplication, and parentheses. This makes it easy to input and calculate even the most intricate math expressions.

With String Calculator, you can also include comments in your expressions to provide additional context or explanation. For example, you can input '(2 apples * 5 days) * 30 people = 300' to calculate the total quantity in a given scenario.

Overall, String Calculator is a convenient and efficient tool for anyone who frequently works with math expressions. Its user-friendly interface and support for various symbols make it a valuable addition to any Chrome browser.