Source: https://seerepo.com/r/langchain-ai/langgraph/built
Markdown source: https://seerepo.com/r/langchain-ai/langgraph/built.md
Description: langgraph is a Python repo. It stores its data in Postgres, SQLite, and sqlite-vec. It has 206,994 written lines, with 247 test files.

# What is langgraph built with?

langgraph is a Python repo. It stores its data in Postgres, SQLite, and sqlite-vec, uses AI through LangGraph, LangChain, langgraph-sdk, and langchain-protocol, validates its data with Pydantic, and uses aiosqlite, psycopg, and psycopg-pool. It has 206,994 written lines, with 247 test files.

Read on November 6, 2026, at commit 5847733.

Repository: https://github.com/langchain-ai/langgraph

## Backend

### Data

- **[aiosqlite](https://seerepo.com/uses/aiosqlite)**
- **[psycopg](https://seerepo.com/uses/psycopg)**
- **psycopg-pool**
- **[Postgres](https://seerepo.com/uses/postgres)**: 9 files · [libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py, line 22](https://github.com/langchain-ai/langgraph/blob/5847733bcb186c26b32da5cc822eaf8a89deffeb/libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py#L22)
- **[SQLite](https://seerepo.com/uses/sqlite)**: 3 files · [libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/aio.py, line 11](https://github.com/langchain-ai/langgraph/blob/5847733bcb186c26b32da5cc822eaf8a89deffeb/libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/aio.py#L11)
- **sqlite-vec**: 2 files

### AI

- **[LangGraph](https://seerepo.com/uses/langgraph)**
- **[LangChain](https://seerepo.com/uses/langchain)**: 56 files
- **langgraph-sdk**: 38 files
- **langchain-protocol**: 12 files

## Support

### Validation

- **[Pydantic](https://seerepo.com/uses/pydantic)**: 11 files

### Tools

- **click**: 10 files
- **pathspec**: 3 files

### Other

- **httpx**: 20 files
- **orjson**: 12 files
- **websockets**: 3 files
- **xxhash**: 2 files
- **ormsgpack**: 1 file
- **python-dotenv**: 1 file
- **tomli**: 1 file

## Other repos with a similar stack

- [datawhalechina/hello-agents](https://seerepo.com/r/datawhalechina/hello-agents/built): aiosqlite, Postgres, SQLite, LangGraph, Pydantic · [Compare](https://seerepo.com/compare/datawhalechina/hello-agents/vs/langchain-ai/langgraph)
- [mem0ai/mem0](https://seerepo.com/r/mem0ai/mem0/built): psycopg, Postgres, SQLite, LangChain, Pydantic · [Compare](https://seerepo.com/compare/langchain-ai/langgraph/vs/mem0ai/mem0)
- [run-llama/llama_index](https://seerepo.com/r/run-llama/llama_index/built): aiosqlite, psycopg, SQLite, LangChain, Pydantic · [Compare](https://seerepo.com/compare/langchain-ai/langgraph/vs/run-llama/llama_index)
- [666ghj/BettaFish](https://seerepo.com/r/666ghj/BettaFish/built): aiosqlite, psycopg, Postgres, SQLite, Pydantic · [Compare](https://seerepo.com/compare/666ghj/BettaFish/vs/langchain-ai/langgraph)
- [HKUDS/Vibe-Trading](https://seerepo.com/r/HKUDS/Vibe-Trading/built): LangGraph, LangChain, langgraph-sdk, langchain-protocol, Pydantic · [Compare](https://seerepo.com/compare/HKUDS/Vibe-Trading/vs/langchain-ai/langgraph)
- [bytedance/deer-flow](https://seerepo.com/r/bytedance/deer-flow/built): aiosqlite, SQLite, LangGraph, LangChain · [Compare](https://seerepo.com/compare/bytedance/deer-flow/vs/langchain-ai/langgraph)

## Frequently asked questions

### What language is langgraph written in?

langgraph is written in Python, with 206,994 written lines.

### What database does langgraph use?

langgraph stores its data in Postgres, SQLite, and sqlite-vec.

The proof: [libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py, line 22](https://github.com/langchain-ai/langgraph/blob/5847733bcb186c26b32da5cc822eaf8a89deffeb/libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py#L22)

### Does langgraph use AI?

Yes. langgraph uses AI through LangGraph, LangChain, langgraph-sdk, and langchain-protocol.

### What services does langgraph use?

langgraph uses aiosqlite, psycopg, and psycopg-pool.

### Does langgraph have tests?

Yes. langgraph has 247 test files.

### Which repos have a stack like langgraph's?

The ones that share most of its stack: datawhalechina/hello-agents, mem0ai/mem0, and run-llama/llama_index.

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.