Plans

Spark, Pro, Premium, Studio.

Start a causal model in Spark without a payment method. Upgrade when the work needs cloud save, larger graph limits, sharing, Model Discovery, Learn from Data, authenticated support, or Studio influence diagrams with VOI analysis.

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Spark is for first work

Build, query, export, and recover first causal graph files without card collection.

Paid plans are for persistence

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

Studio is the decision-analysis tier

Use Studio for influence diagrams, VOI ranking, public links, and the largest limits.

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
  • Sensitivity ranking for local models
  • BBN analysis only
  • No paid learning submissions
  • 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
  • Sensitivity ranking with saved models
  • BBN analysis only
  • Candidate Learn from Data jobs from $24.99/run; 100 datasets
  • 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
  • Sensitivity ranking with saved models
  • BBN analysis only
  • Candidate Learn from Data jobs from $24.99/run; 250 datasets
  • 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, influence diagrams, 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
  • Sensitivity ranking with saved models
  • Influence diagrams, policy solving, and VOI
  • Candidate Learn from Data jobs from $24.99/run; 400 datasets
  • 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
SensitivitySensitivity ranking for local modelsSensitivity ranking with saved modelsSensitivity ranking with saved modelsSensitivity ranking with saved models
Influence diagramsBBN analysis onlyBBN analysis onlyBBN analysis onlyInfluence diagrams, policy solving, and VOI
SupportPublic support contactAuthenticated support ticketsAuthenticated support ticketsAuthenticated support tickets
Learn from DataNo paid learning submissionsCandidate Learn from Data jobs from $24.99/run; 100 datasetsCandidate Learn from Data jobs from $24.99/run; 250 datasetsCandidate Learn from Data jobs from $24.99/run; 400 datasets

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.

Learning jobs are separate

Learn from Data submissions produce candidate causal structures and parameters. Runs are quoted in-app and paid before execution; Online plans do not include free learning runs.

Need help choosing?

Choose Spark for a first local causal graph, Pro for individual cloud work, Premium for heavier saved analysis, and Studio when influence diagrams, VOI ranking, public read-only sharing, and larger self-service limits are part of the work.