GPT-Migrate

GPT-Migrate is an open-source tool that uses a large language model to port a codebase to another language or framework.

GPT-Migrate walks a codebase and rewrites it toward a target language or framework, for example Node.js via python main.py --targetlang nodejs. It expects Docker to be running so it can build and test as it goes. The authors recommend at least GPT-4, preferably GPT-4-32k, and accept an OpenRouter key by default or an OpenAI key when --model is set. Installation is through Poetry or pip. The README warns that migration is costly and non-trivial, that the current version should not be trusted blindly, and that token costs add up because the tool may rewrite the whole tree.

GPT-Migrate at a glance

Best for: Software engineer
Runs on: CLI, open source
Pricing: Free and open source; model tokens are billed by OpenRouter or OpenAI
Released: July 2023
Category: AI coding tool
Website: gpt-migrate.com

Key features

Language or framework migration driven by an LLM
Docker used to build and test during the run
OpenRouter by default, or OpenAI with --model
Poetry or pip install
CLI flag for the target language
Explicit warning about cost and review

Use it for

Port a small Python service to Node.js as a first test
Estimate whether a migration is even tractable
Rework a sample app before touching production code

Alternatives to GPT-Migrate

Shell GPT — Executes generated shell commands and code snippets directly within the terminal.
jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
Migrateflows — Convert OpenAI, Flowise, and Pipedream workflows directly into n8n format.
OpenCode — Works with 75+ model providers, local models, and existing subscriptions
Genkit — Provides unified APIs and local developer tools for AI application workflows.
GPT Pilot — Builds production-ready applications by working step-by-step with a human developer.
Exodus for Google Cloud Run — Audits applications and moves them to Google Cloud Run with coding agents.
gptme — It works in your local shell without a sandbox, providing direct file access.
OpenSandbox — Provides isolated environments with multi-language SDKs and lifecycle management.
LangChain — Compose exactly the agent your use case needs from model, tools, prompt, and middleware.
OpenClaude — Connects one terminal interface to over 200 different AI models.
OpenShip — Builds run locally or in the cloud and stream to your servers over plain SSH.

All GPT-Migrate alternatives