Langflow Core

langflow-core is Langflow's service-complete, provider-bundle-free application profile. It combines langflow-base[complete], the Langflow application server and web UI, and Langflow's built-in core components. It does not depend on provider extension distributions such as lfx-openai, lfx-ibm, or lfx-bundles.

Install and run it with:

python -m pip install langflow-core
langflow run

The langflow-core command is an alias for the same launcher:

langflow-core run

For voice mode, install the audio dependencies:

python -m pip install "langflow-core[audio]"

For PostgreSQL support, install the optional extra:

python -m pip install "langflow-core[postgresql]"

The distribution depends on langflow-base[complete] for Langflow's API, services, persistence, web UI, and service-level optional dependencies. It also includes the lfx execution engine transitively through langflow-base. It does not install any distribution whose name starts with lfx-.

Provider components remain independently installable. For example, add OpenAI components to an existing core environment with:

python -m pip install lfx-openai

The full langflow distribution consumes langflow-core and adds Langflow's curated provider bundle set. langflow-core is the sole owner of the langflow command, so full installations use the same launcher without installing a duplicate console script. Install langflow-core directly when you want to choose provider bundles yourself.

langflow-core is not Langflow's smallest package profile. Use the modular langflow-base package when you need a smaller dependency surface or lower-level control over service extras, or use lfx when you need the headless execution engine without the Langflow application server and UI.