---
title: Comparisons
description: How the Workflow SDK compares to other durable execution, workflow, and AI-agent frameworks — Temporal, Cloudflare Workflows, AWS Step Functions, AWS Bedrock AgentCore, Inngest, and trigger.dev.
type: overview
summary: Side-by-side comparisons of the Workflow SDK against Temporal, Cloudflare Workflows, AWS Step Functions, AWS Bedrock AgentCore, Inngest, and trigger.dev.
related:
  - /docs/foundations/workflows-and-steps
  - /docs/how-it-works/event-sourcing
  - /worlds/vercel
---

# Comparisons



The Workflow SDK overlaps with several categories: durable execution engines, background-job platforms, managed orchestrators, and AI-agent runtimes. This section compares it against the most common alternatives, one deep dive per tool.

## What makes the Workflow SDK different

* **It's an open-source SDK, not a hosted product.** Your workflows are plain TypeScript in your existing app. Run them on the managed [Vercel World](/worlds/vercel), or self-host on the [Postgres World](/worlds/postgres) — the [World abstraction](/worlds/building-a-world) lets you own and swap the storage, queue, and streaming layers independently.
* **Versioning is safe by default.** Runs are pinned to the immutable deployment that started them, so shipping new code never disturbs in-flight runs. Upgrading a run is explicit and opt-in. See [Versioning](/docs/comparisons/workflow-sdk-vs-temporal#versioning).
* **Realtime durable streaming is built in.** Stream partial output (LLM tokens, progress) to clients with [streams](/docs/foundations/streaming) that survive reconnects, cold starts, and replays — essential for chat and agent UIs.
* **First-class AI agents.** `WorkflowAgent` ships inside the [AI SDK](/docs/ai), turning an agent loop into a durable workflow with automatic step retries and human-in-the-loop pauses.

## Snapshot

<Callout type="info">
  These comparisons are compiled from each product's public documentation and are **not** based on head-to-head benchmarks — durable engines differ enough that a single number rarely compares cleanly. Treat them as directional and verify current pricing and limits against each vendor's docs.
</Callout>

| Tool                                                                           | Category                           | Durability model                           | Open source / self-host                            | Language(s)                           |
| ------------------------------------------------------------------------------ | ---------------------------------- | ------------------------------------------ | -------------------------------------------------- | ------------------------------------- |
| **Workflow SDK**                                                               | Durable functions SDK              | Event-log + deterministic replay           | ✅ Apache-2.0 — self-host (Postgres) or Vercel      | TypeScript (Python beta)              |
| [Temporal](/docs/comparisons/workflow-sdk-vs-temporal)                         | Durable execution platform         | Event-sourced replay                       | ✅ MIT server — self-host or Temporal Cloud         | Go, Java, TS, Python, .NET, PHP, Ruby |
| [Cloudflare Workflows](/docs/comparisons/workflow-sdk-vs-cloudflare-workflows) | Durable execution engine           | Step-result memoization + replay           | ❌ Cloudflare-only                                  | TypeScript (Python beta)              |
| [AWS Step Functions](/docs/comparisons/workflow-sdk-vs-aws-step-functions)     | Managed state-machine orchestrator | Declarative ASL state machine              | ❌ AWS-only                                         | ASL JSON (tasks: any language)        |
| [AWS Bedrock AgentCore](/docs/comparisons/workflow-sdk-vs-aws-agentcore)       | AI-agent hosting platform          | Not durable execution (ephemeral sessions) | ❌ AWS-only                                         | Python, Node.js                       |
| [Inngest](/docs/comparisons/workflow-sdk-vs-inngest)                           | Durable functions / event platform | Step-result memoization                    | ◑ SSPL — self-host (community/best-effort) or SaaS | TypeScript (Python/Go pre-1.0)        |
| [trigger.dev](/docs/comparisons/workflow-sdk-vs-trigger-dev)                   | Durable task platform              | Process checkpoint/restore (CRIU)          | ✅ Apache-2.0 — self-host or Cloud                  | TypeScript only                       |

## Deep dives

<Cards>
  <Card href="/docs/comparisons/workflow-sdk-vs-temporal" title="vs Temporal">
    The mature, language-agnostic durable-execution platform. You run the workers; Workflow SDK runs in your app.
  </Card>

  <Card href="/docs/comparisons/workflow-sdk-vs-cloudflare-workflows" title="vs Cloudflare Workflows">
    A durable engine on Workers + Durable Objects. Both replay; they handle versioning and encryption very differently.
  </Card>

  <Card href="/docs/comparisons/workflow-sdk-vs-aws-step-functions" title="vs AWS Step Functions">
    Declarative ASL JSON state machines vs. plain TypeScript control flow.
  </Card>

  <Card href="/docs/comparisons/workflow-sdk-vs-aws-agentcore" title="vs AWS Bedrock AgentCore">
    An AI-agent hosting platform — not a durable-execution engine. Different axis.
  </Card>

  <Card href="/docs/comparisons/workflow-sdk-vs-inngest" title="vs Inngest">
    Event-driven durable functions that run on your own infra over HTTP.
  </Card>

  <Card href="/docs/comparisons/workflow-sdk-vs-trigger-dev" title="vs trigger.dev">
    A TypeScript task platform that achieves durability by snapshotting the process (CRIU).
  </Card>
</Cards>

<Callout type="info">
  Moving an existing system over? Each deep dive includes a concept-mapping section, and the Workflow SDK migration skill can translate code for you:

  ```bash
  npx skills add https://github.com/vercel/workflow --skill migrating-to-workflow-sdk
  ```
</Callout>


---

For a semantic overview of all documentation, see [/sitemap.md](/sitemap.md)

For an index of all available documentation, see [/llms.txt](/llms.txt)

For agent-facing discovery, including API and MCP surfaces, see [/agents.md](/agents.md)