The Best Tool Calling in 2026
We researched tool calling products from official websites, including pricing pages, plan tables, and product documentation. Rankings reflect each product’s core function-execution capabilities, value for money, and verifiable features, helping teams compare platforms for dependable model-to-tool workflows.
Our top picks
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Top ranked
Santeon#1 of 218.6/10Connect MCP servers, govern agent workflows, and publish workflows as callable MCP tools.
Pricing on request
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Runner-up
Flowise#2 of 218.4/10Visual agent building with tool calling, now archived after official operations ended.
Free plan
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Top-ranked free plan
Langflow#3 of 218.3/10A visual, open-source flow builder for tool-using agents, RAG, and deployment.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 21 tools, best first
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Best forOrganizations publishing governed workflows as MCP tools
Connect MCP servers, govern agent workflows, and publish workflows as callable MCP tools.
- Structured outputs
- Call observability
Pricing on request Our Santeon verdict → Visit SanteonFor vendors Sponsor this spot · #1 · $149/mo →8.6/10★★★★☆Visit Santeon -
Best forBuilders assessing visual tool-calling workflows
Visual agent building with tool calling, now archived after official operations ended.
8.4/10★★★★☆Visit Flowise -
Best forOpen-source teams building visual tool-using agents
A visual, open-source flow builder for tool-using agents, RAG, and deployment.
8.3/10★★★★☆Visit Langflow -
Best forTeams building visual agents with MCP-compatible tools
A visual agent builder with MCP-compatible tools, self-hosting, and a free plan.
8.2/10★★★★☆Visit Dify -
Best forEnterprises governing AI, MCP, and A2A traffic
A gateway for governing AI and tool traffic across models, with routing and spend controls.
8.1/10★★★★☆Visit Kong -
Best forBedrock users extracting structured media data
A multimodal extraction service for Bedrock workflows, not a tool-calling product.
7.9/10★★★★☆Visit AWS -
Best forTeams needing a hosted, multi-protocol tool router
A hosted router that executes third-party tools across MCP, A2A, and OpenAI formats.
- Call observability
7.9/10★★★★☆Visit ToolRoute -
Best forEnterprises managing MCP tools and access
A self-hosted MCP gateway for centralized tool discovery, access control, and observability.
- Structured outputs
- Call observability
7.9/10★★★★☆Visit MCP Gateway -
Best forDevelopers routing calls across hosted and local LLMs
A self-hosted, OpenAI-compatible gateway with MCP tools and provider routing.
7.9/10★★★★☆Visit site -
Best forTeams routing provider calls with budget controls
A routing and cost-control layer for teams using multiple LLM providers.
7.9/10★★★★☆Visit LLM Gateway -
Best forTeams running self-hosted MCP and A2A gateways
A self-hosted gateway for governing AI, MCP, and A2A traffic—not choosing tools for agents.
7.8/10★★★★☆Visit agentgateway -
Best forUsers automating tasks across connected services
A flexible personal assistant for tool automation, not dedicated tool-calling infrastructure.
7.7/10★★★★☆Visit Vellum -
Best forDevelopers wiring app actions into event workflows
A developer-focused workflow platform that pairs app integrations with code-level control.
7.6/10★★★★☆Visit Pipedream -
Best forTeams connecting tool actions inside workflows
A flexible workflow builder for connecting tools, APIs and code—not a dedicated tool-calling product.
7.5/10★★★★☆Visit n8n -
Best forDevelopers running durable event-driven functions
A durable execution platform for event-driven functions, not a tool-calling specialist.
7.4/10★★★★☆Visit Inngest -
Best forEnterprises building custom conversational agents
Build conversational agents with custom actions, dialogue orchestration, and self-managed deployment.
7.3/10★★★★☆Visit Rasa -
Best forEnterprises adding integrations to virtual assistants
A low-code assistant platform with broad integrations, multichannel delivery, and human handoff.
7.2/10★★★★☆Visit Kore.ai -
Best forBusinesses delegating tool tasks to managed AI workers
Delegate multi-step business tasks to AI workers, with plans starting at $500 per month.
- Call observability
7.1/10★★★★☆Visit Toolhouse -
Best forEnterprises managing APIs across gateways
Broad API governance and gateway management, priced for organizations with larger needs.
7.0/10★★★★☆Visit Gravitee -
Best forGoogle Cloud users exposing governed APIs
A cloud API gateway for teams that need governed access to Google Cloud-backed services.
6.8/10★★★☆☆Visit Google Cloud -
Best forResearchers who need cited answers and MCP access
A cited-answer research platform with API and MCP access, not a tool-execution-first product.
6.5/10★★★☆☆Visit Liner
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Score |
|---|---|---|---|---|
| 1 | Santeon | 8.6 | ||
| 2 | Flowise | Yes | $35/mo | 8.4 |
| 3 | Langflow | Yes | Free | 8.3 |
| 4 | Dify | Yes | 8.2 | |
| 5 | Kong AI Gateway | No | 8.1 | |
| 6 | Amazon Bedrock Data Automation | $0.005/unit usage-based | 7.9 | |
| 7 | ToolRoute | Yes | $29/mo | 7.9 |
| 8 | MCP Gateway | 7.9 | ||
| 9 | Inference Gateway | Yes | Free | 7.9 |
| 10 | LLM Gateway | Yes | 7.9 | |
| 11 | agentgateway | Yes | Free | 7.8 |
| 12 | Vellum | Yes | 7.7 | |
| 13 | Pipedream | 7.6 | ||
| 14 | n8n | Yes | €20/mo | 7.5 |
| 15 | Inngest | Yes | $99/mo | 7.4 |
| 16 | Rasa | Yes | 7.3 | |
| 17 | Kore.ai | 7.2 | ||
| 18 | Toolhouse | No | $500/mo | 7.1 |
| 19 | Gravitee API Management | Yes | $2,500/mo | 7.0 |
| 20 | Google Cloud API Gateway | Yes | $1.50/unit/mo | 6.8 |
| 21 | Liner | Yes | $14.99/user/mo | 6.5 |
Head-to-head All 25 comparisons →
- Santeon vs Flowise
- Santeon vs Langflow
- Santeon vs Dify
- Santeon vs Kong AI Gateway
- Santeon vs Amazon Bedrock Data Automation
- Santeon vs ToolRoute
- Santeon vs MCP Gateway
- Flowise vs Kong AI Gateway
- Flowise vs Amazon Bedrock Data Automation
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How we rank tool calling
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update