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AI · head to head

ElevenLabs vs Stem Athena

ElevenLabs logo

ElevenLabs

AI

AI voice generation and cloning platform

From
Free
Rated
-
Full reviewWebsite
Stem Athena logo

Stem Athena

Energy

AI-driven clean energy optimization

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only ElevenLabs has a free tier, so it costs nothing to try first.
  • Each has a real cost: ElevenLabs number pronunciation errors: '200000' reads as 'twenty thousand thousand' instead of '200,000'; Stem Athena stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired
  • They diverge on capability: ElevenLabs covers Text-to-speech, Stem Athena covers AI optimization.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which ElevenLabs and Stem Athena actually diverge.

Attributes where ElevenLabs and Stem Athena differ
AttributeElevenLabsStem Athena
Starting priceFreeOn request
Pricing modelUnknownsubscription
Free tierYesNo
PlatformsWeb, ApiWeb, Mobile, Api
CategoryAIEnergy
Founded20222009

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 ElevenLabs

  • Text-to-speech
  • Voice cloning
  • 29 languages
  • Emotion control
  • API access
  • Speech-to-speech
  • Dubbing
  • 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.

ElevenLabs

  • ai tools managementnot Stem Athena
  • Workflow automationnot Stem Athena
  • Reportingnot Stem Athena

Stem Athena

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

Where each one falls short

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

ElevenLabs

  • Number pronunciation errors: '200000' reads as 'twenty thousand thousand' instead of '200,000'
  • Voice cloning requires professional-grade audio quality; no upfront guidance on technical requirements
  • Email-only support with 5-14 day response times for complex issues; no phone support
  • Pricing unpredictability: actual usage often exceeds advertised estimates due to regenerations needed for quality

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

ElevenLabs

Free
  • FreeFree
    • 10,000 characters/month
    • 3 custom voices
    • Text-to-speech, speech-to-text access
  • Starter$5/month
    • 30,000 characters/month
    • Commercial license
    • Instant voice cloning
  • Creator$22/month
    • 121,000 characters/month
    • Professional voice cloning
    • Dubbing studio access
  • Pro$99/month
    • 600,000 characters/month
    • Unlimited voice cloning
    • 60-minute extended audio generation

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 ElevenLabs if

  • You need text-to-speech.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want voice cloning.
ElevenLabs 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 ElevenLabs or Stem Athena better?
Neither clearly leads. ElevenLabs starts at Free and Stem Athena at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ElevenLabs or Stem Athena?
ElevenLabs has a free tier; the other does not. Paid plans start at Free for ElevenLabs and On request for Stem Athena.
Does ElevenLabs or Stem Athena run on more platforms?
ElevenLabs runs on Web, Api. Stem Athena runs on Web, Mobile, Api.
Can I use ElevenLabs for free?
Yes. ElevenLabs has a free tier, so you can try it without paying. Stem Athena starts at On request.
What is ElevenLabs best used for?
ElevenLabs is most often used for ai tools management, workflow automation, reporting. Of those, ai tools management and workflow automation are not what Stem Athena is typically brought in for.
What can ElevenLabs do that Stem Athena cannot?
ElevenLabs covers Text-to-speech, Voice cloning, 29 languages, Emotion control. Stem Athena covers AI optimization, Energy storage management, Demand charge reduction, Grid services.

Answered from the vendors’ own pages

ElevenLabs: Does the free plan include commercial usage rights?

No. The free plan provides 10,000 characters monthly and access to 3 custom voices, but excludes commercial license. Commercial usage rights are only available on paid Starter plan ($5/month) and above.

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
ElevenLabs: How many languages does ElevenLabs support?

ElevenLabs supports voice generation in 32+ languages. Professional Voice Cloning (PVC) allows you to create a digital replica of your voice that works across these 32+ languages while maintaining emotional register and prosody.

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
ElevenLabs: What are the requirements for voice cloning?

Professional voice cloning requires high-quality audio with RMS between -23dB to -18dB, no background noise, consistent microphone distance, and proper compression. Without meeting these technical requirements, the cloned voice sounds robotic or distorted. ElevenLabs does not disclose these requirements upfront.

Source
ElevenLabs: How is pricing calculated?

ElevenLabs uses a credit-based system where monthly character limits determine your plan. Free plan has 10,000 characters/month. Starter tier ($5/month) provides 30,000 characters. Creator ($22/month) includes 121,000 credits. Annual billing offers approximately 17% savings (2 free months equivalent).

Source
ElevenLabs: What happens if I exceed my monthly character limit?

Exceeding your monthly quota requires upgrading to a higher plan. Users report pricing unpredictability, with actual usage averaging 220-280 credits per 1,000 characters when accounting for regenerations, often exceeding advertised usage estimates.

Source
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