Plans

Spark, Pro, Premium, Studio.

Name: Darkstar
Brand: Darkstar
Availability: InStock

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

Start Spark Talk to us

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.

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
Hosted Learning Studies unavailable during v2 qualification
Public support contact

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
Hosted Learning Studies unavailable during v2 qualification
Authenticated support tickets

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
Hosted Learning Studies unavailable during v2 qualification
Authenticated support tickets
Save 17% vs the Pro plan

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
Hosted Learning Studies unavailable during v2 qualification
Authenticated support tickets
Save 33% vs the Pro plan

Comparison

Plan limits at a glance

Capability	Spark	Pro	Premium	Studio
Graph size	10 nodes / 15 edges	500 nodes / 1,000 edges	1,500 nodes / 4,000 edges	5,000 nodes / 15,000 edges
Sampling	100 rows/run	1,000 rows/run	5,000 rows/run	10,000 rows/run
Cloud documents	Local files only	25 cloud files	100 cloud files	500 cloud files
Model Discovery	No Model Discovery	25 Model Discovery requests/month	100 Model Discovery requests/month	500 Model Discovery requests/month
Sharing	No sharing	3 invited recipients/share	5 invited recipients/share	Public and invited read-only sharing
Sensitivity	Sensitivity ranking for local models	Sensitivity ranking with saved models	Sensitivity ranking with saved models	Sensitivity ranking with saved models
Influence diagrams	BBN analysis only	BBN analysis only	BBN analysis only	Influence diagrams, policy solving, and VOI
Support	Public support contact	Authenticated support tickets	Authenticated support tickets	Authenticated support tickets
Learn from Data	Hosted Learning Studies unavailable during v2 qualification	Hosted Learning Studies unavailable during v2 qualification	Hosted Learning Studies unavailable during v2 qualification	Hosted Learning Studies unavailable during v2 qualification

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.

Hosted learning is being rebuilt

Learn from Data v1 is retired. Learning Studies v2 remains unavailable while model-family validation, quote-first planning, purchase, execution, and settlement are qualified. No Online plan currently enables paid 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.