The Hello Expense Android app looks nice and basic for easy input as you go, but it would be nice if they included at least some basic categories pre-loaded. Things like "Hotel", "Rental Car", "Lunch", "Breakfast", "Dinner", "Gas", "Airfare", "Local Transportation", "Office Supplies", "Business Meal", etc would be logical to come pre-loaded.
I understand the desire to be customizable to match personal needs or corporate policies, but not having ANY preloaded categories (that could be deleted after downloaded if needed) makes it harder to test after initial download and might put many folks off from actually using it.