Dify
Open-source LLM app platform — visual workflow, RAG, agents, 100+ models.
Apache-2.0 platform with Prompt IDE, RAG pipelines, agent framework, and model management. Self-host with Docker or use cloud.dify.ai.
Anthropic is the AI company behind the Claude family of models, accessed through Anthropic's API or hosted apps like claude.ai. The models themselves are proprietary and closed-weight, and building on Anthropic's API means your application logic and model access depend on Anthropic's hosted infrastructure and pricing.
Dify is worth a look if what you actually want is an open-source application layer for building on top of LLMs — including Anthropic's own models via API — with visual workflows, RAG, and agent tooling you can self-host instead of building from scratch.
FAQ
Is there a free, open-source alternative to Anthropic's platform tooling?
Dify is open source (Apache-2.0 with additional conditions) and self-hostable, though note it's an application-building layer that can still call Anthropic's models via API — it's not a replacement for the models themselves.
What's the best open-source alternative to Anthropic's app-building tools?
Dify is the strongest pick if you want a self-hosted platform for building LLM apps, agents, and RAG pipelines that can connect to Anthropic's or other providers' models.
What are the top open-source alternatives to Anthropic's platform tooling?
Browse all open-source alternatives to Anthropic above, or explore the full Developer Tools category for more options.