Smart Tools Box - Stopwatch is all in one app with Text-to-Speech, Stopwatch, Age Calculator, Unit Converter, QR Code Generator, Image Compressor, and Area Converter in a single app. It is the best Text to Speech app which can convert Text to voice as it is the best text to speak app also. It contains a stopwatch timer to count your activity time. The age calculator calculates your current age in year and lets you know how old are you because it's the best age checker. Unit Converter is a conve