Civilopedia

Great app, most of the information is completely up to date. The only issue is that the stock images are missing for a lot of the newer civs. I bought the premium version, and it is definitely worth it. Having no ads is essential! However, even with ads, this app is great as they are generally small and do not interfere with the app too much.

Great app! But can I recommend you to add a "city planning" tab, getting correct adjacency bonuses for districts can be a pain in game without having the correct tech/Civic and/or not having a city settled where you want the district. Along with this adding a method to save presets of city layouts would be helpful too. (Thanks for now adding that in)

Updates are a bit slow when a new patch is released but except few missing pictures of leader it is a very comprehensive guide. It is very good that everything is available when offline and makes a perfect reading material. Recent addition of city planner is quite handy too, it allows you to plan ahead your perfect city based on bonuses/resources around them. As mentioned it has everything you need from civilopedia and much more!