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Maritime · head to head

Nautilus Labs vs Stem Athena

N

Nautilus Labs

Maritime

AI-powered vessel performance optimization

From
$1000/month
Rated
-
Full reviewWebsite
Stem Athena logo

Stem Athena

Energy

AI-driven clean energy optimization

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Nautilus Labs limited to maritime shipping industry use case, not applicable for other transportation sectors; Stem Athena stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired
  • They diverge on capability: Nautilus Labs covers AI-powered optimization, Stem Athena covers AI optimization.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Nautilus Labs and Stem Athena actually diverge.

Attributes where Nautilus Labs and Stem Athena differ
AttributeNautilus LabsStem Athena
Starting price$1000/monthOn request
PlatformsWebWeb, Mobile, Api
CategoryMaritimeEnergy
Founded20162009

Identical on both: pricing model (subscription), free tier (No), 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 Nautilus Labs

  • AI-powered optimization
  • Emissions tracking
  • Fuel efficiency
  • Performance benchmarking
  • IoT sensors
  • Vessel data recorders
  • Fleet management
  • Web support

Only in Stem Athena

  • AI optimization
  • Energy storage management
  • Demand charge reduction
  • Grid services
  • Solar integration
  • Weather forecasting
  • Performance analytics
  • Remote monitoring

What people use each for

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

Nautilus Labs

No use cases recorded yet. See the Nautilus Labs review.

Stem Athena

  • Energy asset optimization and managementnot Nautilus Labs
  • Renewable energy integrationnot Nautilus Labs
  • Energy storage managementnot Nautilus Labs
  • Grid operations optimizationnot Nautilus Labs

Where each one falls short

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

Nautilus Labs

  • Limited to maritime shipping industry use case, not applicable for other transportation sectors
  • Requires integration with vessel data collection systems for full functionality

Stem Athena

  • Stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired
  • No price, subscription fee or contract term is published anywhere on the site
  • The optimizer is one component of the wider PowerTrack suite alongside separate EMS, SCADA, Power Plant Controller and Logger products rather than a standalone licence
  • Design, procurement, commissioning and operation are sold as managed services separate from the software

Pricing, plan by plan

Nautilus Labs

$1000/month
  • Fleet Platform$3000/month
    • AI optimization
    • Emissions tracking
    • Performance analytics

Stem Athena

On request
  • Commercial$undefined/custom
    • Energy storage optimization
    • Demand charge management
    • Rate optimization
  • Utility$undefined/custom
    • Grid services
    • VPP management
    • Frequency regulation
  • Enterprise$undefined/custom
    • Fleet management
    • Portfolio optimization
    • Custom integrations

Which should you pick?

Choose Nautilus Labs if

  • You need ai-powered optimization.
  • You also want emissions tracking.
Nautilus Labs review

Choose Stem Athena if

  • You need ai optimization.
  • You work on Web, Mobile, Api.
  • You also want energy storage management.
Stem Athena review

Questions people ask

Is Nautilus Labs or Stem Athena better?
Neither clearly leads. Nautilus Labs starts at $1000/month and Stem Athena at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Nautilus Labs or Stem Athena?
Nautilus Labs starts at $1000/month and Stem Athena at On request.
Does Nautilus Labs or Stem Athena run on more platforms?
Nautilus Labs runs on Web. Stem Athena runs on Web, Mobile, Api.
What can Nautilus Labs do that Stem Athena cannot?
Nautilus Labs covers AI-powered optimization, Emissions tracking, Fuel efficiency, Performance benchmarking. Stem Athena covers AI optimization, Energy storage management, Demand charge reduction, Grid services.

Answered from the vendors’ own pages

Nautilus Labs: What does Nautilus Labs do?

Nautilus Labs is a maritime AI platform that optimizes vessel performance and reduces emissions through voyage optimization, real-time prediction, and post-voyage analysis. The platform helps shipping operators improve fuel efficiency and meet decarbonization goals.

Source
Stem Athena: How much does Stem Athena cost?

Stem does not publish pricing for Athena on its website. The company appears to use a custom enterprise pricing model. Interested customers must contact Stem directly through their website to inquire about pricing and availability.

Source
Nautilus Labs: Does Nautilus Labs help with sustainability?

Yes, Nautilus Labs' primary purpose is decarbonization. The platform optimizes ETA, fuel consumption, and CII metrics while providing emission reduction recommendations and vessel maintenance insights to shipping operators.

Source
Stem Athena: Does Stem offer a free trial?

The Stem website does not mention a free trial or demo option for Athena. Customers are directed to contact Stem's sales team for information about trial access or pricing.

Source
Nautilus Labs: Who acquired Nautilus Labs?

Danelec, a Copenhagen-based maritime technology company, acquired Nautilus Labs in November 2023. The platform continues to operate and support customers on existing terms.

Source
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