Another vote for Happy Cow. Makes it easy to bookmark a few places near where you're staying and planning to visit.
There was also another app I used to use which I think was called something like vegan passport? It had written in a bunch of languages that you were vegan and what that meant in good detail. Haven't been able to find it again last time I checked though.
I set this up on my Steam Deck when I first got it. It plays really well on the deck.