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Best LLM Application Development Frameworks in 2026

Frameworks for LLM applications let you create software that uses language models. They may provide RAG, agent and tool calling, workflow graphs, prompt tuning, and JavaScript or TypeScript SDK options.

  1. 1

    Scanopy

    Free plan Open source APILinuxMac+3

    Scanopy focuses on documenting network assets and relationships, with self-hosted and cloud options and plan-dependent sharing tools.

    8.6 Free plan · paid from $11.99/mo (annual) · 14-day trial Visit site
  2. 2

    Vellum

    Free plan Open source AndroidAPIExtension+5

    Vellum offers a personal assistant with saved context, skills, integrations and approval controls.

    8.5 Free plan · paid from $30/mo Visit site
  3. 3

    Flowise

    Free plan APILinuxMac+3

    Flowise offers visual workflow construction, integrations, and deployment options, but its wind-down is a central consideration.

    7.5 Free plan · paid from $35/mo Visit site
  4. 4

    CrewAI AMP

    Free plan APISelf-hostedWeb

    Choose CrewAI AMP if your team needs several ways to build multi-agent workflows alongside tracing and governance controls.

    7.4 Free plan Visit site
  5. 5

    LlamaIndex

    Free plan APILinuxSelf-hosted+1

    LlamaIndex combines document parsing, extraction, classification, and retrieval pipelines for teams building document-centered AI workflows.

    7.3 Free plan · paid from $50/mo Visit site
  6. 6

    Haystack

    Free plan APISelf-hosted

    Haystack provides a free framework for assembling AI systems from modular pipelines, with integrations and self-hosted deployment options.

    7.2 Open source Visit site
  7. 7

    LangChain

    Free plan APISelf-hosted

    Choose LangChain to build agents around models and tools using its configurable harness, middleware, and wide range of integrations.

    7.1 Free plan Visit site
  8. 8

    Langflow

    Free plan APILinuxMac+3

    Langflow offers visual workflow building alongside Python extensibility, API use, and agent and MCP support. Its execution and isolation model requires care, particularly for multi-tenant deployments.

    7.1 Free plan Visit site
  9. 9

    DSPy

    Free plan APISelf-hosted

    Choose DSPy if you are building AI programs in Python and want task signatures, composable modules, and prompt optimization.

    7.0 Open source Visit site
  10. 10

    OpenRAG

    Free plan APISelf-hostedWeb

    OpenRAG combines document retrieval, source-linked answers and self-managed deployment in a free framework.

    7.0 Free plan Visit site
  11. 11

    txtai

    Free plan APILinuxMac+2

    txtai brings search, language model pipelines, workflows, and agents into one open-source framework.

    7.0 Open source Visit site
  12. 12

    Pathway Live Data Framework

    Free plan APISelf-hosted

    Choose Pathway if you need Python or SQL pipelines that combine live data processing with analytics or AI tooling.

    6.8 Free plan Visit site
  13. 13

    AgentScope

    Free plan LinuxMacWeb+1
    6.6 Free plan Visit site
  14. 14

    Vercel

    by Vercel
    Free plan APIWeb

    Vercel brings deployment, delivery, framework support, and security features together for apps and agents. Check the Hobby restrictions and Pro usage terms before choosing a plan.

    6.6 Free plan · paid from $20/user/mo · 14-day trial Visit site
  15. 15

    Apache Burr

    Free plan LinuxMacWindows
    6.4 Free plan Visit site
  16. 16

    AutoGen

    Free plan LinuxMacWindows
    6.4 Free plan Visit site
  17. 17

    AWS Strands Agents

    Free plan LinuxMacWindows
    6.4 Free plan Visit site
  18. 18

    Genkit

    Free plan LinuxMacWeb+1
    6.4 Free plan Visit site
  19. 19

    Letta

    Free plan LinuxMacWeb+1
    6.3 Free plan · paid from $20/mo Visit site
  20. 20

    BAML

    Free plan Web
    6.2 Free plan Visit site
  21. 21

    LangChain4j

    Free plan LinuxMacWindows
    6.2 Free plan Visit site
  22. 22

    LMQL

    Free plan LinuxMacWeb+1
    6.2 Free plan Visit site
  23. 23

    NVIDIA NeMo Guardrails

    Free plan LinuxMacWindows
    6.2 Free plan Visit site
  24. 24

    Agno

    Free plan Web
    6.1 Free plan · paid from $150/mo · 14-day trial Visit site
  25. 25

    Langroid

    Free plan LinuxMacWindows
    6.1 Free plan Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Compare free access, starting prices, trial periods, main languages, supported platforms, and open-source licences. Before selecting one, verify support for Linux, Windows, macOS, web, API, or self-hosted deployment.

Questions

Are free plans available for these frameworks?

Some frameworks on the list include a free plan. Check the plan terms for the framework you are considering.

Do any of these frameworks publish open-source code?

Several listed tools provide open-source code. Review the licence for the framework you choose.

Can I try a framework before paying?

Some entries include a free trial; Agno specifies a 14-day trial.

Where can these frameworks run?

The list includes Linux, Windows, macOS, web, API, and self-hosted options. Confirm the platform support for your chosen tool.

Which comparison fields are provided?

Fields include free plan, paid-from price, primary language, RAG, agent and tool use, workflow graphs, prompt optimization, licence, and JavaScript or TypeScript SDK.

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