THE CHALLENGE is a free Android app developed by ZIKTO under the Lifestyle category and Health & Fitness subcategory. This app allows users to compete with other users based on their daily step counts and win rewards depending on their rankings.

THE CHALLENGE offers various walking missions and competitions that reward users with higher ranks among participants. The app can be connected with ZIKTO Walk, FITBIT, Apple Watch, and iOS ("Health" app) to track step counts accurately.

Although the service is only available in Korea, the global version will be launched later inStart walking more and winning prizes by leading THE CHALLENGE!