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Software · head to head

Alchemy vs Stable Diffusion

Alchemy logo

Alchemy

Software

The web3 development platform

From
Free
Rated
-
Full reviewWebsite
Stable Diffusion logo

Stable Diffusion

Software

Open-source AI image generation

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Alchemy the free tier is capped at 30M compute units a month and 25 requests per second; Stable Diffusion generated images have lower resolution and quality at non-standard dimensions
  • They diverge on capability: Alchemy covers Node APIs, Stable Diffusion covers Text-to-image.

Where they differ

Only the attributes on which Alchemy and Stable Diffusion actually diverge.

Attributes where Alchemy and Stable Diffusion differ
AttributeAlchemyStable Diffusion
Pricing modelfreemiumUnknown
PlatformsApi, WebWeb, Local (GPU-based), Cloud APIs
Founded20172019

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Alchemy

  • Node APIs
  • Enhanced APIs
  • NFT API
  • Webhooks
  • Mempool
  • 35+ chains
  • SDKs

Only in Stable Diffusion

  • Text-to-image
  • Image-to-image
  • Inpainting
  • LoRA support
  • ComfyUI
  • Automatic1111
  • Multiple UIs
  • Local support

Both cover

  • Api support
  • Web support

What people use each for

The jobs each tool is most often brought in to do.

Alchemy

  • Hosted blockchain node access across mainnets and testnetsnot Stable Diffusion
  • Backing a production web3 application without running nodesnot Stable Diffusion
  • Webhook-driven notifications for on-chain eventsnot Stable Diffusion
  • Scaling read throughput beyond self-hosted node limitsnot Stable Diffusion

Stable Diffusion

  • ai tools managementnot Alchemy
  • Workflow automationnot Alchemy
  • Reportingnot Alchemy

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Alchemy

  • The free tier is capped at 30M compute units a month and 25 requests per second
  • Free accounts are limited to 5 apps and 5 webhooks
  • Beyond the free allowance it is $0.45 per 1M compute units for the first 300M a month
  • Request cost varies by call complexity, from around 10 compute units to over 100, so spend is hard to predict from request counts alone
  • Signed SLAs and priority support require an Enterprise contract

Stable Diffusion

  • Generated images have lower resolution and quality at non-standard dimensions
  • Struggles with complex multi-object prompts and text generation
  • Poor rendering of human hands, limbs, and faces due to training data limitations
  • Trained primarily on English-language descriptions, reinforcing Western cultural bias
  • Requires significant GPU computational resources for local deployment

Pricing, plan by plan

Alchemy

Free
  • FreeFree
    • 300M compute units
    • 5 apps
    • Core APIs
  • Growth$49/month
    • 400M compute units
    • 15 apps
    • Enhanced APIs
  • Scale$199/month
    • 1B compute units
    • Unlimited apps
    • Premium support

Stable Diffusion

Free

No published plan breakdown. See the Stable Diffusion review.

Which should you pick?

Choose Alchemy if

  • You need node apis.
  • You want to start without paying.
  • You work on Api, Web.
  • You also want enhanced apis.
Alchemy review

Choose Stable Diffusion if

  • You need text-to-image.
  • You want to start without paying.
  • You work on Web, Local (GPU-based), Cloud APIs.
  • You also want image-to-image.
Stable Diffusion review

Questions people ask

Is Alchemy or Stable Diffusion better?
Neither clearly leads. Alchemy starts at Free and Stable Diffusion at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Alchemy or Stable Diffusion?
Alchemy starts at Free and Stable Diffusion at Free.
Does Alchemy or Stable Diffusion run on more platforms?
Alchemy runs on Api, Web. Stable Diffusion runs on Web, Local (GPU-based), Cloud APIs.
Can I use Alchemy for free?
Both have a free tier, so you can try either at no cost before committing.
What is Alchemy best used for?
Alchemy is most often used for hosted blockchain node access across mainnets and testnets, backing a production web3 application without running nodes, webhook-driven notifications for on-chain events, scaling read throughput beyond self-hosted node limits. Of those, hosted blockchain node access across mainnets and testnets and backing a production web3 application without running nodes are not what Stable Diffusion is typically brought in for.
What can Alchemy do that Stable Diffusion cannot?
Alchemy covers Node APIs, Enhanced APIs, NFT API, Webhooks. Stable Diffusion covers Text-to-image, Image-to-image, Inpainting, LoRA support. Both handle Api support, Web support.

Answered from the vendors’ own pages

Stable Diffusion: Is Stable Diffusion truly free and open-source?

Yes. Stable Diffusion is released under the CreativeML Open RAIL-M license, allowing free use for both commercial and non-commercial purposes, and the code is open-source on GitHub.

Source
Stable Diffusion: Can I use Stable Diffusion commercially for free?

Yes, if your organization has less than $1M annual revenue. Organizations exceeding $1M annually must obtain an Enterprise License from Stability AI.

Source
Stable Diffusion: What are Stable Diffusion's image resolution limitations?

The base model was trained on 512x512 pixel images, and image quality degrades noticeably when deviating from this resolution. Newer models like SDXL support higher resolutions.

Source
Stable Diffusion: Can I run Stable Diffusion locally on my computer?

Yes. Stable Diffusion is open-source and can run locally on compatible hardware, though it requires a GPU for reasonable performance.

Source
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