At $4.99, it's pricey for a to-do list, but the fact that specific lists (like the - ahem - "menu prep" list, or "grocery shopping" list) can be synced makes this my go-to list for menu-planning and grocery shopping.
I've had it for six months and used it myself or in sync with my husband at least once a day.
What does that have to do with personal finance? Food is one of your biggest bills, and we all know that shopping with a list and planning your meals are the best ways to save money on eating, right?