Scrin | desty

Overview

A native macOS app for recording meetings, lectures, and media content, then organizing them with AI. Leveraging Apple Silicon’s MLX framework, all AI processing runs locally. It provides STT and summarization while preserving privacy — no cloud APIs needed.

Architecture

graph LR
    A[Scrin.app] -->|Unix Socket| B[scrin_server.py]
    B --> C[MLX STT<br/>Qwen3-ASR-1.7B]
    B --> D[MLX LLM<br/>Qwen2.5-3B]
    C -->|transcript| A
    D -->|summary| A

Tech Stack

Category	Tech
App	Swift 6 / SwiftUI
Platform	macOS 15+
AI Runtime	MLX (Apple Silicon)
STT Model	Qwen3-ASR-1.7B-8bit
LLM Model	Qwen2.5-3B-Instruct-4bit
IPC	Unix Domain Socket
Editor	Tiptap (WKWebView)
Server	Python (mlx-audio, mlx-lm)

Features

Real-time Recording — Audio activity detection, pause/resume, floating recording prompt
On-device STT — Local transcription with the Qwen3-ASR model, automatic correction of Chinese misrecognition
AI Summarization — Custom summary templates for meetings, lectures, and media categories
Speaker Diarization — Automatic Speaker A/B classification using energy-based spectrum clustering
Ask AI — Q&A based on meeting content with conversation history
Rich Editor — Tiptap-based markdown editor with AI note rewriting
Template System — Customizable system prompts and user templates
Folder Management — Organize meeting notes by folder

Server-App Communication

sequenceDiagram
    participant App as Scrin.app
    participant Srv as scrin_server.py
    participant STT as Qwen3-ASR
    participant LLM as Qwen2.5

    App->>Srv: transcribe (audio path)
    Srv->>STT: generate_transcription
    STT-->>Srv: segments + text
    Srv-->>App: transcript JSON

    App->>Srv: summarize (transcript)
    Srv->>LLM: generate (chat template)
    LLM-->>Srv: structured summary
    Srv-->>App: title + summary JSON

Project Structure

scrin/
├── Scrin/                  # Swift Package
│   ├── Sources/
│   │   ├── App.swift       # App entry point
│   │   ├── Views/          # SwiftUI views
│   │   ├── Models/         # Data models & stores
│   │   ├── Audio/          # Audio capture
│   │   ├── STT/            # Server communication client
│   │   ├── Theme/          # UI theme
│   │   └── Tiptap/         # Rich editor bundle
│   └── Package.swift
└── scrin_server.py         # MLX AI server (STT + LLM)