What is the best AI tool for building ai agents?

On AIToolMaps, AgentTrafficCop ranks first for building ai agents, followed by Tess and PhoneUse. The ranking weighs how central the job is to each tool, how complete and checked its listing is, and what members upvote, save and review.

Is there a free AI tool for building ai agents?

Yes. 17 of the 20 tools listed for building ai agents have a free plan or are free to use, including AgentTrafficCop, Make and Gumloop.

Which AI tools for building ai agents have an API?

19 of them offer an API for developers, including AgentTrafficCop, Tess and PhoneUse.

Can I do building ai agents on my phone?

Yes. 4 of the tools have an iPhone or Android app, including PhoneUse, Chatbase and Crisp.

Task · Agents & Automation

Best AI tools for building ai agents

Ranked by how central this job is to each tool, how complete and checked its listing is, and what members upvote, save and review.

Tools: 20
Free options: 17
Updated: Nov 4

Sort

1
AgentTrafficCopVerified Nov 3, 2026
Runtime circuit breaker for developers that stops multi-agent AI systems from looping and overspending
Free tier · from $49/moAPI
Visit
2
TessVerified Nov 4, 2026
AI workforce platform for teams that need governed agents with memory, budgets, and approvals.
Paid · from $20.83/moAPI
Visit
3
PhoneUseVerified Nov 3, 2026
Gives AI agents a cloud or real phone so they can use mobile apps and read SMS codes.
Paid · from $20/moAndroid, iOS, API, Command line
Visit
4
MakeVerified Nov 4, 2026
Lets teams build, run, and monitor AI agents and app-to-app automations in a visual workspace.
Free tier · from $12/moAPI
Visit
5
GumloopVerified Nov 4, 2026
Lets teams build and share AI agents that carry out work across their business apps and the web.
Free trial · from $37/moWeb
Visit
6
Relevance AIVerified Nov 4, 2026
A platform for teams to build, run and monitor AI agents and multi-agent workflows.
Free tierAPI
Visit
7
VoiceflowVerified Nov 4, 2026
A platform for support and CX teams to build, test, and deploy AI agents across chat and voice.
Pay as you goWeb, API
Visit
8
ZapierVerified Nov 3, 2026
Automation platform that connects apps and AI tools so teams can run and govern workflows.
Free tier · from $19.99/moAPI
Visit
9
n8nVerified Nov 3, 2026
n8n is a visual workflow platform for teams connecting apps, adding AI steps, and keeping automations auditable.
Free trialAPI, Command line
Visit
10
OpenRouterVerified Nov 4, 2026
One API endpoint for calling many AI models from different providers, with automatic fallback
Free tierWeb, API
Visit
11
ActivepiecesVerified Nov 4, 2026
Open-source automation platform where teams build AI agents and workflows by describing them in chat.
Free tier · from $20/moWeb
Visit
12
Retell AIVerified Nov 4, 2026
Build and run AI voice agents that answer and place phone calls for support, sales, and scheduling teams.
Pay as you goWeb, API
Visit
13
Hugging FaceVerified Nov 3, 2026
Hosts, shares and runs machine learning models, datasets and demo apps for AI developers and teams.
Free tier · from $9/moWeb, API, Command line
Visit
14
NotionVerified Nov 3, 2026
A connected workspace for team notes, projects, and knowledge, with AI and agents built in.
Free tier · from $10/moAPI
Visit
15
Base44Verified Nov 4, 2026
Build apps, websites and AI agents by describing them in plain language, with no coding required.
Free tier · from $16/moWeb
Visit
16
BotpressVerified Nov 4, 2026
Build AI support agents that resolve tickets and take actions like refunds, without code.
Free tier · from $150/moWeb, API
Visit
17
ChatbaseVerified Nov 4, 2026
Builds AI support and sales agents trained on your own content for chat, email, and voice.
Free trial · from $40/moWeb, API, iOS, Android, Command line
Visit
18
CrispVerified Nov 4, 2026
Crisp is a customer support platform with a shared inbox, website chat, and no-code AI agents for support teams.
Free tier · from $45/moWeb, iOS, Android
Visit
19
Sarvam AIVerified Nov 4, 2026
Sarvam AI gives developers speech, translation, and document APIs for Indic-language products.
Pay as you goWeb, API
Visit
20
HubSpotVerified Nov 4, 2026
A connected CRM and marketing, sales, and service platform for growing businesses.
Free tier · from $7/moWeb, iOS, Android
Visit

How to choose

What differs most is what each tool is built around. Make and Zapier are no-code automation platforms: Make emphasizes a visual canvas, prompt or chat building, and team governance, while Zapier centers on Zaps, app connections, AI steps, MCP, and a free plan with tasks. n8n also uses a visual editor but adds code steps, step-level debugging, and self-hosting. OpenRouter is not a workflow builder; it gives one API endpoint to many models with fallback, useful when model choice matters. Hugging Face hosts models, datasets, and demo apps with inference endpoints, while Notion combines documents, databases, and AI agents in a workspace. Weigh free plan or trial, whether you need API, CLI, or self-hosting, how much governance and audit access you need, and whether pricing follows credits, tasks, executions, or hourly hardware.

Automating repetitive tasks Automating workflows between apps Answering customer support Building chatbots for your website Adding human approval to AI workflows Monitoring automation runs Using LLM APIs Answering phone calls

Common questions

What is the best AI tool for building ai agents?: On AIToolMaps, AgentTrafficCop ranks first for building ai agents, followed by Tess and PhoneUse. The ranking weighs how central the job is to each tool, how complete and checked its listing is, and what members upvote, save and review.
Is there a free AI tool for building ai agents?: Yes. 17 of the 20 tools listed for building ai agents have a free plan or are free to use, including AgentTrafficCop, Make and Gumloop.
Which AI tools for building ai agents have an API?: 19 of them offer an API for developers, including AgentTrafficCop, Tess and PhoneUse.
Can I do building ai agents on my phone?: Yes. 4 of the tools have an iPhone or Android app, including PhoneUse, Chatbase and Crisp.