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Best Tool Calling in 2026

Tool-calling products connect an AI workflow with actions and services. Use this list to compare deployment choices, protocol support and control over tool selection.

  1. 01 Dify

    Dify suits teams building AI applications that need visual workflows, knowledge grounding, model connections, and multiple publishing options.

    From $49.17/mo Free plan Open source Web · Windows · macOS · Linux
    9.4 Visit Specs
  2. 02 Inngest

    Inngest suits developers building event-driven workflows, background jobs, or agents who need durable execution and observability.

    From $99/mo Free plan Open source Web · Windows · macOS · Linux
    9.2 Visit Specs
  3. 03 agentgateway

    It suits tool-builders, platform engineers, and AI enthusiasts working with service, model, MCP, or agent traffic.

    Free plan Open source Web · Windows · macOS · Linux
    9.1 Visit Specs
  4. 04 Liner

    Liner suits professionals who need cited AI search alongside academic research or AI-assisted writing.

    From $1.25/mo Free plan Web · Windows · macOS · iOS
    9.0 Visit Specs
  5. 05 LLM Gateway

    LLM Gateway suits product and platform teams routing requests across model providers, including teams that want to self-host the open-source core.

    Free plan Open source Web · Linux · API · Self-hosted
    8.6 Visit Specs
  6. 06 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
  7. 07 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
    8.5 Visit Specs
  8. 08 n8n
    From €20/mo Free plan Self-hosted
    8.4 Visit Specs
  9. 09 Rasa
    Free plan Open source Web · Windows · macOS · Linux
    8.4 Visit Specs
  10. 10 Kore.ai

    It suits large organizations building AI agents for workflows that cross teams, tools, and systems.

    Free trial Web · API · Self-hosted
    8.3 Visit Specs
  11. 11 Google Cloud API Gateway
    From $1.50/mo Web · API
    7.8 Visit Specs
  12. 12 Pipedream

    Pipedream suits developers and teams building API integrations or AI-agent workflows with code, no-code steps, or MCP tools.

    From $99/mo Free plan Web · API
    7.7 Visit Specs
  13. 13 Inference Gateway
    Web · Windows · macOS · Linux
    7.5 Visit Specs
  14. 14 Langflow
    Web · Windows · macOS · Linux
    7.5 Visit Specs
  15. 15 Amazon Bedrock Data AutomationAmazon Web Services
    From $0.01/mo API
    7.1 Visit Specs
  16. 16 Gravitee API Management
    From $2,500/mo Web · Windows · Linux
    7.0 Visit Specs
  17. 17 Kong AI Gateway
    Web
    6.2 Visit Specs
  18. 18 MCP Gateway
    Web
    5.4 Visit Specs
  19. 19 Santeon
    Web
    5.3 Visit Specs
  20. 20 Toolhouse
    Web
    5.2 Visit Specs
  21. 21 ToolRoute
    Web
    5.2 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).

Before choosing, check the free plan or paid entry point, supported platform, authentication methods, structured outputs, parallel calls and call observability.

Compare Dify and Inngest Get a place on this list

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