The St Petersburg Underground Guide and Route Planner is a free Android app developed by Discover Ukraine LLC. It is a handy tool for anyone looking to navigate the city using the underground service. The app provides accurate and up-to-date underground maps, a quick and convenient route planner with travel time and distance information, and an exact trip cost calculator.

One of the standout features of this app is the Augmented Reality function, which allows users to find the nearest underground station to their location. Additionally, the app provides useful information about routes, prices, and payment options. Another great aspect of the app is that it works offline, making it a great companion for travelers who may not have access to the internet at all times.

Overall, the St Petersburg Underground Guide and Route Planner is a highly useful app for anyone traveling to or living in St Petersburg. It is easy to use, informative, and provides all the information needed to navigate the underground service with ease.