Sifter

AI-powered personalized podcast highlights. Sifter listens to podcasts on your behalf, extracts relevant clips using AI, and stitches them into a polished daily digest with an AI narrator.

What It Does

1. Subscribe to your favorite podcasts
2. AI analyzes new episodes and finds interesting segments
3. Auto-stitches clips with an AI narrator into a digest
4. Listen in your private podcast feed
5. Share your curated digest publicly (optional)

Architecture

Package	Purpose
packages/api	REST API — auth, podcast management, digest generation
packages/app	Nuxt 4 web app — user dashboard, podcast search
packages/db	Prisma schema — users, podcasts, episodes, clips, digests
packages/workers	BullMQ workers — transcription, AI analysis, audio stitching

Tech Stack

• Backend: Nitro (Node.js) with Vercel AI SDK
• Frontend: Nuxt 4 (Vue)
• Database: PostgreSQL + Prisma
• Queue: BullMQ + Redis
• Audio: FFmpeg, OpenAI Whisper, ElevenLabs TTS
• AI: Vercel AI SDK + OpenRouter (GPT-4, Claude, etc.)

Getting Started

pnpm install
# Setup databasecd packages/db
pnpm run prisma:generate
pnpm run prisma:migrate:dev
# Start Redis for workerscd packages/workers
docker-compose up -d
# Start all servicescd ../..
pnpm dev

Environment Variables

# packages/api/.env
DATABASE_URL="postgresql://user:pass@localhost:5432/sifter"
REDIS_URL="redis://localhost:6379"
OPENROUTER_API_KEY="sk-or-..."
ELEVENLABS_API_KEY="..."
WHISPER_API_KEY="..."# OpenAI API key for Whisper# packages/app/.env
NUXT_PUBLIC_API_URL="http://localhost:3001"

AI SDK Configuration

We use Vercel AI SDK with OpenRouter for maximum flexibility:

import{createOpenRouter}from'@openrouter/ai-sdk-provider';constopenrouter=createOpenRouter({apiKey: process.env.OPENROUTER_API_KEY,});// Use any model: GPT-4, Claude, Llama, etc.constmodel=openrouter('anthropic/claude-3.5-sonnet');

Project Structure

sifter/
├── packages/
│ ├── api/ # Nitro API server
│ │ ├── routes/
│ │ │ ├── auth/ # Login/register
│ │ │ ├── podcasts/ # Subscribe, search
│ │ │ ├── digests/ # Generate, list
│ │ │ └── clips/ # Clip details
│ │ └── utils/
│ │ ├── audio.ts # FFmpeg helpers
│ │ ├── whisper.ts # Transcription
│ │ └── ai.ts # Vercel AI SDK + OpenRouter
│ │
│ ├── app/ # Nuxt 4 frontend
│ │ ├── pages/
│ │ │ ├── index.vue # Landing
│ │ │ ├── dashboard.vue # My digests
│ │ │ ├── podcasts.vue # Search & subscribe
│ │ │ └── digest/[id].vue # Listen to digest
│ │ └── components/
│ │ ├── AudioPlayer.vue
│ │ ├── PodcastSearch.vue
│ │ └── DigestCard.vue
│ │
│ ├── db/ # Prisma database
│ │ ├── prisma/
│ │ │ └── schema.prisma # Models
│ │ └── src/
│ │ └── index.ts # Database client
│ │
│ └── workers/ # BullMQ background jobs
│ ├── jobs/
│ │ ├── transcribe.ts # Whisper transcription
│ │ ├── analyze.ts # AI clip selection
│ │ └── stitch.ts # FFmpeg audio mixing
│ └── queues/
│ └── index.ts
│
└── specs/
└── mvp-spec.md # Full MVP specification

Key Features (MVP)

• User auth & profile setup
• Podcast search via iTunes API
• RSS feed subscription (5-10 podcasts)
• Daily/weekly digest generation
• AI clip selection with Vercel AI SDK
• AI narrator with ElevenLabs
• Audio stitching with FFmpeg
• Private podcast feed
• Public digest sharing

Development

# Run everything
pnpm dev
# Run specific package
pnpm --filter api dev
pnpm --filter app dev
pnpm --filter workers dev
# Database commandscd packages/db
pnpm run prisma:studio # Open Prisma Studio
pnpm run prisma:migrate:dev # Create migration

Deployment

• API: Render/Railway
• App: Vercel
• Database: Supabase/Neon
• Redis: Upstash
• Storage: S3 + CloudFront

License

MIT