The question is really just how big of a market does this serve? You've made it to the point where anyone entering the FIRE market will likely stumble upon your product as a top recommended tool (just judging by the praise here). Maybe it can tap into the larger, but more generic, financial/retirement planning market. To me, it seems well on it's path to be a YNAB which has a high amount of word of mouth recommendations, but perhaps covers a larger market.