diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c5c1af9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,228 @@
+# Created by https://www.toptal.com/developers/gitignore/api/python,visualstudiocode,macos
+# Edit at https://www.toptal.com/developers/gitignore?templates=python,visualstudiocode,macos
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+# End of https://www.toptal.com/developers/gitignore/api/python,visualstudiocode,macos
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0a2168f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Comparing Hatch, Poetry, and Rye
+
+* [hatch-demo](./hatch-demo/README.md)
diff --git a/hatch-demo/README.md b/hatch-demo/README.md
new file mode 100644
index 0000000..105f4c8
--- /dev/null
+++ b/hatch-demo/README.md
@@ -0,0 +1,105 @@
+# Hatch Demo
+
+## Steps
+
+1. Install `hatch`
+
+```bash
+$ pipx install hatch
+# or 
+$ brew install pipx
+```
+
+2. Create new project
+```bash
+$ hatch new "Hatch Demo"
+$ cd hatch-demo
+```
+
+3. Create default environment
+```bash
+$ hatch env create
+```
+
+4. Set `uv` as the default installer by adding this to `pyproject.toml`:
+
+```toml
+[tool.hatch.envs.default]
+installer = "uv"
+```
+
+5. Add dependencies (`requests`, `polars`, `pytest`, `ruff`)
+    * Note 1: I didn't see a way to add deps via `hatch` command, so this was manually done by editing `pyproject.toml`. (This seems to be the procedure described in [their docs](https://hatch.pypa.io/dev/environment/#dependencies).)
+    * Note 2: Add `pytest` and `ruff` under the `dev` environment.
+
+```toml
+[tool.hatch.envs.default]
+installer = "uv"
+dependencies = ["polars", "requests"]
+
+[tool.hatch.envs.dev]
+installer = "uv"
+dependencies = [
+  "hatch-demo",
+  "pytest",
+  "ruff"
+]
+```
+_Note: You have to reference `hatch-demo` in order to get the project deps needed for running tests._
+
+6. Add `test` and `lint` scripts to `dev` env
+
+```toml
+[tool.hatch.envs.dev.scripts]
+test = "pytest"
+lint = "ruff check --fix && ruff format"
+```
+
+7. Create/install the env
+
+```bash
+$ hatch env create dev
+```
+
+8. Add code (`demo.py`) and tests (`test_demo.py`)
+
+9. Check envs
+
+```bash
+$ hatch env show
+                  Standalone                  
+┏━━━━━━━━━┳━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━┓
+┃ Name    ┃ Type    ┃ Dependencies ┃ Scripts ┃
+┡━━━━━━━━━╇━━━━━━━━━╇━━━━━━━━━━━━━━╇━━━━━━━━━┩
+│ default │ virtual │ polars       │ run     │
+│         │         │ requests     │         │
+├─────────┼─────────┼──────────────┼─────────┤
+│ dev     │ virtual │ pytest       │ lint    │
+│         │         │ ruff         │ run     │
+│         │         │              │ test    │
+└─────────┴─────────┴──────────────┴─────────┘
+```
+
+10. Run tests and lint/format code
+
+```bash
+$ hatch run dev:test
+$ hatch run dev:lint
+```
+
+11. Add default script to run the app
+
+```toml
+[tool.hatch.envs.default.scripts]
+run = "python src/hatch_demo/demo.py"
+```
+
+12. Run the app
+```bash
+$ hatch run default:run
+```
+
+## Notes
+
+* Not sure how to install the project so that it can called like `python -m hatch_demo`
+* Not sure how to call the entrypoint scripts
\ No newline at end of file
diff --git a/hatch-demo/pyproject.toml b/hatch-demo/pyproject.toml
new file mode 100644
index 0000000..1c8d7aa
--- /dev/null
+++ b/hatch-demo/pyproject.toml
@@ -0,0 +1,52 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "hatch-demo"
+dynamic = ["version"]
+description = ''
+readme = "README.md"
+requires-python = ">=3.12"
+license = "MIT"
+keywords = []
+authors = [
+  { name = "David Kun", email = "davidkun4@gmail.com" },
+]
+classifiers = [
+  "Development Status :: 4 - Beta",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: Implementation :: CPython",
+  "Programming Language :: Python :: Implementation :: PyPy",
+]
+dependencies = []
+
+[project.urls]
+Source = "https://github.com/davidkun/hatch-vs-poetry-vs-rye"
+
+[tool.hatch.version]
+path = "src/hatch_demo/__about__.py"
+
+[tool.hatch.envs.default]
+installer = "uv"
+dependencies = [
+  "polars",
+  "requests"
+]
+
+[tool.hatch.envs.default.scripts]
+run = "python src/hatch_demo/demo.py"
+
+[tool.hatch.envs.dev]
+installer = "uv"
+dependencies = [
+  "hatch-demo",
+  "pytest",
+  "ruff"
+]
+
+[tool.hatch.envs.dev.scripts]
+test = "pytest"
+check = "ruff check"
+lint = "ruff check --fix && ruff format"
\ No newline at end of file
diff --git a/hatch-demo/src/hatch_demo/__about__.py b/hatch-demo/src/hatch_demo/__about__.py
new file mode 100644
index 0000000..f102a9c
--- /dev/null
+++ b/hatch-demo/src/hatch_demo/__about__.py
@@ -0,0 +1 @@
+__version__ = "0.0.1"
diff --git a/hatch-demo/src/hatch_demo/__init__.py b/hatch-demo/src/hatch_demo/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/hatch-demo/src/hatch_demo/__main__.py b/hatch-demo/src/hatch_demo/__main__.py
new file mode 100644
index 0000000..c70a4b8
--- /dev/null
+++ b/hatch-demo/src/hatch_demo/__main__.py
@@ -0,0 +1,4 @@
+from demo import main
+
+if __name__ == "__main__":
+    main()
diff --git a/hatch-demo/src/hatch_demo/demo.py b/hatch-demo/src/hatch_demo/demo.py
new file mode 100644
index 0000000..a88df86
--- /dev/null
+++ b/hatch-demo/src/hatch_demo/demo.py
@@ -0,0 +1,26 @@
+from io import StringIO
+import requests
+import polars as pl
+
+IRIS = "https://raw.githubusercontent.com/mwaskom/seaborn-data/master/iris.csv"
+
+
+def main():
+    result = analyze(dataframe_from(iris_data()))
+    print(result)
+
+
+def iris_data(url: str = IRIS) -> str:
+    return requests.get(url).text
+
+
+def dataframe_from(csv_data: str) -> pl.DataFrame:
+    return pl.read_csv(StringIO(csv_data))
+
+
+def analyze(df: pl.DataFrame) -> pl.DataFrame:
+    return df.filter(pl.col("sepal_length") > 5).group_by("species").agg(pl.all().sum())
+
+
+if __name__ == "__main__":
+    main()
diff --git a/hatch-demo/tests/__init__.py b/hatch-demo/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/hatch-demo/tests/test_demo.py b/hatch-demo/tests/test_demo.py
new file mode 100644
index 0000000..c25f476
--- /dev/null
+++ b/hatch-demo/tests/test_demo.py
@@ -0,0 +1,9 @@
+from hatch_demo.demo import dataframe_from
+
+
+def test_dataframe_from():
+    df = dataframe_from(
+        """A,B,C
+    0.0,10.0,200.1"""
+    )
+    assert len(df.count()) == 1