TagInfo is an Android app made by a chip manufacturing company called NXP. It does a decent job of determining the type of chip it’s talking to and fully scanning any accessible memory into a scan report. It also makes sharing information gathered easy, which makes diagnosing problems or answering questions about specific NFC tags one might have much more efficient.
ANDROID TagInfo - https://play.google.com/store/apps/details?id=com.nxp.taginfolite&hl=en
IPHONE TagInfo - https://apps.apple.com/us/app/nfc-taginfo-by-nxp/id1246143596
Do note that iOS has some serious limitations still when it comes to NFC commands and communicating with tags, so TagInfo is far less informative on iOS than Android.