Comment by moosedev

Without taking anything away from OP's achievement, I'd caution against this kind of exuberant comparison without some qualification around it. The risks to that app's continuing to yield $500/month in perpetuity are quite different (and, I dare say, worse) than the risks faced by the kind of balanced portfolio that "safe withdrawal rate" implies (to me). I acknowledge that you didn't directly compare with such a portfolio, but you did say the app is "the equivalent of saving $150,000" - again, if this is true it's in a very limited sense only: the app and the cash face a very different set of risks.