HazelJS vs CrewAI
TL;DR
- CrewAI is a Python-first multi-agent framework: Crews (role-based collaboration) and Flows (event-driven orchestration), with checkpointing, flow persistence (
@persist), human input patterns, and optional CrewAI Enterprise deploy. - HazelJS Agent OS is TypeScript-native: durable agents inside the same DI/HTTP app as your APIs, with DNA packaging, Skillgate, Gatekeeper, crash-safe HITL, and local
hazel apply/hazeld. - Prefer CrewAI when Python crews/flows and their ecosystem are the center of gravity.
- Prefer HazelJS when TypeScript backend teams need Agent OS primitives beside REST — clone Meridian.
Sources: CrewAI checkpointing, CrewAI production architecture. Unofficial TypeScript ports exist but are not the primary CrewAI product.
Who this is for
Teams comparing Python multi-agent crews to a TypeScript Agent OS for product agents.
Capability matrix
| Capability | HazelJS | CrewAI |
|---|---|---|
| Language | TypeScript / Node | Python (primary) |
| Primary abstraction | Agent OS (DNA + AgentRuntime + local control plane) | Crews + Flows |
| Agent runtime | @hazeljs/agent AgentRuntime | Agent / Crew / Flow runtimes |
| Workflow orchestration | AgentGraph, supervisor, @hazeljs/flow | Flows with branching and state |
| Durable execution | DurableRunStore, leases, crash-safe HITL | Checkpointing + @persist flows |
| Governance | Skillgate capability curation | Crew/task config + enterprise patterns |
| Authorization | Gatekeeper allow/deny/require-approval | Task/tool policies + human input (model differs) |
| Observability | Timelines, inspector, optional OTel | Tracing / CrewAI observability |
| Deployment | Local-first hazeld + hazel apply; cloud optional | Self-host or CrewAI Enterprise |
| Multi-agent | Graphs, supervisor, @Delegate, A2A | Crews, hierarchical process, delegation |
| Human-in-the-loop | Durable HumanTask + Gatekeeper approvals | Human input / flow suspend patterns |
| Production infrastructure | Same DI app as HTTP APIs | Flow-first production guidance + enterprise |
Cells marked by product docs at the time of writing. Where CrewAI enterprise-only features apply, treat them as platform options — not as gaps HazelJS automatically fills.
When to choose which
Choose CrewAI when your org standardizes on Python agents, crew role patterns, and CrewAI Flows/Enterprise.
Choose HazelJS when agents must ship as TypeScript services with DNA versioning, OpenAPI→Skillgate tools, and Gatekeeper authorization next to Nest-familiar controllers.
Related
FAQ
- Is CrewAI available in TypeScript?
- CrewAI’s primary product is Python. Unofficial community TypeScript ports exist; they are not the official CrewAI stack. HazelJS is TypeScript-first.
- Does CrewAI support durable execution?
- Yes — CrewAI documents checkpointing and flow persistence (@persist). HazelJS uses DurableRunStore, leases, and crash-safe HITL inside Agent OS.
- When should I pick HazelJS over CrewAI?
- When TypeScript backend teams need DNA packaging, Skillgate-governed REST tools, Gatekeeper authorization, and agents in the same DI app as HTTP APIs.
- When should I pick CrewAI?
- When Python crews/flows and the CrewAI ecosystem (including optional Enterprise) are your standard.