ElevenLabs (Agents Platform) vs Sierra
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Sierra is the stronger AI pick in AI Agents: it has a visibility score of 1.5 versus 1.2 for ElevenLabs (Agents Platform).
Choose ElevenLabs (Agents Platform) if…
- You need FedRAMP 20x Class A coverage
- free-forever plan with monthly character allowances
- free custom voices for experimenting with voice agents
Choose Sierra if…
- You want the brand AI engines rank higher (1.5 vs 1.2)
AI visibility side by side
Latest weekly run · Nov 3
| Metric | ElevenLabs (Agents Platform) | Sierra |
|---|---|---|
| Visibility score | 1.2% | 1.5% |
| Change vs last week | New | New |
| Rank in AI Agents | #57 | #49 |
| Share of voice | 0.3% | 0.5% |
| Mentions this run | 2 | 3 |
| Positive in AI answers | — | 33% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
ElevenLabs (Agents Platform) 0pp · Sierra 0pp over 0 weekly runs.
Engine by engine
Sierra leads on 3 of 3 engines
Head to head in AI answers
0 engine answers name both brands
Features, pricing & fit
| Dimension | ElevenLabs (Agents Platform) | Sierra |
|---|---|---|
| Pricing model | Flat tiers | — |
| Entry price | Free; paid from $6 / mo | — |
| Free plan | Yes | — |
| Deployment | — | Managed and forward-deployed, with no self-serve option. |
| Compliance | FedRAMP 20x Class A | — |
| Support | Priority support on the Enterprise plan, Talk to sales | — |
| Founded | 2022 | 2024 |
| Headquarters | London, United Kingdom | San Francisco, California, United States |
| Employees | 1,001–5,000 | 1,001–5,000 |
| Funding | Series A · $781M raised | Series E, led by Tiger Global and GV |
| Best for | Businesses that want to run customer support, sales and other conversational AI agents in production | Businesses that want customer service AI agents across chat and voice, built by customer experience teams with or without engineering support. |
Plans side by side
ElevenLabs (Agents Platform)
Sierra
Pricing not available.
Pros and cons
Themes from the AI answers that mention each brand
ElevenLabs (Agents Platform)
- free-forever plan with monthly character allowances
- free custom voices for experimenting with voice agents
Sierra
Profile in progress.
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “ElevenLabs (Agents Platform) vs Sierra”, https://slateindex.ai/compare/elevenlabs-agents-platform-vs-sierra, data of Nov 3, 2026. Licence: CC BY 4.0.