# The Best AI Agent Platforms (2026)

> Source: https://theagentsindex.com/best-ai-agent-platforms (curated, quality-gated, re-verified)

All four of these call themselves an "AI agent platform," but they split on two real axes, not one ranking. n8n and Dify are both open (fair-code and Apache-2.0-derived, respectively) and self-hostable via Docker — n8n started as a visual workflow-automation tool with AI-agent nodes layered on top, so its scope is any automation, not agents specifically; Dify started as an LLM-app platform with a built-in RAG pipeline, so its scope is building and shipping model-backed apps and agents. Lindy and Relevance AI are both closed-source and cloud-only. Lindy is the simplest on-ramp: a no-code builder for single AI "employees" that automate recurring inbox, meeting and CRM busywork. Relevance AI is the more production-grade of the two, purpose-built for orchestrating multi-agent "workforces" with a cost-optimising LLM router, evals, tracing and RBAC/SSO.

One pattern is worth weighing across all four before you commit: n8n's Cloud tiers and Dify's Cloud tiers both publish flat monthly or annual prices. Lindy and Relevance AI both meter usage in credits instead, and that metering has a real, documented cost: independent reviews repeatedly flag Lindy's overage charges as a billing surprise, and Relevance AI's own dual "Actions plus Vendor Credits" meter is easy to misjudge on AI-heavy agents (its pricing page now foregrounds a custom Enterprise quote over self-serve numbers). None of that makes the credit-metered platforms worse — Relevance AI in particular ships production controls the flat-rate pair does not — but it means the real cost of scaling up is a question worth modelling before you buy, not just the number on the pricing page.

| # | Name | What it is | Pricing | API |
| --- | --- | --- | --- | --- |
| 1 | [n8n](https://theagentsindex.com/n8n.md) | Source-available workflow automation with native AI-agent nodes, self-hostable and integration-rich. | Free | Yes |
| 2 | [Dify](https://theagentsindex.com/dify.md) | Open-source, visual platform for building production LLM apps and agents, self-host it or run it in the cloud. | Free | Yes |
| 3 | [Lindy](https://theagentsindex.com/lindy.md) | An AI executive assistant you text over iMessage or SMS, built on a no-code agent platform still available underneath. | $49.99 / month | — |
| 4 | [Relevance AI](https://theagentsindex.com/relevance-ai.md) | Build and run an "AI workforce", teams of no-code agents that do real sales, ops and research work. | Free | Yes |

## Methodology

Every entry is a Published listing that already cleared this site's per-listing quality gate — sourced facts, admitted weaknesses, a "best for" and a "not for," re-verified on a rolling cadence (see /methodology). agent-platforms (Build group) clears the same 4-listing minimum as the four Agents-group rankings above, and — unlike coding-agents and frameworks — was never named as already-adequately-covered by the flagship grouping alone, so this is a genuine, previously unbuilt gap rather than a revisit of a settled call. Sierra also carries the agent-platforms tag but is excluded here: it is a vertical customer-support product, already ranked as the lead entry of /best-ai-support-agents, not a general-purpose agent-building platform. The ordering runs open-and-automation-first (n8n), through open-and-app/RAG-first (Dify), to closed-and-simplest (Lindy), to closed-and-most-production-grade (Relevance AI), grouped around the openness and pricing-predictability splits described above rather than a single "best overall" pick, since the four serve different jobs. The live score chip on every card (evidence, honesty, depth, freshness) is computed the same way as that tool's own listing page.