Is there a ComfyUI alternative that runs in the browser?
Yes — hosted node-graph platforms offer the same compositional model without a local install or a GPU to maintain. The trade is real in both directions: you give up custom nodes, sampler-level control and self-hosting, and you gain commercial models already wired in, no environment to break on update, and API access. Which side wins depends on whether the ecosystem or the maintenance is what you value.
What carries over conceptually
The node-graph way of thinking transfers directly: stages as nodes, outputs feeding inputs, the whole pipeline saved and reused. What does not transfer is any graph file itself, since hosted platforms have their own node sets rather than importing ComfyUI JSON. Plan on rebuilding rather than migrating, and expect the rebuild to be quick because the hard part — knowing which stages you need — is already done.
What you give up
ComfyUI’s custom node ecosystem is genuinely large, and a hosted platform will have a fixed node set maintained by its operator. Sampler internals, LoRA loading and low-level parameters are generally not exposed. If a specific community node or a locally trained model is load-bearing for your work, staying local is the correct decision, not a failure of nerve.
What you gain
Commercial models — the ones with no open weights to download — become callable by name alongside open ones, which is not possible in a purely local setup without wiring each vendor API yourself. There is no environment to maintain, no GPU to provision, and no breakage when a dependency updates. Hosted platforms also tend to ship API and agent access, so pipelines can be triggered from your own product.
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