The cost of building an app like Tinder can vary significantly depending on a wide range of factors. The total cost will depend on your specific requirements, such as the features and functionalities you want to include, the platforms you want to support (iOS, Android, web), the complexity of the design, and the development rates of the professionals or agency you hire. Here are some key factors that can influence the cost:

Features and Functionality: Tinder has various features like user profiles, swiping, messaging, geolocation, social media integration, and more. The more features you want, the higher the cost.

Platform: Developing for multiple platforms (iOS, Android, web) will increase costs. Cross-platform development frameworks may help reduce this.

Design: The complexity and quality of the user interface and design can impact costs.

Geographical Location: The rates of development teams and agencies vary by location. Developers in North America and Europe typically charge more than those in Asia, for example.

Testing and Quality Assurance: Rigorous testing and QA are essential for a dating app, and this can add to the cost.

Server and Infrastructure: Costs for hosting, data storage, and maintaining servers.

Regulatory Compliance: Legal and regulatory compliance can add expenses, especially in dating apps.

Maintenance and Updates: Ongoing maintenance, updates, and support should be factored in.

Marketing and Launch: The cost of marketing and launching the app to attract users.

As a rough estimate, building a dating app like Tinder can cost anywhere from $10,000 to $15,000 or more, depending on the factors mentioned. It's essential to create a detailed project plan and budget with the help of a development team or agency. Keep in mind that ongoing costs for maintenance, updates, and server hosting will also be part of the total cost.