The Thai alphabet can seem daunting at first so what I've done with this app so I've prioritized the order in which you learn the letters based on the same system used in my book Learn to Read Thai in 2 Weeks.

The letters of the alphabet are split up into 3 groups generally called "classes" and you can quickly look up a letter to see what class it is which is necessary in determining the tone.

Note that this is not intended as an all-in-one app, but rather it is to help you quickly look up and review individual letters (and their respective sound and class) no matter what level you are. The current version does not include numbers, tone mark explanations or pictures. Most importantly, it does not include transliteration. Transliteration may seem helpful, but it will screw up your pronunciation and in the same amount of time you could learn the alphabet.