Case Study
Lexie wins parental trust: Fully automated chatbots in brand design. Technology meets empathy.
How an EdTech startup used Mercury.ai to create an empathetic AI dialogue that seamlessly integrates into the user experience, saving valuable resources even before market entry.

Sandfox Interactive is an innovative startup revolutionizing early childhood education with Lexie, an AI-powered, tactile, yet screen-free learning companion. As a technology partner, Mercury.ai supports Sandfox Interactive not only in delivering support, but also in providing an empathetic, AI-driven dialogue that seamlessly integrates visually into the Lexie world.
The Challenge: Building Trust Without Expending Resources
As an early-stage startup, Lexie had one top priority: earning the trust of parents and children. An off-the-shelf standard chatbot was out of the question. Such a chatbot would have felt like a foreign technical element within the lovingly designed Lexie world.
The team faced a dilemma: How do you provide excellent, empathetic 24/7 support and handle questions (e.g., in the evenings or on weekends) without immediately building out a large service team?
The Three Requirements for the Chatbot
Seamless Integration | Resource Efficiency | Time-to-Value |
|---|---|---|
The AI must blend perfectly into the corporate design in terms of both visuals and tone. | Automation right from the start to prevent the need for a full-time support position. | Rapid implementation in parallel with product development. |
The Solution: An AI Assistant That Understands Lexie
Instead of a simple FAQ solution, the team implemented the Mercury.ai Conversational AI Platform.
Deep Branding via Frontend API: The design team customized the interface down to the smallest detail—from the color palette to the animations. The chatbot does not feel like a tool, but like a native feature of the Lexie world.
Mercury Intelligence: A combination of editorially reviewed content and controlled generative AI ensures that answers are not only factually accurate, but also phrased empathetically and in a child-friendly manner.
No-Code Maintenance: The Lexie team maintains dialogues independently via the no-code interface, without tying up developer resources.

The Impact: More Trust, Less Effort
The project demonstrates that enterprise technology and startup agility can harmonize perfectly. From initial concept to go-live took less than 4 weeks.
Key Results at a Glance
Brand Experience Instead of Support Tickets (Technology Meets Empathy) | The bot authentically conveys how Lexie thinks and speaks. It answers real questions from children and provides game recommendations—a massive trust builder even before purchasing the hardware. |
|---|---|
Leap in Efficiency | Through automation, Lexie avoids adding approximately 1.0 FTE (full-time employee) in support for its market entry. The team can focus entirely on product development, thereby gaining valuable resources. |
24/7 Availability | Because roughly 60% of parent inquiries arrive in the evening hours or over the weekend, the bot ensures an immediate response time and prevents drop-off rates. |
Award-Winning Design (Automated and 100% On-Brand) | The integration was so compelling that Lexie won the internal Mercury.ai Design Award for the most successful widget integration. |
Next Steps

The chatbot will be integrated even more deeply into the Lexie experience world. Plans include proactive orientation support for educational professionals as well as multilingual support for international expansion.
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