Set a daily reminder
A once-a-day nudge to log, at a time you pick, and what to check if it stops arriving.
Carlo can send you one notification a day reminding you to log. You choose the time. It is a nudge rather than a report, and it never tells you what you spent.
Carlo offers it once during setup. If you said Maybe later, or you want to change the time, open the More menu from the tray, tap Settings, then Notifications, and find Daily reminder. Turn it on and use the − and + buttons to move the time in fifteen-minute steps.
It arrives every day whether or not you have logged anything, as a standing invitation rather than a check on you. If you have already logged, ignore it. Turning it off stops it immediately and changes nothing else.
If it is not arriving, the usual cause is that notifications are switched off for Carlo in your phone's own settings, which the toggle inside Carlo cannot override. When that is the case the Notifications screen says so and gives you an Open Settings button that takes you straight there. A Focus mode or Do Not Disturb will also hold it back until you turn that off.