How Stimuler Uses Hume’s AI Voice for Language Learning
By Serena Wang on April 1, 2025

Key Findings:
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Empathy Boosts Engagement: Stimuler leverages Hume’s Empathic Voice Interface (EVI) to create empathic, voice-driven conversations for ESL learners, driving excitement and engagement.
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Strong Results: Hume’s API helped Stimuler launch an empathic conversational feature, achieving a 70% adoption rate and exceeding user expectations for natural, engaging interactions.
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Enhanced Learning Experience: Hume’s technology helps Stimuler deliver more natural and engaging interactions, improving user satisfaction and retention.
About Stimuler: Revolutionizing ESL Learning with Voice-First Technology
Stimuler is a voice-first platform designed to help ESL (English as a Second Language) speakers globally improve their conversational skills. With over 3 million users worldwide and 1M+ downloads on Google Play alone, Stimuler has been recognized as the Best AI App by Google Play. Their mission is to provide the best product for ESL learners to practice and master English through immersive, voice-driven interactions.
As a voice-first product, Stimuler’s users expect to engage in natural, flowing conversations to improve their skills. To enhance this experience, Stimuler experimented with a new conversational feature, made possible by Hume’s Empathic Voice Interface (EVI). This feature allows users to engage in empathic, voice-driven conversations, creating a more natural and engaging learning environment.
The Challenge: Creating Engaging, Empathic Conversations for ESL Learners
Stimuler faced the challenge of moving beyond traditional turn-based conversations in their app to create a more immersive and engaging experience for ESL learners. While their existing features were effective, they wanted to explore how empathic, voice-driven conversations could enhance user engagement and retention.
The key question was: How do users react to empathic, voice-driven conversations, and can this feature drive long-term engagement?
The Solution: Hume’s Empathic Voice Interface (EVI)
Stimuler integrated Hume’s EVI to experiment with a new conversational feature, offering users a more natural and empathic way to practice English. This feature allows users to engage in flowing, voice-driven conversations, while Stimuler’s Assessment and Practice Engines ensure users enjoy the experience and continue improving their skills.
Stimuler selected Hume AI’s EVI for several compelling reasons:
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Core of Empathy: Hume’s EVI excels in fostering emotionally resonant interactions, a crucial element in driving learning motivation and deepening user engagement.
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Effortless Integration: The robust Hume API enabled a swift rollout and iterative testing of innovative conversational features, ensuring a seamless and flexible implementation process
Proven Impact
The integration of the new conversational feature has delivered solid results. With 70% of users in the test group adopting the feature, the response confirms robust engagement and strong endorsement of the empathic, voice-driven interactions. Users have consistently expressed excitement over the natural flow of conversation, affirming that this approach not only meets but exceeds expectations in enhancing language learning. These outcomes validate the efficacy of the feature and reinforce Stimuler’s commitment to delivering an engaging and effective learning experience.
Conclusion: Transforming Language Learning with Empathic AI
Stimuler’s partnership with Hume demonstrates the transformative potential of empathic AI in language learning. By integrating Hume’s EVI, Stimuler has created a more engaging and immersive experience for ESL learners, driving excitement and experimentation with empathic, voice-driven conversations. This innovative approach highlights the importance of emotional intelligence in AI and its ability to enhance user satisfaction and retention in educational technology.
For more information on how empathic AI can enhance your digital solutions, please contact Hume AI.
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