Different studies offer varying assessments of how many people use dating sites and apps, but what we can say with certainty is: a lot. In Match.com’s annual Singles in America Survey, which polls more than 5,000 people who are not Match users, the company found that the No. 1 place where singles meet is online. In 2016, Pew reported that 27 percent of people aged 18 to 24 had used a dating app or site. In 2013, it was 10 percent. The proportion of 55- to 64-year-olds in the same category doubled.

“An average person spends about three hours a day on their mobile phone,” said Lexi Sydow, a market insights manager at AppAnnie. “Dating apps are really tapping into that.” Ms. Sydow noted that global consumer spending for dating apps, or the amount of money users pay for add-ons, subscriptions, memberships and other features, has nearly doubled from a year ago.

Even traditional matchmaking services are wading in. “I used to be a matchmaker before this,” said Meredith Davis, the head of communications for the League, a dating app that has a screening process for where you went to school, where you work (and have worked), how many degrees you have and other social-status categories. “Matchmakers are now overseeing their clients’ dating app accounts.”

With so many people using the internet to find the One (for life, for tonight or for next week), more niche options have popped up, too. Take, for example, FarmersOnly.com, a website that, contrary to its name, is not just for farmers, but does court users who understand “country living,” as Jerry Miller, the site’s founder, put it.