Fin is an online guide for people planning dive and snorkel adventures around the world. It helps underwater explorers discover sites and compare practical details, including depth, marine life, and skill level, so they can find experiences suited to their interests. Visitors can browse destinations across 177 countries, explore sites by activity, and use map and satellite views with filters to narrow their search.

The platform also features marine-life information, covering groups such as fish, sharks, rays, corals, turtles, mammals, and other species. For those seeking local support, Fin provides a directory of dive centres across 197 countries, helping users connect with certified centres and professional instructors. The site brings destination discovery, species profiles, dive-site planning, and centre listings together in one resource.

Its data is sourced from OBIS, NOAA, and more than 20 published sources. Fin also offers an app for underwater explorers, with options to sign up or log in and links for users to connect with the company