When it comes to developing a grocery delivery app, you need an app development team to work on your project. Make sure you are hiring industry experts or a modern-equipped mobile app development company to ensure a tested and smoother grocery delivery app like Instacart. The average estimation for your app like grocery delivery will go around the US $40k to the US $50k. But this is just a rough estimate, you need to consult your project with an expert mobile app development company to figure out the exact cost.