EnglishReady is the most innovative and engaging online / app-based English speaking course, I have found in my 30+ years career as a training professional.  The most striking features that differentiates EnglishReady from other such online courses are:

1. Focus on listening, comprehension and speaking abilities
2. The "Test Your Speech" function helps students practice their speaking skills, without fear or hesitation.  The system evaluates and scores a learner's speech and allows him/her to practice.