Praktika, an innovative language learning platform, has significantly expanded its global reach by leveraging ElevenLabs' advanced text-to-speech (TTS) technology. This partnership has enabled the creation of hyper-realistic generative AI avatars that deliver emotionally expressive and human-like voices, enhancing the user experience during language tutoring sessions. Since collaborating with ElevenLabs in early 2024, Praktika has seen a three-fold increase in monthly voice credit usage, with peaks of five times during high-volume months, as it expanded its offerings from one to nine languages for millions of users. Users have reported increased session engagement and extended session lengths due to the natural and engaging quality of the voices, which have become an integral part of Praktika's brand identity. The app's voice upgrade campaign went viral on social media, propelling it into the top 10 global language learning apps by user ranking. ElevenLabs' TTS system's scalability, multilingual support, and code-switching capabilities have been crucial in supporting Praktika's growth without sacrificing the quality or emotional realism of the learning experience.