I've been building this on nights and weekends for about a year, next to paid work. It went live on Sunday evening and three people have paid for it since. Small number. Still felt like something, given the whole waitlist before launch was 41 people. The thing itself: every FIRE and retirement calculator I ever used assumes you stay in one place. You give it a savings rate, it gives you a year, done. That assumption is wrong for anyone who moves. My burn rate in Chiang Mai and my burn rate in ...