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React NativeExpoSupabasepgvectorGemini AITauri v2

Aion

Aion is an AI-powered Bible companion that lets users ask questions about scripture in plain language. Responses are grounded in actual Bible data retrieved via a Hybrid RAG pipeline combining keyword matching and semantic vector search (pgvector), then streamed in real time via SSE from Gemini. The app runs on mobile (React Native + Expo) and desktop (Tauri v2).

Repo

01. Problem

Bible study tools are either keyword-only search engines that miss semantic meaning, or AI chatbots that hallucinate verses. Users need conversational AI that is genuinely grounded in scripture with verifiable citations.

02. Solution Overview

  • Built a Hybrid RAG pipeline combining regex-based keyword extraction with OpenAI embedding (1536-dim) + pgvector semantic search
  • Implemented real-time SSE streaming from Gemini via Supabase Edge Functions
  • Designed rich inline verse cards with full book/chapter/verse attribution for verifiability
  • Added cross-platform support: React Native for mobile + Tauri v2 for native desktop

Build

Tech Stack

React Native 0.81Expo 54TypeScriptSupabase PostgreSQLpgvectorOpenAI EmbeddingsGemini 3.1 FlashTauri v2TanStack Query v5NativeWind
  • • Hybrid RAG pipeline: regex keyword extraction + OpenAI embedding (1536-dim) + pgvector semantic search
  • • Real-time SSE streaming from Gemini via Supabase Edge Functions
  • • Rich inline verse cards with book/chapter/verse attribution
  • • Cross-platform: React Native (iOS/Android) + Tauri v2 (macOS/Windows/Linux)

Secure

  • All API keys (OpenAI, Gemini, service_role) stored server-side only in Edge Function secrets
  • IP-based rate limiting: 5/min burst, 30/3hrs per IP, 200/day global cap
  • Row-Level Security (RLS) on all Supabase tables
  • 500-character message length cap to prevent token-stuffing
  • Exact-match response cache (zero LLM cost on repeated queries)
  • Fail-closed: rate limit errors default to deny

03. Proof & Verification

Verified Claims

  • >Hybrid RAG retrieval ensures answers are grounded in actual scripture, not hallucinated
  • >IP-based rate limiting (5/min burst, 30/3hrs, 200/day) with fail-closed defaults
  • >Exact-match response cache eliminates redundant LLM costs
  • >Anonymous auth with zero sign-up friction — Supabase RLS enforced on all tables

Project Links

Source Code