Side by side
| PICK | PRICE OR LIMIT | VERDICT | NEED |
|---|---|---|---|
| n8n | Starter EUR 20 a month billed annually, 2,500 executions; Community Edition free to self-host | Start here | Complex workflows with full control |
| Zapier Agents | Free 400 activities a month; Pro USD 33.33 a month billed annually, 1,500 activities | Easiest first agent | A no-code agent for everyday tasks |
| Microsoft Copilot Studio | Included with Microsoft 365 Copilot at USD 30 a user a month, paid yearly; packs USD 200 a month for 25,000 credits | Best for Microsoft shops | Agents inside Teams and Microsoft 365 |
| OpenAI Agents SDK | MIT-licensed SDK; model usage billed by your API provider | Best for developers | Agents in your own application code |
| Gemini Enterprise | 30-day no-cost trial of the Plus edition; prices Not listed | Best for Google Cloud | One agent across Google Cloud and work apps |
Our picks in detail
n8n
Per-execution pricing and a free self-hosted edition; expect a learning curve
- Best for: operations, IT and engineering teams automating multi-step processes where an AI agent makes decisions inside a larger workflow.
- Main limitation: the Business plan, with SSO and Git version control, is self-hosted only at EUR 667 a month billed annually, and hosted Starter allows 5 concurrent executions.
n8n Starter cost EUR 20 a month billed annually for 2,500 workflow executions, according to n8n's pricing page checked 18 October 2026.
Zapier Agents
The fastest start, with 9,000+ app connections and a free tier of 400 activities a month
- Best for: marketers, salespeople and operations staff who want an agent that works across their apps without writing code.
- Main limitation: Zapier counts each action an agent takes, including web browsing and knowledge lookups, as an activity, and the free plan stops at 400 a month.
Zapier Agents Free allowed 400 activities a month, and Agents Pro cost USD 33.33 a month billed annually, according to Zapier's pricing page checked 18 October 2026.
Microsoft Copilot Studio
Internal agents come with Microsoft 365 Copilot; external agents need credit packs
- Best for: organizations that run on Microsoft 365, Teams and Power Platform and want agents governed by the same admin tools.
- Main limitation: publishing an agent to a website, app or social channel, or letting unlicensed users use it, needs a standalone Copilot Studio plan, and pay-as-you-go requires an Azure subscription.
Microsoft Copilot Studio capacity packs cost USD 200 a month for 25,000 Copilot Credits, according to Microsoft's Copilot Studio pricing page checked 18 October 2026.
OpenAI Agents SDK
Open source and provider-agnostic; you build hosting, storage and approvals yourself
- Best for: developers who want agents in their own Python or TypeScript code, with tools, handoffs between agents, guardrails and tracing.
- Main limitation: your server owns deployment, tool implementations, storage and approval decisions, and OpenAI's visual Agent Builder is not a long-term alternative: OpenAI's deprecations page says it shuts down on 30 November 2026.
OpenAI's visual Agent Builder is scheduled to shut down on 30 November 2026, with the Agents SDK as a migration path, according to OpenAI's deprecations page checked 18 October 2026.
Gemini Enterprise
One agent across 100+ connectors; prices are quoted by sales
- Best for: companies on Google Cloud that want one agent working across Google Workspace, Microsoft 365, Slack, Salesforce and other business apps.
- Main limitation: the Gemini Enterprise page routes pricing through sales, and Google notes that some features, including background multi-step tasks and third-party model choice, are in early access.
Google offered Gemini Enterprise Plus at no cost for 30 days, and said customer data is never used to train its models, according to Google Cloud's Gemini Enterprise page checked 18 October 2026.
Reviewed 1 November 2026 against n8n, Zapier, Microsoft Copilot Studio, OpenAI and Google Cloud pricing pages and documentation.
Our pick
n8n wins because it combines a visual workflow editor with agent nodes, MCP support, code steps and human approval for tool calls, and its pricing stays predictable as agents get more complex. The n8n pricing page bills per workflow execution "regardless of complexity", so a run with 50 steps costs the same as a run with 2. Starter costs EUR 20 a month billed annually for 2,500 executions, Pro costs EUR 50 for 10,000, and every plan includes unlimited users, workflows and integrations. The self-hosted Community Edition on GitHub is free, which makes n8n the only pick here you can run entirely on your own servers without a sales call. The trade-off is that it rewards technical comfort: you will think in triggers, nodes and data.
Expect agents to fail some tasks
Build for supervision, not autonomy: today's agents finish only a share of real work on their own. Researchers built TheAgentCompany, a benchmark that simulates a software company with internal sites, data and coworkers, and found that the most competitive agent completed 30% of tasks autonomously. Simpler tasks were often solved, but long multi-step tasks stayed out of reach.
