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Top 23 Python Mypy Projects
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Project mention: Pyrefly v1.0 is here (fast type checker and language server for Python) | news.ycombinator.com | 2026-05-14
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result
NOT MAINTAINED - A simple Rust like Result type for Python 3. Fully type annotated. (by rustedpy)
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Doesn't lint cell-internal style. That's nbqa.
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Project mention: janus VS culsans - a user suggested alternative | libhunt.com/r/aio-libs/janus | 2025-12-20
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Deal
🤝 Design by contract for Python. Write bug-free code. Add a few decorators, get static analysis and tests for free.
I wonder if Design by Contract or schema-first design might take off as a way of structuring AI output and allowing it to rapidly iterate toward goals. I'm starting to try these methods out for myself with AI to see where they lead. Looking into https://deal.readthedocs.io/
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aiomonitor
aiomonitor is module that adds monitor and python REPL capabilities for asyncio application
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python-blueprint
🗺️ Example Python project using best practices 🐍 https://github.com/johnthagen/python-blueprint
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mypy_boto3_builder
Type annotations builder for boto3 compatible with VSCode, PyCharm, Emacs, Sublime Text, pyright and mypy.
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Wagtail-Pipit
Pipit is a Wagtail CMS boilerplate which aims to provide an easy and modern developer workflow with a React-rendered frontend.
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micropython-stubber
Generate and maintain stubs for different MicroPython ports to use with VSCode and Pylance, PyRight, Thonny, PyCharm or MyPy
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Python Mypy discussion
Python Mypy related posts
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Pyrefly v1.0 is here (fast type checker and language server for Python)
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janus VS culsans - a user suggested alternative
2 projects | 20 Dec 2025 -
🚀 Mastering FastAPI: The Core Concepts You Can’t Ignore
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Whenever – typed and DST-safe datetimes for Python
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Typed and DST-safe datetimes for Python, available in Rust or pure Python
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Mypy-baseline: make Mypy report only new violations
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How to review as a Pro
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A note from our sponsor - SaaSHub
www.saashub.com | 21 Jun 2026
Index
What are some of the best open-source Mypy projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | strawberry | 4,675 |
| 2 | returns | 4,309 |
| 3 | refurb | 2,536 |
| 4 | whenever | 2,360 |
| 5 | django-stubs | 1,948 |
| 6 | result | 1,691 |
| 7 | nbQA | 1,200 |
| 8 | janus | 963 |
| 9 | Deal | 898 |
| 10 | aiomonitor | 775 |
| 11 | python-blueprint | 735 |
| 12 | classes | 730 |
| 13 | mypy_boto3_builder | 669 |
| 14 | sqlalchemy-stubs | 585 |
| 15 | nitpick | 412 |
| 16 | lagom | 350 |
| 17 | ancv | 268 |
| 18 | Wagtail-Pipit | 255 |
| 19 | micropython-stubber | 251 |
| 20 | mmpm | 243 |
| 21 | textcase | 237 |
| 22 | phantom-types | 235 |
| 23 | cachew | 234 |
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