What is 9Apps?
9Apps is a free third-party app store for Android that provides you fast install for thousands of latest apps and games. A lot of cool features come along with the app store such as app sharing, junk cleaner to speed up your phone, app uninstaller, file manager and many more exciting functions.
Why playstore is not working?
Your first try at fixing this should be to clear the Google Play Store and Google Play Services cache. Furthermore, you can uninstall and re-install updates to the Google Play Store. Also, make sure you are running the latest software available for your Android device.
Who made 9Apps?
9Apps and 9Game was launched in 2012. Just after three years 9Apps and 9Game have acquired a huge amount of user base. Both are a part of UCWeb which comes under the Alibaba Group`s mobile business division. They operate in India, Russia and Middle east.

Why am I not able to install any app?
Open Settings > Apps & Notifications > See all apps and navigate to the Google Play Store’s App Info page. Tap on Force Stop and check if the issue gets resolved. If not, click on Clear Cache and Clear Data, then re-open the Play Store and try the download again.