Language Master is a 1-2-1 online teaching app available on Android or iOS.
It is an open platform where teachers set their status to available or open times in their schedule that students can book. The student then calls the teacher directly and talks. Payments are calculated per minute and paid at the end of each month after withdrawal.
There are official courses covering IELTS, Business & General English and courses for young learners too, although mainly adults use the platform.