Hey Alok B. great question. first of all those 2 should not even been compared. because Appollo is primarily a data provider and email sequencer tool whereas Clay is much much more than that, besides yes it has the ability to also provide access to email and phone number data through either an API connection to your existing data provider (could be Appollo or others you currently pay for) OR directly provide you access to various data provider built within Clay such as fullenrich, Findymail and many others.
Clay is much more of an orchestrating tool acting as a connective tissue between your entire makreting and tool stack to create end-to-end AI-powered workflows. This removes the typical silos and bottlenecks to create a much more flawless execution. It's a game changer.
Does that help?