Do you use a tool/app/document/etc. to organize the process of validating your idea, estimating market size, confirming product/market fit, etc.? If so, what? How satisfied are you with it?<p>If not, why not?
It used to be possible to do this with Google Trends, but they removed the number of searches and the y-axis is along the lines of 100% popularity now.<p>Otherwise I just compare to competitor products to see if the market is sizeable. I've done analysis before with a cofounder and things like keyword popularity also helps, but in the end it doesn't really do knowing that there's a huge market for "jobs for teens" sites unless you want to make a product for that.