Multi-agent orchestration platform from Japan — TRINITY model + finance underwriting agents.
ツール利用メモリRAGマルチエージェント
Demo · hover to playLegora vs Sierrawhich AI research agent should you pick in 2026?
Collaborative legal AI agents for due diligence, contract review, and drafting.
Tool useMemoryRAGMulti-agent
Legora vs Sierra — specs
| Spec | Legora | Sierra |
|---|---|---|
| Agent Rank | 58 / 100 (B) | 78 / 100 (A) |
| Autonomy | Semi-autonomous | Autonomous |
| Pricing | Subscription | Subscription · Free tier |
| Open source | No | No |
| Capabilities | Tool use, Memory, RAG, Multi-agent | Voice, Tool use, Memory, RAG |
| Integrations | 4 apps | 3 apps |
| Verified | — | Verified |
| Released | Aug 2025 | Feb 2025 |
Agent Rank breakdown
Legora
Agent Rank
58/ 100
- 自律性
- 8
- 機能
- 8
- 連携
- 2
- 料金
- 4
- 完成度
- 7
- 検証性
- 6
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
Legora
メリット
- +$5.55B valuation Series D Apr 2026 — largest legal-AI Series D in history
- +Multi-agent collaboration (different agents for different transaction types)
- +Strong UK/EU foothold with Magic Circle firm adoption
デメリット
- −Newer than Harvey in US market — fewer NYC AmLaw 100 case studies
- −Enterprise pricing only — no associate-level self-serve
- −Best suited for transactional law (M&A, finance) — less for litigation
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
Legora
Standard
カスタム
Boutique firms
- +Contract review agent
- +Due diligence
- +Word + SharePoint
おすすめ
Enterprise
カスタム
Mid + large firms
- +Multi-agent workflows
- +iManage/NetDocs sync
- +Advanced security
Sovereign
カスタム
Magic Circle
- +EU/US/UK data residency
- +BYO LLM option
- +Dedicated tenants
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?
Sierra
Pick Sierra if cost is the main constraint or if you want the highest autonomy and the verification loop is in place.
Try Sierra →Affiliate links. We may earn a commission at no extra cost to you.
Frequently asked
Should I pick Legora or Sierra in 2026?+
Pick Legora if its specific capabilities (Tool use, Memory) match what you need. Pick Sierra if cost is the main constraint or if you want the highest autonomy and the verification loop is in place. Most working teams running both can use Legora for primary work and Sierra for the workflows where its specific strengths matter.
What's the price difference between Legora and Sierra?+
Legora starts at Subscription; 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, Legora or Sierra?+
Sierra is the more autonomous of the two (Autonomous vs Semi-autonomous). Higher autonomy ships throughput faster but requires verification loops in place — see our autonomous-vs-copilot framing for when each tier wins.
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Multi-agent super-agent with built-in AI phone module — research, slides, sheets, real-world calls.
ブラウザ操作ツール利用音声メモリGemini に内蔵された長時間稼働のリサーチ機能で、計画立案・ウェブ閲覧・ブリーフ作成を行います。
ブラウザ操作RAGメモリビジョン
Demo · hover to play
See more alternatives: alternatives to Legora · alternatives to Sierra
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