From my research, it's pretty clear that the most popular Hindi newspaper in India is Dainik Jagran. This newspaper has the largest readership in the country, reaching millions of readers daily across multiple states. Its popularity can be attributed to its comprehensive coverage of national, regional, and global news in Hindi. In addition, it is praised for its detailed reporting on various subjects, from politics to sports. It's no wonder it's the go-to source for Hindi-speaking readers in India.