The developers are already working on a mobile app! It’s in closed beta to people who have contributed financially to the development effort but you can check the status here: Mobile app beta
Hi do you know if it will be a universal app that can run on all 3 OS on the M1 chip? https://developer.apple.com/programs/universal/
I am not a programer so would not know if Obsidian app can ported as a Apple Universal app which have all the same features on MacOs, iPadOS and iOS.