Best agent builder

Platforms for wiring LLMs into multi-step automations and agents.

Ranked picks

#1 n8n
Use

#1: per-run (not per-step) pricing, a free self-host option and a huge integration library.

Use this if you want visual workflow automation with AI agent nodes and the option to self-host.

Self-hosted Community Edition free. Cloud Starter €24/mo (€20/mo yearly), 2,500 executions. · verified 2026-10-15
#2 OpenAI Agents SDK
Use

#2: the best code-first option on OpenAI; avoid the visual Agent Builder, which is being deprecated.

Use this if you're a developer building agents in code on OpenAI models.

Open-source SDK; you pay standard API usage. Agent Builder (visual) shuts down Nov 30, 2026. · verified 2026-10-15
#3 Relevance AI
Watch

#3: easy no-code agents, but per-action billing gets expensive quickly compared with n8n.

Use this if you want no-code AI agents for business teams and are OK paying per action.

Free plan (200 actions/mo). Pro $29/mo ($19/mo yearly); Team $349/mo. · verified 2026-10-15

FAQ

What is the best agent builder?

Our #1 pick is n8n. #1: per-run (not per-step) pricing, a free self-host option and a huge integration library.

What's the best alternative?

OpenAI Agents SDK (#2): #2: the best code-first option on OpenAI; avoid the visual Agent Builder, which is being deprecated. Also consider Relevance AI (#3): #3: easy no-code agents, but per-action billing gets expensive quickly compared with n8n.

Is there a free option?

n8n: Self-hosted Community Edition free. Cloud Starter €24/mo (€20/mo yearly), 2,500 executions.
OpenAI Agents SDK: Open-source SDK; you pay standard API usage. Agent Builder (visual) shuts down Nov 30, 2026.
Relevance AI: Free plan (200 actions/mo). Pro $29/mo ($19/mo yearly); Team $349/mo.

How do you rank?

Editorial rankings by capability and reputation, verified 2026-10-15. Paid featured placements never affect rank.