A new startup or MVP should consider using SEO (Search Engine Optimization) software as soon as they have a basic understanding of their target audience and have developed content or a website. Implementing SEO early on can help increase visibility and drive organic traffic to their platform or product. However, it's important to note that SEO is an ongoing process, and while some basic optimization can be done at the outset, more advanced SEO strategies may be implemented as the startup grows and matures. Therefore, investing in SEO software early can provide valuable insights and tools to optimize content, keywords, and website structure for better search engine rankings and overall visibility.