Vellum suits individuals looking for an AI assistant to handle personal tasks across files, calendars, email, code, and computer controls.
Free plan Open source From $30 a month AndroidiPhone & iPadWebWindowsMacBrowser extension+2
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Best Tool Calling 2026
Facts read 22 Sep 2026 – 21 Oct 2026
This list covers tool-calling software for buyers comparing ways to connect AI systems with tools. It helps you check plans, deployment choices, controls and operational features before you choose a product.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 Vellum | Vellum suits individuals looking for an AI assistant to handle personal tasks across files, calendars, email, code, and computer controls. | 6.4 | $30 a month | Free plan | Android, iPhone & iPad, Web, Windows | 15 Oct 2026 |
| 02 Liner | Liner may suit researchers who need paper discovery and comparison, or professionals who want cited search and writing tools. | 6.1 | $14.99 a month, billed yearly | Free plan | Android, iPhone & iPad, Web, Windows | 15 Oct 2026 |
| 03 Dify | Dify suits teams building AI applications that need configurable workflows, knowledge retrieval or multiple publishing options. | 6.0 | $590 a year | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 04 Inngest | Inngest suits developers building event-driven workflows, background jobs, or agents who need durable execution and traces. | 5.8 | $99 a month | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 05 Flowise | Flowise suits developers and teams building agent or LLM workflows who want visual orchestration, deployment choices, and developer access. | 5.4 | $35 a month | Free plan | Web, Windows, Mac, Linux | 1 Oct 2026 |
| 06 agentgateway | It suits platform teams and tool-builders managing model, MCP, or agent traffic in self-hosted environments. | 5.3 | Free plan | Free plan | Web, Windows, Mac, Linux | 19 Oct 2026 |
| 07 Rasa | 5.3 | Free plan | Free plan | Web, Windows, Mac, Linux | 21 Oct 2026 | |
| 08 LLM Gateway | LLM Gateway suits product and platform teams routing model requests across providers. | 5.2 | Free plan | Free plan | Web, Linux, Browser extension, API | 15 Oct 2026 |
| 09 Inference Gateway | 4.8 | Free plan | Free plan | Web, Windows, Mac, Linux | 10 Oct 2026 | |
| 10 Langflow | 4.7 | Free plan | Free plan | Web, Windows, Mac, Linux | 30 Sep 2026 |
The finder puts newest releases first. It uses figures the makers publish and does not score products. Compare free plans, paid starting prices, protocol support, deployment, tool-choice control, parallel tool calls, structured outputs, authentication methods and call observability.
02
Liner
Liner may suit researchers who need paper discovery and comparison, or professionals who want cited search and writing tools.
AndroidiPhone & iPadWeb+4 Record6.1 Visit
03
Dify
Dify suits teams building AI applications that need configurable workflows, knowledge retrieval or multiple publishing options.
WebWindowsMac+4 Record6.0 Visit
04
Inngest
Inngest suits developers building event-driven workflows, background jobs, or agents who need durable execution and traces.
WebWindowsMac+3 Record5.8 Visit
05
Flowise
Flowise suits developers and teams building agent or LLM workflows who want visual orchestration, deployment choices, and developer access.
WebWindowsMac+3 Record5.4 Visit
6
agentgateway
WebWindowsMac+3 Free plan Record5.3 Visit It suits platform teams and tool-builders managing model, MCP, or agent traffic in self-hosted environments.
8
LLM Gateway
WebLinuxBrowser extension+2 Free plan Record5.2 Visit LLM Gateway suits product and platform teams routing model requests across providers.
12
Pipedream
WebAPI $99 a month, billed yearly Record4.7 Visit Pipedream suits teams connecting services for AI agents or building automated workflows with code or drag-and-drop tools.
Before you choose
Start with the plan
Check whether a product has a free plan, a free trial or a paid starting price. Pricing notes can differ between free, freemium and paid models.
Read the listed price and billing unit before comparing offers. A free plan and a free trial serve different needs.
Match your platform
Choose a deployment that fits your setup.
If you need to run code on your own systems, check for self-hosted support and review the product's deployment details.
Check call controls
Compare protocol support, tool-choice control and parallel tool calls. These fields show how a product handles tool selection and concurrent calls.
Use the structured outputs field when your workflow needs responses in a defined format.
Review access and visibility
Authentication methods indicate how access can be managed. Call observability indicates what visibility the product provides into calls.
If open-source code matters, look for that offering and confirm its licence before adopting it.
Questions
What does this tool-calling list compare?
It compares free plans, paid starting prices, protocol support, deployment, tool-choice control, parallel tool calls, structured outputs, authentication methods and call observability.
Can I try a tool-calling product for free?
Yes. Products on the list offer free plans or free trials. Check the pricing note for the specific product.
Which deployment options appear here?
The listed deployment options include web, API, self-hosted, Windows, macOS and Linux.
Are open-source tool-calling products included?
Yes. Open-source code is offered by products on this list. Check the product details and licence before using the code.
How are products ordered?
The finder orders products by newest releases first, using figures the makers publish. It does not score products.
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