I just launched iNat on my iPhone XS for the first time in a while (usually I use the web UI), and it went into a long “Updating database…” screen. Then the app crashed. I started it again, which brought me to the Me page, and a few moments later the app crashed again (without any scrolling). I tried again, it seemed stable, I scrolled down a few times, then it crashed again. I wanted to find the version number, and guessed that it was under the gear icon, so I tapped that, which showed me the top of the list of settings, but wouldn’t let me scroll down. I realized that the UI was hung, and then the app crashed again. So yes, indeed it is currently quite crashy.
On my next attempt I managed to scroll down on the settings page to find the version number and associated info, which is:
3.0.1, build 601. SDImageCache: 443,751 for 44 files - Un-Uploaded Photos: 3,504,807,277 for 1,163 files.