Travel apps are one of the most popular download categories in the world. At least 60% of smartphone users have downloaded at least one travel-related app, and 55% of consumers in this market research multiple sources before booking a trip. Global demand for online travel apps is set to exceed $1.1 billion in 2022 with an annual CAGR of 11.1%, according to the latest research. In the US, online travel sales - which include airlines, hotels, car bookings - are currently worth $198bn, with around 40% of that coming through mobile devices. Customers are increasingly happy to book big ticket items, such as hotels through apps, making the user experience more important than ever. So, with the growing popularity and increasing market, a tourism startup can be very successful, especially in some narrow niches.