Which App To Create Logo?

Hi. There're such a variety of logos and logo styles available, it'd be hard to suggest something that'll cover all bases, but traditionally, Adobe Illustrator is used for logo creation. It's powerful, flexible, and by nature, it creates graphics that are infinitely resizable, so the logo can be used for the corner of a business envelope, and the side of a building without losing quality. It's definitely the place to start, in my opinion.