Comparing
Database migration tool for SQLAlchemy — tracks schema changes as versioned scripts.
Official MongoDB driver for Python — insert, query, update, and aggregate documents with a Pythonic API.
| Metric | alembic | pymongo |
|---|---|---|
| Ecosystem | Python | Python |
| Difficulty | Intermediate | Intermediate |
| Weekly downloads | 3.8M↑ | 3.5M |
| Latest version | v1.13.2 | v4.10.1 |
| Recipes | 2 | 2 |
alembic only
Shared
pymongo only
Any production SQLAlchemy app. Column additions/renames, index creation, constraint changes, data backfills as part of schema migrations.
Applications already using MongoDB, document-oriented data (nested objects, variable schemas), rapid prototyping where schema flexibility matters, storing unstructured data like logs or events.
Non-SQLAlchemy databases (use Flyway, Liquibase, or Django migrations). Throwaway dev DBs where you can afford to drop and recreate.
When you need strong ACID transactions across many documents (use PostgreSQL), when your data is highly relational, or when you want an ORM-style interface (use Motor + Beanie for async).
alembic
pymongo