Does my restaurant need its own app, or is a website enough?

For most restaurants a website is enough. Customers order in the browser with nothing to install, and can add it to their Home Screen so it opens like an app.

• On iPhone, add any website to the Home Screen from Safari's Share menu. With a web app manifest it opens like an app.
• Since iOS 16.4, web apps added to the Home Screen can send push notifications, after the customer taps to allow them.
• App cost: Apple Developer Program is US$99 a year. Google Play is a one-time US$25.
• Apple can reject an app that is just a repackaged website, so it needs real features.