I'm a solo dev. Reflecting on my own career, I noticed a pattern I repeat every few years - in hindsight obvious, but in the moment it just feels like a normal decision. The knowing was never the problem; recalling it at the right time was. So I built Vernoly . You build up a personal "codex" of your own principles, and before a real decision the app surfaces the ones that apply - including when two of them disagree ("finish what you start" vs. "cut losses early"...