Plans

Spark, Pro, Premium, Studio.

Start in Spark without a payment method. Upgrade when the model needs cloud save, larger graph limits, sharing, Model Discovery, or authenticated support.

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Spark is for first work

Build, query, export, and recover local files without card collection.

Paid plans are for persistence

Cloud documents, autosave, sharing, support, and larger limits unlock by account state.

Studio is the public-sharing tier

Use Studio when unlisted read-only links and the largest self-service limits matter.

Spark

No card

Entry tier

$0

$0 always available

An always-available entry workspace for learning, building, and testing small Bayesian networks.

  • 10 nodes / 15 edges
  • 100 sample rows per run
  • No Model Discovery
  • Local files only
  • No sharing
  • Public support contact

Pro

Monthly billing

$29.99/month

$29.99 charged monthly

Individual authoring with cloud saving, sampling, and invited sharing.

  • 500 nodes / 1,000 edges
  • 1,000 sample rows per run
  • 25 Model Discovery requests/month
  • 25 cloud files
  • 3 invited recipients/share
  • Authenticated support tickets

Premium

Billed every 6 months

$24.99/month

$149.94 charged semi-annually

More room for larger models, more cloud files, and broader invited sharing.

  • 1,500 nodes / 4,000 edges
  • 5,000 sample rows per run
  • 100 Model Discovery requests/month
  • 100 cloud files
  • 5 invited recipients/share
  • Authenticated support tickets
  • Save 17% vs the Pro plan

Studio

Popular

Billed annually

$19.99/month

$239.88 charged annually

Largest self-serve limits, public read-only sharing, and best annual value.

  • 5,000 nodes / 15,000 edges
  • 10,000 sample rows per run
  • 500 Model Discovery requests/month
  • 500 cloud files
  • Public and invited read-only sharing
  • Authenticated support tickets
  • Save 33% vs the Pro plan

Comparison

Plan limits at a glance

CapabilitySparkProPremiumStudio
Graph size 10 nodes / 15 edges 500 nodes / 1,000 edges 1,500 nodes / 4,000 edges 5,000 nodes / 15,000 edges
Sampling100 rows/run1,000 rows/run5,000 rows/run10,000 rows/run
Cloud documentsLocal files only25 cloud files100 cloud files500 cloud files
Model DiscoveryNo Model Discovery25 Model Discovery requests/month100 Model Discovery requests/month500 Model Discovery requests/month
SharingNo sharing3 invited recipients/share5 invited recipients/sharePublic and invited read-only sharing
SupportPublic support contactAuthenticated support ticketsAuthenticated support ticketsAuthenticated support tickets

How upgrades work

Spark does not collect a card. Paid upgrades use Stripe Checkout; Darkstar stores account, subscription, and billing-consent records, not card numbers.

SDKs are separate

Commercial SDK purchases are priced by language, platform, and license rights. Online plans cover the hosted workspace, not SDK redistribution or internal runtime rights.

Need help choosing?

Choose Spark for a first local model, Pro for individual cloud work, Premium for heavier saved analysis, and Studio when read-only sharing and larger self-service limits are part of the work.