Tag Quran is an app useful to read and research the Holy Quran with multiple language translation (Bengali, English, Hindi, Indonesian, Malay, Tamil and Urudu). For example whenever you read a verse about Musa then you tag that verse with "Musa". This will help to know how many verses related to Musa and how it related to each chapter in Quran. This will give information about how perfectly almighty protected the Quran from corruption.
It is not necessary that you have to tag a verse only in English, you can tag a verse with your favorite language.
Similarly you can tag for messengers, d'ua, warning, dhawa, science, rain, resurrection etc. Apart from tagging a verse you can add unlimited Note and Bookmark.
Another unique feature of TagQuran app is you can change verse translation while you reading a verse. This feature helps to understand the similarity and difference between translation.