diff --git a/.flake8 b/.flake8
deleted file mode 100644
index 6a2ab30..0000000
--- a/.flake8
+++ /dev/null
@@ -1,4 +0,0 @@
-[flake8]
-max-line-length = 100
-extend-ignore = E203, W503
-exclude = .git,__pycache__,.pytest_cache,.pytest-tmp,venv,env,.venv,static,templates,migrations,node_modules
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3723772..f611eb9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,12 +43,10 @@ jobs:
               run: python -m pip install -r requirements-dev.txt
             - name: Install Node.js dependencies
               run: npm ci --ignore-scripts
-            - name: Run Black
-              run: black --check .
-            - name: Run isort
-              run: isort --check-only .
-            - name: Run Flake8
-              run: flake8 .
+            - name: Run Ruff lint
+              run: ruff check .
+            - name: Check Python formatting
+              run: ruff format --check .
             - name: Run djLint
               run: djlint templates/ --check --profile=jinja
             - name: Run static asset checks
diff --git a/.isort.cfg b/.isort.cfg
deleted file mode 100644
index 44e7470..0000000
--- a/.isort.cfg
+++ /dev/null
@@ -1,9 +0,0 @@
-[settings]
-profile = black
-known_first_party = ["api"]
-line_length = 100
-multi_line_output = 3
-include_trailing_comma = true
-force_grid_wrap = 0
-use_parentheses = true
-skip = migrations,.pytest_cache,.pytest-tmp,.venv,node_modules
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e73c0ea..9cc0632 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,21 +1,12 @@
 exclude: ^(\.pytest_cache|\.pytest-tmp)/
 
 repos:
-  - repo: https://github.com/psf/black
-    rev: 25.1.0
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.16.9
     hooks:
-      - id: black
-        language_version: python3
-  - repo: https://github.com/PyCQA/isort
-    rev: 6.0.1
-    hooks:
-      - id: isort
-        language_version: python3
-  - repo: https://github.com/pycqa/flake8
-    rev: 7.3.0
-    hooks:
-      - id: flake8
-        language_version: python3
+      - id: ruff
+        args: [--fix]
+      - id: ruff-format
   - repo: https://github.com/Riverside-Healthcare/djLint
     rev: v1.36.4
     hooks:
diff --git a/FORMATTERS_AND_LINTERS.md b/FORMATTERS_AND_LINTERS.md
index e3a203a..d3f29a5 100644
--- a/FORMATTERS_AND_LINTERS.md
+++ b/FORMATTERS_AND_LINTERS.md
@@ -9,9 +9,7 @@ This project enforces consistent code style and quality across Python, Jinja tem
 
 | Tool    | Purpose                                      | Config File         | Notes |
 |---------|----------------------------------------------|---------------------|-------|
-| Black   | Code formatter for Python                    | `pyproject.toml`    | Enforces PEP 8 style, auto-formats code |
-| isort   | Sorts and organizes Python imports           | `.isort.cfg`        | Keeps imports grouped and ordered |
-| Flake8  | Linter for Python code quality               | `.flake8`           | Reports style and logic issues |
+| Ruff    | Python linter, import sorter, and formatter  | `pyproject.toml`    | Replaces Flake8, isort, and Black |
 | djlint  | Formatter/linter for Jinja templates         | `.djlintrc`         | Only runs on `.jinja` files |
 
 **Exclusions:** The `migrations/` folder is excluded from all Python formatters/linters to avoid altering migration scripts.
@@ -33,7 +31,7 @@ All static asset tools are managed via `package.json` (see `devDependencies` and
 ## Automation
 
 - **Pre-commit hooks**: `.pre-commit-config.yaml` runs all formatters and linters automatically on commit for Python, Jinja, JS, and CSS files.
-	- Python: Black, isort, Flake8
+	- Python: Ruff lint and format hooks
 	- Jinja: djlint (only on `.jinja` files)
 	- JS/CSS: Prettier, ESLint, Stylelint (via npm scripts)
 
@@ -68,8 +66,8 @@ All static asset tools are managed via `package.json` (see `devDependencies` and
 
 ### Python/Jinja
 - Install dev tools: `pip install -r requirements-dev.txt`
-- Format code: `black .` and `isort .`
-- Lint code: `flake8 .`
+- Format code: `ruff check --fix .` and `ruff format .`
+- Lint code: `ruff check .`
 - Format/lint Jinja: `djlint templates/ --reformat --profile=jinja`
 
 ### JavaScript/CSS
@@ -101,9 +99,7 @@ All static asset tools are managed via `package.json` (see `devDependencies` and
 ---
 
 ## References
-- [Black](https://black.readthedocs.io/)
-- [isort](https://pycqa.github.io/isort/)
-- [Flake8](https://flake8.pycqa.org/)
+- [Ruff](https://docs.astral.sh/ruff/)
 - [djlint](https://djlint.com/)
 - [ESLint](https://eslint.org/)
 - [Stylelint](https://stylelint.io/)
diff --git a/database.py b/database.py
index fcf1382..477a97d 100644
--- a/database.py
+++ b/database.py
@@ -282,11 +282,13 @@ def get_expired_comparisons(retention_days: int):
     expired_ids = []
 
