The weird thing is that half of the uses of the name on that landing page spell it as "Wanderfull". All of the mock-up screencaps use it, and at the bottom with "Be one of the first people shaping Wanderfull" etc.

So even the creator can't decide what to call it!

I grew up in Norway and there's this idea in Europe of someone who breaks from corporate culture and hikes and camps a lot (called wandervogel in german). I also liked how when pronounced in Norwegian or Swedish it sounds like wander full. I like the idea of someone who is full of wander.

And if you manage to say it outloud, say it to someone else and ask them to spell it. If they can’t spell it, they can’t type it into the url bar.

Also, do it assuming different linguistic backgrounds. It could sound dramatically different by people that speak English but as second language, which are going to be a whole lot of your users, even if the application is in English.

Maybe that's why they didn't go with the English cognate i.e. Wanderfowl, since being foul isn't great branding

What? You don't want travel tips from an itinerant swinger? Or for itinerant swingers?