Best Open Source Alternatives to LangChain

Compare the best free and open-source alternatives to LangChain — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated November 2026 · 7 alternatives

LangChain

Proprietary SaaS

LangChain alternatives compared

Open-source alternatives to LangChain, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
Mem0	68,337	Apache-2.0	Web	No	Oct 2026	Visit
LiteLLM	62,633	—	Web	No	Nov 2026	Visit
Agno	43,033	Apache-2.0	Web	No	Nov 2026	Visit
CopilotKit	38,489	MIT	Web	No	Nov 2026	Visit
Supermemory	31,518	MIT	DockerLinux	Yes	Nov 2026	Visit
Letta	25,331	Apache-2.0	Web	No	Oct 2026	Visit
Laminar	3,472	Apache-2.0	DockerLinux	Yes	Nov 2026	Visit

Top open-source LangChain alternatives

Mem068,337Apache-2.0

Mem0 provides self-hosted long-term memory for AI agents, replacing manual vector pipelines with automated fact extraction and cross-session persistence.

Web

vs LangChain: a free, open-source option you fully control, licensed Apache-2.0.

Visit Details

LiteLLM62,633

LiteLLM is a self-hosted AI gateway replacing OpenRouter with a unified OpenAI-compatible API, spend tracking, and private VPC deployment.

Web

vs LangChain: a free, open-source option you fully control.

Visit Details

Agno43,033Apache-2.0

Agno replaces commercial agent platforms and LangChain stacks with a self-hosted Python runtime, PostgreSQL memory, and zero per-trace SaaS fees.

Web

vs LangChain: a free, open-source option you fully control, licensed Apache-2.0.

Visit Details

CopilotKit38,489MIT

Open-source frontend SDK for AI agents and Generative UI with shared state, human-in-the-loop workflows, and multi-framework support via AG-UI.

Web

vs LangChain: a free, open-source option you fully control, licensed MIT.

Visit Details

Supermemory31,518MIT

Supermemory provides a self-hosted AI memory engine that replaces manual vector search and LangChain pipelines with automated user fact extraction.

DockerLinux

vs LangChain: a free, open-source option you fully control, licensed MIT.

Visit Details

Best Open Source Alternatives to LangChain

LangChain

LangChain alternatives compared

Top open-source LangChain alternatives

The modern standard for Protobuf workflows

Mentoring for backend developers. Consulting for startups.

More alternatives to LangChain

Letta

Laminar