Safari on iOS kind of has devtools, but they're not available on the go, since you still need a desktop computer to access them. Enable the "web inspector" sett

Safari on iOS kind of has devtools, but they're not available on the go, since you still need a desktop computer to access them. Enable the "web inspector" setting in iOS safari and the "show develop menu" in macOS (both in the advanced settings section). When you plug in the iOS device directly into the Mac, it'll show up in the Mac's Safari's develop menu. Unfortunately, this is completely useless if you don't have access to a mac or are away from your computer.