TheAgentCompany benchmark found the best-performing AI agent completed 30% of simulated workplace tasks autonomously, in its September 2025 revision.
Analysts expect many agent projects to stall for the same reason. Gartner predicted in June 2025 that over 40% of agentic AI projects will be canceled by the end of 2027, citing escalating costs, unclear business value and inadequate risk controls. Gartner also warned of "agent washing", estimating that only about 130 of the thousands of agentic AI vendors are real.
Permissions decide which AI agent builder fits
An agent that can read your inbox and send email can also be tricked into sending the wrong thing. OWASP ranks prompt injection first in its 2025 Top 10 for LLM applications, and notes that instructions hidden in a web page or file can change what an agent does. Its mitigations translate directly into agent builder settings:
- Least privilege. Connect only the apps and actions the task needs. A reporting agent needs read access, not delete.
- Human approval for high-risk actions. Use n8n's approval step, Copilot Studio's controls or the Agents SDK's human-in-the-loop for anything that sends, pays or deletes.
- Separate untrusted content. Treat web pages, emails and uploaded files as data, never as instructions.
- Test with hostile inputs before you connect real customer data.
No agent should be able to send money, delete records or email customers without a person approving the action.
How we picked
- We compared each builder's way of designing agents, its app connections, human approval and permission controls, hosting options, free and paid plan limits, and billing unit, as listed on each vendor's pricing and documentation pages on 18 October 2026. The order reflects how well each tool lets a small team build an agent it can control and afford, with published prices ranked above quoted ones. Our ranking method explains how documented limits shape each verdict.
How to choose
How to choose
Build the same small agent in two tools on their free plans or trials:
- Pick one repetitive task with a clear finish line, such as triaging a shared inbox into a spreadsheet.
- Write the instructions once and use them in both tools.
- Connect the minimum apps, with read-only access where you can.
- Run 20 real examples and count the ones a person had to fix.
- Price your real volume: executions in n8n, activities in Zapier, credits in Copilot Studio, tokens for the Agents SDK.
- Keep the tool that needed fewer fixes, then add approval steps before widening its access.
If you want a ready-made agent for coding or documents rather than building your own, start with our best AI agents ranking. Small teams can see where agents fit day to day in our AI guide for small business, and developers comparing coding assistants should read the best AI coding tools. Marketing teams automating SEO reports can pair an agent with one of the best AI SEO tools.
Questions people ask
What is an AI agent builder?
A tool for designing your own AI agent: you write its instructions, connect it to apps and data, and set which actions it may take, either visually or in code.
What is the best AI agent builder?
n8n for most technical teams, because it bills per full workflow run from EUR 20 a month and can be self-hosted for free. Zapier Agents is the easiest no-code option.
Is there a free AI agent builder?
Yes. Zapier Agents Free allows 400 activities a month, the n8n Community Edition is free to self-host, and the OpenAI Agents SDK is MIT-licensed open source.
What is the difference between an AI agent and an AI agent builder?
An AI agent is a finished assistant that does work, such as a coding agent. An agent builder is the tool you use to create your own agent for your own workflow.
Is OpenAI Agent Builder being discontinued?
Yes. OpenAI says Agent Builder is scheduled to shut down on 30 November 2026 and points developers to the Agents SDK or ChatGPT Workspace Agents.
How much does Copilot Studio cost?
If you pay for Microsoft 365 Copilot (USD 30 a user a month, yearly), internal agents are included. Beyond that, a standalone pack of 25,000 Copilot Credits runs USD 200 a month.
Can an AI agent builder work without code?
Yes. Zapier Agents and Copilot Studio are built for no-code use, and n8n's visual editor covers most steps, with optional code steps in JavaScript or Python.
Are AI agents safe to connect to company data?
Only with limits. OWASP ranks prompt injection as the top risk for LLM applications, so give agents least-privilege access and require human approval for risky actions.
Sources
- [1]n8n pricing page n8n.io · 1 Nov 2026
- [2]Zapier pricing page zapier.com · 1 Nov 2026
- [3]Copilot Studio pricing page microsoft.com · 1 Nov 2026
- [4]deprecations page developers.openai.com · 1 Nov 2026
- [5]Python SDK repository github.com · 1 Nov 2026
- [6]documentation developers.openai.com · 1 Nov 2026
- [7]Gemini Enterprise page cloud.google.com · 1 Nov 2026
- [8]the most competitive agent completed 30% of tasks autonomously arxiv.org · 1 Nov 2026
- [9]predicted in June 2025 gartner.com · 1 Nov 2026
- [10]prompt injection genai.owasp.org · 1 Nov 2026