To be honest, more than being different, APIs and microservices can be considered 'complementary.' Your business's web app can utilize both to function most efficiently. With microservices as the application's building block and APIs as the communication enabler, your app will have a long way to go. With this, you will be able to manage and scale your app's services separately, increasing the solution's efficiency multifold. If you need an industry expert to get the job done, then leverage the expertise of a top-rated Microservices development services provider.