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Documentation Index

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Astra 2 is Topaz Labs’ next-generation creative diffusion-based video upscaler, available as a partner node in ComfyUI. Building on Astra 1, it adds expanded control over detail generation and stylization, and transforms AI-generated footage by introducing new dynamic detail and texture with adjustable creativity, sharpness, and prompt-based guidance. Astra 2 performs best on stylized and GenAI sources, as well as wide shots and large-scale scenes where additional detail can be creatively inferred. It enhances clarity, richness, and visual complexity, and is optimized for expressive, stylized workflows.

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Key capabilities

  • Creative detail synthesis — Adds new texture and detail to GenAI sources rather than only sharpening existing pixels.
  • Expanded control — Adjustable creativity and sharpness levels, plus optional prompt-based guidance for precise creative direction.
  • Strong on stylized and wide-shot content — Optimized for stylized, GenAI, and detail-sparse scenes.
To use the API nodes, you need to ensure that you are logged in properly and using a permitted network environment. Please refer to the API Nodes Overview section of the documentation to understand the specific requirements for using the API nodes.
Make sure your ComfyUI is updated.Workflows in this guide can be found in the Workflow Templates. If you can’t find them in the template, your ComfyUI may be outdated. (Desktop version’s update will delay sometime)If nodes are missing when loading a workflow, possible reasons:
  1. You are not using the latest ComfyUI version (Nightly version)
  2. Some nodes failed to import at startup