     # Get all comparisons with their expiration settings
-    comparisons = query(("""
+    comparisons = query((
+        """
         SELECT id, expiration_type, expiration_days, created_at,
                last_accessed, never_expire
         FROM comparisons
-        """))
+        """
+    ))
     print(f"Checking for expired comparisons with retention_days={retention_days}")
     num = len(comparisons)
     print(f"Found {num} comparisons to check for expiration")
diff --git a/pyproject.toml b/pyproject.toml
index 81f9f06..6c48892 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,13 +8,27 @@ authors = [
 
 requires-python = ">=3.13"
 
-[tool.black]
+[tool.ruff]
 line-length = 100
-target-version = ['py38']
-include = '\.pyi?$'
-exclude = '''
-/(\.pytest_cache|\.pytest-tmp|venv|env|\.venv|static|templates|migrations|node_modules)/
-'''
+target-version = "py313"
+extend-exclude = [
+    ".pytest_cache",
+    ".pytest-tmp",
+    "venv",
+    "env",
+    "static",
+    "templates",
+    "migrations",
+    "node_modules",
+]
+force-exclude = true
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I"]
+ignore = ["E203"]
+
+[tool.ruff.lint.isort]
+known-first-party = ["api"]
 
 [tool.pytest.ini_options]
 addopts = "--strict-markers --strict-config --basetemp=.pytest-tmp"
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4d26161..6239726 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,5 @@
 # Development requirements for formatting, linting and tests
-black==26.5.1
-isort==8.0.1
-flake8==7.4.1
+ruff==0.16.9
 djlint==1.44.2
 pre-commit==4.6.2
 setuptools==84.0.0
diff --git a/scripts/check_format_lint.bat b/scripts/check_format_lint.bat
index 7603a08..f574217 100644
--- a/scripts/check_format_lint.bat
+++ b/scripts/check_format_lint.bat
@@ -5,9 +5,8 @@ echo.
 echo =============================
 echo   Checking Python files
 echo =============================
-black --check .
-isort --check-only .
-flake8 .
+ruff check .
+ruff format --check .
 
 echo.
 echo =============================
diff --git a/scripts/check_format_lint.sh b/scripts/check_format_lint.sh
index 9feb42b..c3633f0 100644
--- a/scripts/check_format_lint.sh
+++ b/scripts/check_format_lint.sh
@@ -5,9 +5,8 @@ echo
 echo "============================="
 echo "  Checking Python files"
 echo "============================="
-black --check .
-isort --check-only .
-flake8 .
+ruff check .
+ruff format --check .
 
 echo
 echo "============================="
diff --git a/scripts/format_all.bat b/scripts/format_all.bat
index be7f199..36d2016 100644
--- a/scripts/format_all.bat
+++ b/scripts/format_all.bat
@@ -6,9 +6,9 @@ echo.
 echo =============================
 echo   Formatting Python files
 echo =============================
-black .
-isort .
-flake8 .
+ruff check --fix .
+ruff format .
+ruff check .
 
 echo.
 echo =============================
diff --git a/scripts/format_all.sh b/scripts/format_all.sh
index 9174e7d..62d12a0 100644
--- a/scripts/format_all.sh
+++ b/scripts/format_all.sh
@@ -7,9 +7,9 @@ echo
 echo "============================="
 echo "  Formatting Python files"
 echo "============================="
-black .
-isort .
-flake8 .
+ruff check --fix .
+ruff format .
+ruff check .
 
 echo
 echo "============================="
diff --git a/scripts/migrate_sqlite_to_postgres.py b/scripts/migrate_sqlite_to_postgres.py
index 8117f6b..4b526a0 100644
--- a/scripts/migrate_sqlite_to_postgres.py
+++ b/scripts/migrate_sqlite_to_postgres.py
@@ -107,7 +107,7 @@ def _reset_sequences(
             continue
         # seq is like 'public.users_id_seq'
         execute_fn(
-            (f"SELECT setval('{seq}', " f"(SELECT COALESCE(MAX(id), 1) FROM {tbl}), true)"),
+            (f"SELECT setval('{seq}', (SELECT COALESCE(MAX(id), 1) FROM {tbl}), true)"),
             (),
         )
 
@@ -135,7 +135,7 @@ def migrate(sqlite_path: str, pg_url: str, wipe_target: bool = False):
     # Point adapter at Postgres and ensure schema
     os.environ["DB_BACKEND"] = "postgres"
     os.environ["DATABASE_URL"] = pg_url
-    # Import app modules lazily (after sys.path and env are set) to satisfy flake8 E402
+    # Import app modules lazily (after sys.path and env are set) to satisfy Ruff E402
     import database  # type: ignore  # noqa: WPS433
     from db import backend_name as _backend_name  # type: ignore  # noqa: WPS433
     from db import execute as _execute