Free ways to detect WiFi channel of surrounding networks?

I’m attempting to get rid of some WiFi interference. I believe that since I live in a trailer park I may be having some channel interference. We only have one internet provider for this area and well, I’m sure you guys get the issue lol. So I’m looking for a free website or app that I can use this one time to scan the area for WiFi channels this way I can configure my R8000 router for the channel less used.