Hi Nidhi, there is an Android app named "The Horror Story: 1K+ Haunted Scary Ghosts Stories" on Google Play store.
The application has more than 1000+ Horror stories. The application works offline, so read interesting scary stuff offline. The stories are so interesting that will give you the curiosity to read more stories.
The application has some uniques features like "Bookmark" the favorite story to read it for next time. "Mark as Read" option where the story can be marked as read to read the new story next time and many more interesting features are there.