Chuloo/mural

What it solves

Mural is a language learning application designed to help users acquire a new language through natural, live voice conversations rather than static exercises. It addresses the need for adaptive practice by adjusting the difficulty of conversations based on the user's actual performance and tracking vocabulary recall over time.

How it works

The app uses a native iPhone interface (SwiftUI) and connects to OpenAI's API (specifically GPT-Live-1 and GPT-5.6 Luna) to power real-time voice interactions. Users speak to an animated orb, and the system provides gentle corrections and optional meaning subtitles. It tracks "recall strength" for words using a heuristic system of one to three bars based on repeated retrieval across different contexts. The app operates locally using SwiftData for storage and requires the user to provide their own OpenAI API key.

Who it’s for

Language learners who prefer conversational practice over traditional coursework and have an iPhone and an OpenAI API key. It supports multiple languages including Norwegian, Spanish, English, French, German, Italian, Brazilian Portuguese, and Mandarin.

Highlights

• Live Voice Interaction: Real-time conversational practice with voice output and microphone input.
• Adaptive Learning: Adjusts challenge levels based on evidence from user replies.
• Recall Tracking: Visual bars that summarize vocabulary retrieval strength over time.
• Themed Conversations: Includes 24 pre-set conversation settings with cultural details or the ability to request current topics via web search.
• Privacy-Focused: Stores conversations and vocabulary locally on the device without a cloud account.