Similarly, when Daniel Rubin, a 31-year-old criminal defense lawyer in Los Angeles, was proposing to Nikki Rubin, 26, who is studying to be a speech pathologist, he knew Tinder had to be part of the equation. “We were always known in our friendship circle as the longest lasting relationship to meet on Tinder, and we wanted to embrace that,” Mr. Rubin said. “We wouldn’t have even met if it wasn’t for the app.”

So he asked the company if he could pop the question in their West Hollywood, Calif., headquarters.

He told Ms. Rubin he had to look at office space for a friend. The doors opened, and she saw a huge sign with their Tinder profile pictures and the heart sign signifying a match. “This was the last thing I could have expected,” she said. “It was super original, creative, and cool. It’s so much part of our identity.”

For this couple, their friends and family understood how much they value their online dating provider. “When we tell them our engagement story, people always respond with, ‘Oh man, I need to get on Tinder,’” Mr. Rubin said.

Ms. Walsh, however, remembers her finance’s grandparents being very confused about why a random person from a corporation was getting a prime spot on the guest list. “They just didn’t understand it,” she said. “They thought it was meant for family and friends, and why would we invite strangers? It took a lot of convincing on our end. We had to explain that we just feel very, very connected to them, and we have so much gratitude.”