Campendium has an app for iOS (Apple) users.
You can find the iOS app by searching for 'Campendium' in the App Store, or by clicking this link:
Campendium does not currently offers an Android app. The Campendium website is mobile friendly, so if you're on an Android mobile device we encourage you to open www.campendium.com in a web browser. Campendium's features are also built into Roadtrippers, so if you're an Android user we recommend downloading the Roadtrippers app from the Google Play store so you search and review campgrounds! You can learn more about finding campgrounds, RV parks, and dispersed camping on Roadtrippers, in our guide to Finding Camping on Roadtrippers.