Sarahah is an app for receiving honest feedback from anonymous people. The word "sarahah" is Arabic which means "honesty" in English.
Built by Saudi programmer Zain al-Abidin Tawfiq, Sarahah app was launched in February and hit the Apple App Store in June.
By the end of the month, BBC reported the app already had 2.5 million users in Egypt, 1.7 million in Tunisia, and 1.2 million in Saudi Arabia.
Though it's tough to tell much from Sarahah's website, and the app itself doesn't reveal much, it seems as though Sarahah lets you share your user name with whoever you want so they can send you anonymous messages (the app recommend attaching a link to your username on Snapchats). While you can favorite messages, you can't respond to them.
While Sarahah appears in Arabic on the App Store, the text is in English once the app is downloaded to your phone.
Know more this new app by reading this Business Insider article.