Alternatives / LangChain
Looking for an open source LangChain alternative? We compared 7 open source tools around agents, memory, observability, and AI frontends by license, self-hosting, and maintenance. Only Agno is a direct agent framework; the others replace parts of the stack such as memory, tracing, or the user interface.
Written by Maxime DERAME
Last updated:
| Alternative | Best for | License |
|---|---|---|
| Mem0 | Persistent memory for agents | Apache-2.0 |
| Agno | Agent framework and platform | Apache-2.0 |
| CopilotKit | React toolkit for agent interfaces | MIT |
| Langfuse | Tracing, evals, and prompt management | MIT + ee folders |
| Arize Phoenix | OpenTelemetry tracing and evaluation | Elastic License 2.0 (source available) |
| Helicone | LLM logging, monitoring, and routing | Apache-2.0 |
| Laminar | Tracing and evals for agents | Apache-2.0 |
We looked for open-source tools that replace parts of what LangChain provides: agent building, memory, tool integration, and tracing. We verified each project's license, recent activity, stars, and self-hosting in its repository, and note that several integrate with LangChain instead of replacing it. See our methodology for the full criteria.
Agno is the only one that is itself an agent framework. Mem0 is a memory layer, CopilotKit builds the frontend for agents, and Langfuse, Arize Phoenix, Helicone, and Laminar are observability tools. Several of them integrate with LangChain and LangGraph.
Agno is a framework and platform for building, deploying, and monitoring agents, model-agnostic, with memory, knowledge, and tool integrations. Mem0 adds persistent memory across sessions with Python and Node.js SDKs.
Langfuse covers tracing, evaluations, prompt management, and analytics. Arize Phoenix is built on OpenTelemetry, Helicone adds logging and routing, and Laminar offers tracing, online evals, and datasets.
Arize Phoenix uses the Elastic License 2.0, which prevents offering it as a managed service. Langfuse has enterprise features in separate directories.
Mem0, Agno, Helicone, and Laminar are Apache-2.0. CopilotKit is MIT. Langfuse is MIT with enterprise directories. Arize Phoenix is Elastic License 2.0.
All seven had commits within days of this update.
LangChain is itself open source, but teams look elsewhere because of its abstraction layers and fast-changing APIs, and its commercial LangSmith product for tracing and evaluation is hosted. These tools focus on narrower jobs, which can be simpler to adopt, but you assemble the stack yourself.
Mem0 is an Apache-2.0 memory layer that stores and retrieves context across AI agent sessions, with Python and Node.js SDKs and a managed API or self-hosted option. It is a memory component, not a framework for building agents or a general vector database.
Pricing: Free to self-host; managed platform is paid.
Agno is more of an AI agent platform than a direct Kiro replacement. It provides memory, knowledge integration, tools, monitoring, and deployment capabilities for production AI agents.
Pricing: Open source and self-hostable; hosted services may be offered separately.
CopilotKit is an MIT toolkit of React components and protocols for embedding AI copilots and agent interfaces into applications. It works alongside agent frameworks such as LangGraph rather than replacing them, so it covers the frontend side of an AI app.
Pricing: Free and open source; hosted cloud is optional.
Langfuse is an open-source LLM engineering platform with tracing, evaluations, prompt management, datasets, and analytics for debugging and improving LLM applications, working with many frameworks and available self-hosted or as a cloud service. The repository is MIT, except for the ee folders, which are under a separate license, and the project is maintained by ClickHouse.
Pricing: Free to self-host; Langfuse Cloud has a free tier and paid plans.
Arize Phoenix is an open-source platform for LLM tracing, evaluation, and optimization, with automatic instrumentation for many frameworks, datasets, experiments, and a prompt playground, and it can be self-hosted. It is licensed under the Elastic License 2.0, which is source available and prohibits offering it as a managed service.
Pricing: Free to self-host; Arize offers paid hosted plans.
Helicone is an open-source platform for logging, monitoring, and debugging LLM applications through a proxy, with request logging, cost and latency tracking, caching, routing, a prompt playground, and datasets, under Apache-2.0. A production Helm chart is available for enterprise workloads on request.
Pricing: Free to self-host; hosted plans are paid.
Laminar is an Apache-2.0 observability platform for AI agents that collects traces and supports online evaluations and datasets. It can be self-hosted and is not a vector database or an agent framework.
Pricing: Free to self-host; managed cloud is paid.
| Alternative | Type | License | Self-hosted | Replaces |
|---|---|---|---|---|
| Mem0 | Memory layer | Apache-2.0 | Yes | Memory components |
| Agno | Agent framework | Apache-2.0 | Yes | Core agent code |
| CopilotKit | Frontend toolkit | MIT | Yes | UI for agents |
| Langfuse | Observability | MIT + ee directories | Yes | LangSmith |
| Arize Phoenix | Observability | Elastic License 2.0 | Yes | LangSmith |
| Helicone | Observability | Apache-2.0 | Yes | LangSmith |
| Laminar | Observability | Apache-2.0 | Yes | LangSmith |
Want an agent framework instead of LangChain
Agno is model-agnostic and includes memory, knowledge, and tool integrations.
Want persistent memory for agents
Mem0 stores and retrieves context across sessions with Python and Node.js SDKs.
Want a replacement for LangSmith
Langfuse provides tracing, evaluations, prompt management, and datasets.
Want agent UIs in React
CopilotKit offers React components that work with LangGraph agents.