Tinder will update your location and check for matches around you only when you open the app and start swiping. In short, if a persons location changes, they have been on the app.
How can you tell if someones Tinder is active?
Use Tinders Recently Active Feature “The only way to know if someone you know is on Tinder is if you stumbled across their profile,” a Tinder spokesperson tells Elite Daily. This is probably for your own good.
What does the green dot on Tinder messages mean?
recently active Tinder introduced the green dot as a way of demonstrating if a user has been recently active or not. If the user has a green dot next to their name, it means they have been online and active in the last 24 hours.