marpy.io

marpy.io is a browser-based IDE and development platform built specifically for Python developers. It combines an AI coding assistant with safety rails that catch common mistakes before they hit production. The tool intercepts destructive database commands, pins package versions to current PyPI releases, keeps secrets in a managed vault, and wraps the terminal so a stray rm -rf can't escape the project folder. Instead of letting the LLM freelance as your DBA, marpy forces database changes through versioned Alembic migrations and blocks destructive DDL on production environments unless you manually confirm.

The platform works in four steps: you build and test code in a Python-first sandbox with proper virtualenvs and real logs; connect a managed MariaDB database that won't reset when the container restarts; deploy via date-based tags that trigger containerized builds; and let marpy handle SSL, routing, and hosting. The AI assistant indexes documentation for every package it installs, so the code it writes matches the actual runtime API. Features like utf8mb4 for emoji support, S3-style blob storage, UTC timestamps, and structured observability come built-in — they're opinions the team formed from years of backend pain.

Python developers who are tired of JavaScript-first tools like v0 or Replit will find marpy a natural fit. It's especially useful for solo founders and small teams shipping Python backends who want an LLM to help write code without worrying about it accidentally dropping tables or hardcoding API keys. You can also pair it with a frontend tool like v0 and point your API calls at marpy for the backend. The whole stack is standard Python and containers, so if marpy ever goes away, you can deploy the same containers elsewhere.