You should check out Wanderium: https://www.wanderium.com

It isn't technically a native mobile app, but it works great on your phone's web browser (a native app is on the roadmap). Shameless promotion since I'm the creator, but I'd love to get feedback from my travelers! The mission to help anyone prepare for a trip in minutes instead of hours by removing all the tedious guesswork of figuring out things like visas, vaccines, safety, etc. Think of it like a Turbotax for travel.