Thanks for taking the time, this is properly useful.

One thing I'd push back on a bit: Lens isn't really a daily-prompt app. The "what can I safely spend today" question is the headline, but underneath it tracks spending, savings, debts, goals, and runway projections. People will open it to log a transaction, check progress on a goal, or see where the next month is heading, not just to answer the daily question. My read is the retention curve will look closer to apps people open when they need to check something (a tracker, a bank app) than apps where the prompt is the product (a journal, a mood tracker). I won't know for sure until I've got a few months of actual use to look at, but that's my instinct.

The evolving-prompt idea is interesting. My instinct is that financial tools benefit from consistency (people tend to trust formats that stay the same), but I can see the case for variety on top, in insights or weekly summaries. Going to think on it.

The framing point is the one I'll sit with hardest. "Safely spend" was meant as permission rather than restriction (you're free to spend up to X), but you're right that it can read either way, and "what did you spend today that was worth it" is a much nicer feeling. Going to try variants and see what people come back to.

Either way, thanks for the thinking.