The Love Calculator API is a free, fun, and easy-to-use compatibility application that can be used by matchmaking services or social networks to build engaging content features into their websites or mobile applications. The API provides a simple form where the name of two people can be input for a simple analysis of compatibility that is output to an endpoint results page. The algorithm behind the processing was developed by Ajith Joseph, and the code generates a form that can be auto-populated with two names. Submission of the form leads to an API call that returns the percentage of success of the relationship between the two people. Developers can use their choice of programming language to customize the display of the endpoint results using CSS, HTML, or JavaScript. The Love Calculator API is one of the most popular services on RapidAPI, earning a 9.6 out of 10 ranking, with a latency of 626 ms and 98% uptime. It allows web publishers to build unique content on their websites that will attract and entertain users.