This app was mentioned in 4 comments, with an average of 3.00 upvotes
But the wiki voyage site has its own app: https://play.google.com/store/apps/details?id=org.kiwix.kiwixcustomwikivoyage
Where users are constantly upgrading the content. I'm kinda lost where is the added value?
If you like Wikitravel, you should get the Kiwix Wikivoyage app which lets you access all that content offline. It's been a huge help to me on my travels, and I highly recommend it to everyone.
WikiVoyage - Offline Travel Guide
https://play.google.com/store/apps/details?id=org.kiwix.kiwixcustomwikivoyage
Next to Maps and Hostelworld, it's my most indispensable travel app.
There is a Wikivoyage Offline Travel Book App which is very useful.