Best of the Bangkok transit apps
Been using this for about a year now and for me it's the best of the Bangkok based transit apps. First big plus is that it combines the BTS and MRT services, important when you're trying to get somewhere that needs you to use both. Saves switching apps and you can see your whole route on one app. I find it really easy to enter your start and finish stations unlike others where it can be a bit of a mystery. Has English and Thai language too. One of the apps I use daily in BKK.