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Best LLM Application Development Frameworks in 2026

LLM application development frameworks help you build software around language models, including retrieval, agents, tools and workflow graphs. This list helps developers compare implementation choices before selecting a framework.

  1. 01 Scanopy

    The maker presents Scanopy for homelabs, IT operations, MSPs, security and compliance teams, and platform and DevOps teams.

    From $11.99/mo Free plan Open source Web · Windows · macOS · Linux
    8.7 Visit Specs
  2. 02 Vellum

    Vellum suits an individual looking for an assistant that can handle files, calendars, email, code, and computer control.

    From $30/mo Free plan Open source Web · Windows · macOS · iOS
    8.6 Visit Specs
  3. 03 Flowise

    Flowise suits teams building agent or LLM workflows with visual tools, APIs, or self-hosted deployment.

    From $35/mo Free plan Web · Windows · macOS · Linux
    8.4 Visit Specs
  4. 04 LangChain

    It suits developers building configurable model-and-tool agents in Python or JavaScript/TypeScript.

    From $39/mo Free plan API · Self-hosted
    8.3 Visit Specs
  5. 05 OpenRAG

    OpenRAG suits teams building document-grounded assistants, legal search, or multimodal enterprise question answering.

    Free plan Web · API · Self-hosted
    8.3 Visit Specs
  6. 06 txtai

    It suits developers and teams building semantic search or language-model workflows who want local operation or self-managed deployment.

    Free plan Windows · macOS · Linux · API
    8.3 Visit Specs
  7. 07 Haystack

    Haystack is built for AI developers and engineers creating modular, transparent systems, including agent workflows, RAG and multimodal applications.

    Free plan API · Self-hosted
    8.2 Visit Specs
  8. 08 CrewAI AMP
    Free plan Web · API · Self-hosted
    8.0 Visit Specs
  9. 09 LlamaIndex

    LlamaIndex suits developers and enterprises building document-processing, retrieval and knowledge-work workflows.

    From $50/mo Web · Linux · API · Self-hosted
    7.7 Visit Specs
  10. 10 DSPy
    API · Self-hosted
    7.6 Visit Specs
  11. 11 Langflow
    Web · Windows · macOS · Linux
    7.6 Visit Specs
  12. 12 Vercel

    Vercel suits teams deploying web applications from connected Git repositories and using its listed frameworks and delivery infrastructure.

    From $20/mo Free plan Web · API
    7.6 Visit Specs
  13. 13 Pathway Live Data Framework

    It suits teams building Python or SQL analytics, ETL, or AI pipelines that must combine batch and live data.

    Free plan API · Self-hosted
    7.5 Visit Specs
  14. 14 AgentScope
    Web · Windows · macOS · Linux
    6.3 Visit Specs
  15. 15 Apache Burr
    Windows · macOS · Linux
    6.2 Visit Specs
  16. 16 AutoGen
    Windows · macOS · Linux
    6.1 Visit Specs
  17. 17 AWS Strands Agents
    Windows · macOS · Linux
    6.1 Visit Specs
  18. 18 Genkit
    Web · Windows · macOS · Linux
    6.1 Visit Specs
  19. 19 Agno
    Web
    6.0 Visit Specs
  20. 20 BAML
    Web
    6.0 Visit Specs
  21. 21 Letta
    Web · Windows · macOS · Linux
    6.0 Visit Specs
  22. 22 AG2
    5.9 Visit Specs
  23. 23 LangChain4j
    Windows · macOS · Linux
    5.9 Visit Specs
  24. 24 LMQL
    Web · Windows · macOS · Linux
    5.9 Visit Specs
  25. 25 CAMEL-AI
    5.8 Visit Specs
How this list is ordered. Specifiction scores each tool on how fully its maker documents it, whether its prices are published, where the research puts it, the platforms it runs on and whether it can be tried for free (how we rank). Makers can also buy a numbered place (how Specifiction is paid for).

Check the published free plan, paid-from price, primary language, RAG support, agent and tool use, workflow graphs, prompt optimization, open-source license and JavaScript or TypeScript SDK support.

Compare Scanopy and Vellum Get a place on this list

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