コード不要の音声 AI ビルダー — コードを書かずに電話エージェントを設計、デプロイ、監視できます。
音声ツール利用メモリ
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ElevenLabs vs Sierrawhich AI support agent should you pick in 2026?
AI voice platform with Conversational Agents — production-grade voice cloning, TTS, and voice agents.
VoiceTool useMemory
ElevenLabs vs Sierra — specs
| Spec | ElevenLabs | Sierra |
|---|---|---|
| Agent Rank | 82 / 100 (A) | 78 / 100 (A) |
| Autonomy | Autonomous | Autonomous |
| Pricing | Freemium · from $5 | Subscription · Free tier |
| Open source | No | No |
| Capabilities | Voice, Tool use, Memory | Voice, Tool use, Memory, RAG |
| Integrations | 4 apps | 3 apps |
| Verified | Verified | Verified |
| Released | Feb 2025 | Feb 2025 |
Agent Rank breakdown
ElevenLabs
Agent Rank
82/ 100
- 自律性
- 9
- 機能
- 6
- 連携
- 6
- 料金
- 8
- 完成度
- 10
- 検証性
- 10
自律性、機能、連携、料金、成熟度、編集部の検証を基に自動算出。デプロイごとに更新されます。 どのように算出されているか?
Sierra
Agent Rank
78/ 100
- 自律性
- 9
- 機能
- 8
- 連携
- 6
- 料金
- 9
- 完成度
- 5
- 検証性
- 10
自律性、機能、連携、料金、成熟度、編集部の検証を基に自動算出。デプロイごとに更新されます。 どのように算出されているか?
Pros & cons
ElevenLabs
メリット
- +Best voice quality and most natural TTS in any consumer-grade product
- +Conversational AI agents now match Parloa and Sierra on quality at lower price
- +Custom voice cloning works with 30 seconds of source audio
デメリット
- −Conversational Agents product is newer than the TTS product — less polish
- −Pricing tiers can be confusing across TTS + Voice Agents + Dubbing
- −Voice cloning controls require careful consent handling
Sierra
メリット
- +Best-in-class for branded customer-facing agents (voice + chat parity)
- +Concierge onboarding from one of the strongest teams in AI
- +Indistinguishable-from-human quality in tier-1 deployments
デメリット
- −Enterprise-only pricing — typical contracts $150–500k/year
- −Deployment is white-glove, not SaaS — multi-week setup
- −Overkill for SMB or mid-market support volumes
Pricing
ElevenLabs
Free
無料
Trial
- +10K characters/mo
- +Watermarked
Starter
$5/月
Hobbyists
- +30K characters/mo
- +Voice cloning
おすすめ
Creator
$22/月
Creators
- +100K characters/mo
- +Higher quality models
- +Conversational AI 1K min
Pro
$99/月
Professionals
- +500K characters/mo
- +Studio tier voice clones
Scale
$330/月
Teams
- +2M characters/mo
- +Multi-seat workspace
Sierra
おすすめ
Branded agent
カスタム
Enterprise
- +Voice + chat
- +Custom persona
- +White-glove implementation
- +SOC 2 II + HIPAA option
Which one should you pick?
ElevenLabs
Pick ElevenLabs if its specific capabilities (Voice, Tool use) match what you need.
Try ElevenLabs →Affiliate links. We may earn a commission at no extra cost to you.
Frequently asked
Should I pick ElevenLabs or Sierra in 2026?+
Pick ElevenLabs if its specific capabilities (Voice, Tool use) match what you need. Pick Sierra if cost is the main constraint. Most working teams running both can use ElevenLabs for primary work and Sierra for the workflows where its specific strengths matter.
What's the price difference between ElevenLabs and Sierra?+
ElevenLabs starts at Freemium · from $5; Sierra starts at Subscription · Free tier. Sierra is the cheaper entry option. For team deployments the TCO can differ — use the AI Agent Rank TCO calculator for your specific volume.
Which is more autonomous, ElevenLabs or Sierra?+
Both ElevenLabs and Sierra are Autonomous agents — neither has a meaningful autonomy advantage over the other. The decision should hinge on capabilities and pricing instead.
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Adjacent agents in the same category with overlapping capabilities — worth a side-by-side glance before you commit.
本番環境向け音声AIエージェントインフラ — スケール可能なインバウンド、アウトバウンド、IVR代替AIエージェントを構築できます。
音声ツール利用メモリ本番環境対応の音声エージェントプラットフォーム — 低遅延ストリーミングと分単位料金を備えた LLM ネイティブの電話エージェント。
音声ツール利用メモリDemo · hover to play
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