I have been working in Thailand for over seven years. However, I never took the time to learn how to read Thai. Now that I have a little time to study, I downloaded a bunch of free apps to try them out. Most free apps, and even some of the ones you buy, are not very helpful, or not even accurate. But I was thoroughly impressed with this one. It does a beautiful job of describing the limitations that english phonetics pose for accurately defining the Thai sounds, and makes thorough work of making sure you understand what makes Thai reading unique.