Flask SaaS Starter Kit

A ready-to-deploy boilerplate for building micro-SaaS products with Python.

What's included

• SQLite WAL mode — fast, zero-config database with concurrent reads
• User auth — register/login/logout with SHA-256 password hashing
• API keys — auto-generated per user for programmatic access
• Per-tier rate limiting — free (10/h), pro (100/h), unlimited
• Stripe-ready — checkout integration skeleton included
• systemd deploy — no Docker, no gunicorn, just systemctl start myapp
• Admin dashboard skeleton — user management, metrics

Quick start

# 1. Clone
git clone https://github.com/clementslowik/flask-saas-starter.git
cd flask-saas-starter

# 2. Run
python3 app.py

# 3. Open http://localhost:5000

# 4. Deploy to production
cp systemd/myapp.service /etc/systemd/system/
systemctl enable --now myapp

Structure

├── app.py              # Main application (single file, ~200 lines)
├── data.db             # SQLite database (auto-created)
├── systemd/
│   └── myapp.service   # systemd unit file
└── README.md

API

# Register
curl -X POST http://localhost:5000/register \
  -d "email=me@example.com&password=secret123"

# Get your API key from /dashboard

# Use the API
curl http://localhost:5000/api/example \
  -H "X-API-Key: sk_your_key_here"

Customize

1. Add your own routes in app.py
2. Add tables to init_db()
3. Set SECRET_KEY environment variable
4. Add Stripe keys for billing

Stack

• Python 3.12+
• Flask
• SQLite (WAL mode)
• systemd
• No external dependencies beyond Flask

License

MIT — use it for anything.

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Part of the foxyyy ecosystem.