Which invoice management tool do you use?

I am aware there are plenty of options out there, but to be honest in my opinion they are either expensive or ugly or too complex for a freelance or small company. I would like to know what you use, why you use it and what would be your ideal tool? I was thinking that I’d love a simple saas, cheap that has great design and that has the essential features and nothing else 🤷‍♂️ What do you think? Looking forward to hear you!