Soyeon Choi
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Sep – Dec 2025

Mimicall: AI Character Video Call for Children with Speech Delays

Flutter app supporting children with speech delays through AI-driven video calls with animated characters.

Code Site

Mimicall Cover Mimicall system architecture

Mimicall is an AI-assisted language therapy app that helps children with speech delays practice speaking through real-time video calls with animated characters. Parents configure target utterances and situations; the AI generates interactive conversations and session reports.

Session Setup

Conversation setup screen

Parents set the target utterance and situation before each session. The AI tailors the call script to guide the child toward producing that specific utterance.

Live AI Call

AI asking question AI responding Milieu Teaching: Prompt, Delay, Reinforce

The AI character uses the Milieu Teaching technique — prompting, delaying, then reinforcing the child's utterance. Real-time color-coded guidelines coach parents on when to intervene.

Session Report

Session report

After each call, a report is generated with utterance count, duration, and an AI-written conversation summary. Paper accepted to KCC 2026.

My Role Designed the study and system architecture, developed the app, managed the project timeline and documentation, and analyzed quantitative and qualitative (interview) results.