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Developer Tools · head to head

Restate vs ThetaRay

Restate logo

Restate

Developer Tools

Durable execution engine in Rust with a free tier and low-latency workflows

From
Free
Free plan
Yes
Full reviewWebsite
ThetaRay logo

ThetaRay

Cybersecurity

Unsupervised AI transaction monitoring for cross-border and correspondent banking

From
On request
Free plan
No
Full reviewWebsite

The short version

  • Only Restate has a free tier, so it costs nothing to try first.
  • Each has a real cost: Restate the runtime is under a Business Source Licence rather than an open source licence, so building a competing managed offering on it is prohibited and some procurement functions will reject it on licence grounds alone.; ThetaRay unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
  • They diverge on capability: Restate covers Durable execution, ThetaRay covers Unsupervised detection.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Restate and ThetaRay actually diverge.

Attributes where Restate and ThetaRay differ
AttributeRestateThetaRay
Starting priceFreeOn request
Pricing modelPer month by durable action countquote
Free tierYesNo
PlatformsLinux, macOS, WebWeb
CategoryDeveloper ToolsCybersecurity

Identical on both: user rating (Not yet rated).

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 Restate

  • Durable execution
  • Virtual objects
  • Single binary runtime
  • Multi-language SDKs
  • Workflows and sagas
  • Restate Cloud

Only in ThetaRay

  • Unsupervised detection
  • Cross-border focus
  • Sanctions screening
  • Alert triage
  • Customer risk scoring
  • Cloud native

What people use each for

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

Restate

  • Payment or order flows where a crash between two external API calls must not double-charge or lose the ordernot ThetaRay
  • AI agent loops that call tools over minutes or hours and must survive a deployment mid-runnot ThetaRay
  • Replacing hand-rolled retry, idempotency key and outbox code across a set of microservicesnot ThetaRay
  • A small team that wants durable workflows without operating a Temporal cluster and its databasenot ThetaRay

ThetaRay

  • A correspondent bank that cannot see the ultimate originator and needs behavioural signals rather than counterparty listsnot Restate
  • A cross-border payments fintech whose rules engine produces more alerts than its compliance team can clearnot Restate
  • A bank under a regulatory consent order needing demonstrable improvement in detection within a fixed periodnot Restate
  • A payment institution entering a high-risk corridor where existing thresholds were calibrated on domestic trafficnot Restate

Where each one falls short

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

Restate

  • The runtime is under a Business Source Licence rather than an open source licence, so building a competing managed offering on it is prohibited and some procurement functions will reject it on licence grounds alone.
  • Restate Cloud jumps from a free fifty thousand actions straight to 300 US dollars a month for twenty million, so a workload sitting at a few hundred thousand actions pays enterprise-shaped money for hobby-shaped volume.
  • It is a young project against Temporal’s established base, so hiring engineers who already know it is unrealistic and the answer to most questions is in the docs rather than on Stack Overflow.
  • The programming model requires structuring code around durable handlers and virtual objects, which is a genuine rewrite for existing services rather than a library you add.
  • The single-binary simplicity that makes small deployments cheap also means fewer operational knobs at very large scale than a system designed as separable components.

ThetaRay

  • Unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
  • The alert reduction claim depends heavily on your data, so a parallel run is essential and adds months and cost before you can decommission the incumbent.
  • Coverage is strongest in cross-border and correspondent flows; institutions whose risk is domestic retail fraud will find the fit weaker than a general-purpose monitoring platform.
  • It is a smaller vendor than the incumbents, so integration connectors into legacy core banking systems are often bespoke work rather than a supported adapter.
  • Model retraining and tuning are vendor-led, which means changing detection behaviour is a support conversation rather than something your own analysts can do that afternoon.

Pricing, plan by plan

Restate

Free
  • FreeFree
    • Fifty thousand durable actions per month
    • No credit card required
    • Community support
  • Starter$300/month
    • Twenty million actions per month
    • Two hundred actions per second, bursting to one thousand
    • Twenty GB storage
  • Pro$1000/month
    • Fifty million actions per month
    • Five hundred actions per second, bursting to two thousand
    • Fifty GB storage
  • Enterprise$undefined/year
    • Negotiated volume
    • Twenty-four seven P0 support
    • 99.99 per cent SLA

ThetaRay

On request
  • ThetaRay Sonar$undefined/year
    • Priced by monitored transaction volume and number of monitored entities
    • SaaS on Azure with regional data residency options
    • Parallel run and model tuning included in onboarding

Which should you pick?

Choose Restate if

  • You need durable execution.
  • You want to start without paying.
  • You work on Linux, macOS, Web.
  • You also want virtual objects.
Restate review

Choose ThetaRay if

  • You need unsupervised detection.
  • You also want cross-border focus.
ThetaRay review

Questions people ask

Is Restate or ThetaRay better?
Neither clearly leads. Restate starts at Free and ThetaRay at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Restate or ThetaRay?
Restate has a free tier; the other does not. Paid plans start at Free for Restate and On request for ThetaRay.
Does Restate or ThetaRay run on more platforms?
Restate runs on Linux, macOS, Web. ThetaRay runs on Web.
Can I use Restate for free?
Yes. Restate has a free tier, so you can try it without paying. ThetaRay starts at On request.
What is Restate best used for?
Restate is most often used for payment or order flows where a crash between two external api calls must not double-charge or lose the order, ai agent loops that call tools over minutes or hours and must survive a deployment mid-run, replacing hand-rolled retry, idempotency key and outbox code across a set of microservices, a small team that wants durable workflows without operating a temporal cluster and its database. Of those, payment or order flows where a crash between two external api calls must not double-charge or lose the order and ai agent loops that call tools over minutes or hours and must survive a deployment mid-run are not what ThetaRay is typically brought in for.
What can Restate do that ThetaRay cannot?
Restate covers Durable execution, Virtual objects, Single binary runtime, Multi-language SDKs. ThetaRay covers Unsupervised detection, Cross-border focus, Sanctions screening, Alert triage.

Answered from the vendors’ own pages

Restate: Is Restate open source?

The SDKs are MIT. The runtime is under a Business Source Licence, which permits self-hosting but not offering it as a competing service.

ThetaRay: Does it replace a rules engine entirely?

Rarely on day one. Most institutions run it alongside existing rules during a parallel period, and some keep specific regulator-mandated rules permanently.

Restate: How does it compare with Temporal?

Same problem, different shape: one Rust binary with embedded storage instead of a server plus database plus workers, and lower per-step latency.

ThetaRay: Where is the data processed?

SaaS runs on Microsoft Azure with regional deployment options, which is the mechanism for meeting data residency conditions in regulated markets.

Restate: Is there a free tier?

Yes, fifty thousand durable actions a month on Restate Cloud with no card required.

ThetaRay: Is sanctions screening included?

Screening is available on the same platform but licensed as part of the commercial package rather than bundled by default. Confirm it is in your quote.

Restate: Which languages are supported?

TypeScript, Java, Kotlin, Go, Python and Rust.

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