agentFast vs LangGraph: What's the Difference?
agentFast and LangGraph are not competitors — they operate at different layers. LangGraph is an orchestration SDK: it decides what your agent does next. agentFast is the production layer built on top of it: memory, tools, observability, guardrails, human-in-the-loop, and evals. You don't choose between them. You use LangGraph through agentFast, and get the production plumbing for free.
Side by side
| LangGraph | agentFast | |
|---|---|---|
| What it is | Orchestration framework (free, OSS) | Production layer + working agents (source-available) |
| Control flow / graphs | ✓ (its core strength) | Uses LangGraph for this |
| Memory (vector + episodic) | Bring your own | ✓ Included |
| 50 MCP tools | Bring your own | ✓ Included |
| Observability dashboard | Bring your own | ✓ Included |
| Guardrails (PII, safety, rate limits) | Bring your own | ✓ Included |
| Durable human-in-the-loop | Primitives only | ✓ Included + UI |
| Evals in CI | Bring your own | ✓ Included |
| Working reference agents | Templates only | ✓ Support, Research, Code |
So do you need agentFast if you have LangGraph?
If you're happy spending two to four weeks building the production layer yourself, no — LangGraph plus your own plumbing gets you there. agentFast exists because that plumbing is nearly identical on every agent, and rebuilding it each time is the tax we got tired of paying. You keep writing real LangGraph. You stop rebuilding everything around it.
Not sure LangGraph is even the right SDK for you? Read LangGraph vs CrewAI vs a vanilla loop — agentFast supports all three, so the choice stays yours.
agentFast is the production layer — memory, 50 tools, observability, evals, guardrails, human-in-the-loop — for LangGraph, CrewAI, the Claude & OpenAI Agent SDKs & Vanilla. Own it for life.
Get agentFast — from $89