Board Thread:General Discussion/@comment-46819185-20201023005002/@comment-168424-20201026180504

If you have an iOS or iPadOS device, the OS version is in Settings &rarr; General &rarr; About.

If you got your browser from the App Store and it is not Safari, its version will be in the page about it on the App Store under the heading "What's New". The Safari version is tied to the OS, so it isn't as important to know.