Building a podcast app involves several key steps, including planning, design, development, and testing. Start by defining core features such as user profiles, podcast streaming, download options, and social sharing. Essential features might include search functionality, recommendations, and playlist creation. The cost can vary widely, typically ranging from $20,000 to $100,000, depending on complexity and developer rates. A common tech stack includes React Native or Flutter for the front end, Node.js for the back end, and cloud services like AWS for storage and streaming.