An interesting question. Some apps have colored icons. Perhaps icons as an alternative to denote type might be a good addition. While looking at a list, would such make identifying habits easier? Unsure. As for color, my instinct is that colors to denote individual habits or habit types is less useful than something else. Various apps, including once Habitify, use or used color to denote state. Once there was completions (was it?) denoted by colors of I believe blue, light blue, and orange. I’d lean towards that, such as if the circle or completed checkbox (as part of a circle graph like weekly progress?) denoted habit success. E.g., if one was doing well this week and on track for the week, blue, if one was slightly behind, light blue, or if one was way behind, orange, such that if as the week progresses one was on track to 100% (excellent), 80% (good), or 60% (poor), for example, one could easily such. Better than a single color as now in weekly progress? Maybe.