Building a calorie tracker: what would make you actually use one every day?

I’m relaunching my calorie tracking app next week after rebuilding a big part of it.

Before I launch, I want to ask the people who actually use these products:

What would make you choose one calorie tracker and stick with it for 6+ months?

Curious about what matters most: speed, accuracy, simplicity, personalization, motivation, something else?

I’d rather build around real answers than assumptions.