What Is the Promptus API? Running ComfyUI Workflows Programmatically

Quick answer: The Promptus API lets you run Promptus's CosyTemplates — its library of pre-built ComfyUI workflows for image, video, and audio generation — programmatically, without opening the Promptus app or managing a ComfyUI backend yourself. Point a request at a CosyTemplate, get generation results back.

If you've come across ComfyUI's own Cloud API — which runs workflows on Comfy's cloud infrastructure programmatically, available on their Standard, Creator, and Pro subscription tiers — you're probably looking for a way to automate generation instead of clicking through a UI for every run. Promptus offers the same kind of programmatic access, scoped to its own workflow library.

What the Promptus API Actually Does

Every CosyTemplate in Promptus — the same one-click, pre-configured ComfyUI workflows covered in our Z-Image and ComfyUI Manager guides — is also deployable via API call. That means you can:

How This Differs From Running ComfyUI's Own API

ComfyUI's Cloud API is the officially maintained path if you're already running ComfyUI workflows and want to move execution to Comfy's own cloud infrastructure — it's designed to be a close match to local ComfyUI's API, so existing integrations migrate with minimal changes.

The Promptus API takes a different starting point: instead of assuming you've already built and are maintaining your own ComfyUI workflow, it gives you API access to Promptus's ready-made CosyTemplate library directly. If you'd rather start from a working, pre-built workflow than assemble one node-by-node — the same tradeoff covered in our guide to choosing a beginner platform — the API gives you that same shortcut programmatically.

Getting Access

Sign in or create an account to reach the Promptus API dashboard.