When should I use Flask-Migrate instead of South?

Managing SQLAlchemy migrations in Flask applications via a thin Alembic integration layer. Flask projects that want Alembic migration commands exposed through the Flask CLI. Teams already using Flask and SQLAlchemy who want minimal extra configuration

When should I use South instead of Flask-Migrate?

Historical Django schema migrations for codebases running Django 1.6 or earlier. Maintaining very legacy Django projects that have not been upgraded in over a decade. Understanding Django migration history — South directly inspired the built-in migrations system

What are the main weaknesses of Flask-Migrate?

Thin wrapper around Alembic that adds little beyond CLI convenience. Inherits all Alembic limitations: auto-generation needs review, merge conflicts require care. Only relevant inside a Flask and SQLAlchemy stack — no standalone use case

What are the main weaknesses of South?

Completely obsolete — Django's built-in migrations superseded South in Django 1.7 (2014). Not compatible with Django 2.x or any later version. No active maintenance or security updates; should be removed from any active codebase

Flask-Migrate vs South: Key Differences for Python Data Engineering

Database Migration Tools

Flask-Migrate

Database Migrations for Flask

★ 4.5

MIT

pip install flask-migrate

South

Legacy Django Migrations

★ 4.0

Apache-2.0

pip install South

Side-by-Side Comparison

Flask-Migrate

South

Flask-Migrate

South

Best For

✓Managing SQLAlchemy migrations in Flask applications via a thin Alembic integration layer
✓Flask projects that want Alembic migration commands exposed through the Flask CLI
✓Teams already using Flask and SQLAlchemy who want minimal extra configuration

✓Historical Django schema migrations for codebases running Django 1.6 or earlier
✓Maintaining very legacy Django projects that have not been upgraded in over a decade
✓Understanding Django migration history — South directly inspired the built-in migrations system

Best For

✓Managing SQLAlchemy migrations in Flask applications via a thin Alembic integration layer
✓Flask projects that want Alembic migration commands exposed through the Flask CLI
✓Teams already using Flask and SQLAlchemy who want minimal extra configuration

✓Historical Django schema migrations for codebases running Django 1.6 or earlier
✓Maintaining very legacy Django projects that have not been upgraded in over a decade
✓Understanding Django migration history — South directly inspired the built-in migrations system

Weaknesses

•Thin wrapper around Alembic that adds little beyond CLI convenience
•Inherits all Alembic limitations: auto-generation needs review, merge conflicts require care
•Only relevant inside a Flask and SQLAlchemy stack — no standalone use case

•Completely obsolete — Django's built-in migrations superseded South in Django 1.7 (2014)
•Not compatible with Django 2.x or any later version
•No active maintenance or security updates; should be removed from any active codebase

Weaknesses

•Thin wrapper around Alembic that adds little beyond CLI convenience
•Inherits all Alembic limitations: auto-generation needs review, merge conflicts require care
•Only relevant inside a Flask and SQLAlchemy stack — no standalone use case

•Completely obsolete — Django's built-in migrations superseded South in Django 1.7 (2014)
•Not compatible with Django 2.x or any later version
•No active maintenance or security updates; should be removed from any active codebase

License

MIT

Apache-2.0

License

MIT

Apache-2.0

Install

pip install flask-migrate

pip install South

Install

pip install flask-migrate

pip install South

Rating

★ 4.5

★ 4.0

Rating

★ 4.5

★ 4.0

Key Features

Flask-Migrate

1Wraps Alembic to provide Flask CLI commands: `flask db init/migrate/upgrade`
2Auto-generates migrations by comparing SQLAlchemy models to live database
3Stores migration history in a `migrations/` directory under version control
4Supports multiple databases and bind configuration in Flask apps
5Rollback support via `flask db downgrade`

South

1Pre-Django-1.7 migration framework providing schema and data migrations
2Supports forward and backward migration for rollback capability
3Auto-detection of model changes to generate migration files
4Data migrations to transform existing rows during schema changes
5Still works in Django 1.6 and older projects requiring long-term maintenance

How Python Data Engineers Use These Tools

Flask-Migrate

Flask-Migrate is used in Flask-based data applications to manage database schema changes alongside application code. When a SQLAlchemy model changes, engineers run `flask db migrate` to generate a migration script and `flask db upgrade` to apply it — keeping the database schema in sync with the application model in a Git-tracked, reviewable workflow.

South

Engineers maintaining legacy Django projects running Django 1.6 or earlier use South to manage schema evolution. New projects should use Django's built-in migrations instead. For teams upgrading legacy codebases, South migrations can be converted to Django native migrations using the `manage.py migrate --run-syncdb` workflow.

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Alembic vs South

Individual Tool Pages

View Flask-Migrate details →View South details →

Side-by-Side Comparison

Flask-Migrate

South

Flask-Migrate

South

Best For

✓Managing SQLAlchemy migrations in Flask applications via a thin Alembic integration layer
✓Flask projects that want Alembic migration commands exposed through the Flask CLI
✓Teams already using Flask and SQLAlchemy who want minimal extra configuration

✓Historical Django schema migrations for codebases running Django 1.6 or earlier
✓Maintaining very legacy Django projects that have not been upgraded in over a decade
✓Understanding Django migration history — South directly inspired the built-in migrations system

Best For

✓Managing SQLAlchemy migrations in Flask applications via a thin Alembic integration layer
✓Flask projects that want Alembic migration commands exposed through the Flask CLI
✓Teams already using Flask and SQLAlchemy who want minimal extra configuration

✓Historical Django schema migrations for codebases running Django 1.6 or earlier
✓Maintaining very legacy Django projects that have not been upgraded in over a decade
✓Understanding Django migration history — South directly inspired the built-in migrations system

Weaknesses

•Thin wrapper around Alembic that adds little beyond CLI convenience
•Inherits all Alembic limitations: auto-generation needs review, merge conflicts require care
•Only relevant inside a Flask and SQLAlchemy stack — no standalone use case

•Completely obsolete — Django's built-in migrations superseded South in Django 1.7 (2014)
•Not compatible with Django 2.x or any later version
•No active maintenance or security updates; should be removed from any active codebase

Weaknesses

•Thin wrapper around Alembic that adds little beyond CLI convenience
•Inherits all Alembic limitations: auto-generation needs review, merge conflicts require care
•Only relevant inside a Flask and SQLAlchemy stack — no standalone use case

•Completely obsolete — Django's built-in migrations superseded South in Django 1.7 (2014)
•Not compatible with Django 2.x or any later version
•No active maintenance or security updates; should be removed from any active codebase

License

MIT

Apache-2.0

License

MIT

Apache-2.0

Install

pip install flask-migrate

pip install South

Install

pip install flask-migrate

pip install South

Rating

★ 4.5

★ 4.0

Rating

★ 4.5

★ 4.0

Key Features

Flask-Migrate

1Wraps Alembic to provide Flask CLI commands: `flask db init/migrate/upgrade`
2Auto-generates migrations by comparing SQLAlchemy models to live database
3Stores migration history in a `migrations/` directory under version control
4Supports multiple databases and bind configuration in Flask apps
5Rollback support via `flask db downgrade`

South

1Pre-Django-1.7 migration framework providing schema and data migrations
2Supports forward and backward migration for rollback capability
3Auto-detection of model changes to generate migration files
4Data migrations to transform existing rows during schema changes
5Still works in Django 1.6 and older projects requiring long-term maintenance

How Python Data Engineers Use These Tools