Luminality

Inspiration

Luminality is a voice-only, AI-native journaling app where the AI acts as a spiritual guide. It listens to your voice, detects emotional undertones using Hume AI, and automatically writes journal entries using ChatGPT. Journaling happens in the background—seamlessly and invisibly—allowing users to focus on presence instead of productivity. For the hackathon, we offer 15 minutes of voice interaction per user, with full access to past entries.

What it does

Luminality is a voice-only, AI-native journaling app where the AI acts as a spiritual guide. It listens to your voice, detects emotional undertones using Hume AI, and automatically writes journal entries using ChatGPT. Journaling happens in the background—seamlessly and invisibly—allowing users to focus on presence instead of productivity. For the hackathon, we offer 15 minutes of voice interaction per user, with full access to past entries.

How we built it

• Frontend: Bolt.new for a clean, minimalist UI experience.
• Voice & Emotion AI: Hume AI to analyze tone and emotional context.
• LLM Layer: ChatGPT to interpret, summarize, and generate journal entries.
• Backend: Supabase for user auth, storage, and usage tracking.

We started with a UI-based onboarding flow that filters in invested users before activating voice interaction. Voice sessions are limited and tracked, and once the limit is hit, the user can review previous content but not initiate new ones.

Challenges we ran into

• Integrating Hume AI and managing token/minute budgets efficiently.
• Designing a voice-first UX that doesn't feel robotic or transactional.
• Creating a calming, soulful experience within a technical and time-constrained environment.

Accomplishments that we're proud of

• A working prototype that can hold a voice conversation, understand user emotion, and journal meaningfully.
• A UX that is focused, subtle, and spiritually inspired.
• Scoping tightly to deliver a truly AI-native experience that feels unique.

What we learned

• Simplicity often requires more intention and clarity than complexity.
• Emotion-aware AI creates a powerful new UX frontier when paired with journaling.
• Voice-only design changes the way we think about flow, affordances, and session management.

What's next for Luminality

• Add monetization via a $20/month tier for 1 hour of voice interaction.
• Daily rituals and reflection prompts.
• Emotion tracking trends over time (for users, not visible to AI).
• Deeper personalization of the spiritual guide.

Built With

• bolt.new
• chatgpt
• hume
• supabase