A startup development company is exactly what it sounds like: A company that helps your startup grow. Obviously, your software product is going to be a big part of this. However, it is not the only thing that you should focus on. Apart from building up your product, these agencies are usually capable to provide assistance when it comes to marketing and growth. This can be anything from inbound marketing to testing a new product with your audience. Furthermore, startup growth agencies are also well-connected in the industry and will be able to recommend third parties that you might need to work with.