Could we consider responsive a websites/platform as a substitute of a native app?

Let's say you have a company. You have a platform and an app. Does it make sense to have your platform responsive? I mean.. Could we consider apps and responsive platforms substitutes?

In some cases, giving to your customers the opportunity to reach your product from browser too while using their mobiles creates a better and more accessible experience for everybody. Can we consider having both them an experience enrichment?

Thank you!