තන සතරයThun Sutra is a Sinhala language lifestyle application developed by Geek Avenue. The app is aimed at providing users with a comprehensive understanding of Buddhist teachings, including the Mahamangala Sutta and Ratana Sutta. The app is free to download and is only available on Android.

The app has a simple interface, and new features have been recently added, such as Navigation Drawer and SeekBar with onClick seeking ability. The app's size is only 4.4 MB, making it easy to download and install. The app is an excellent resource for those interested in Buddhism and seeking to learn more about its teachings in Sinhala.