Vowel Viewer is tailored towards effective vowel production training based on results of current research and is grounded in second language acquisition theories – it is the first of this kind to be developed for vowel production training. The results of this project show that training with Vowel Viewer is not only effective, but efficient as it results in improvement of L2 vowel production after only five hours of interaction with the program. Such accessible and practical tool would be a useful addition to any L2 classroom, offering learners more motivation and enhancing learner achievement through engagement in individualized vowel production training.