AI-powered contract review is one of the most mature categories in legal tech. But with multiple strong options on the market, choosing the right tool can be overwhelming. Here's a practical breakdown.
The Landscape
Contract review AI falls into two broad camps: standalone platforms (purpose-built for contract analysis) and features within larger suites (like Clio's AI or Westlaw's CoCounsel). We're focusing on the standalone tools here.
Luminance
Best for: Large firms and corporate legal departments handling high-volume due diligence.
Luminance uses proprietary legal-specific LLMs (not just fine-tuned general models) trained on billions of legal documents. The standout feature is AI negotiation — Luminance can actually draft and propose redlines based on your firm's playbook. Supports 80+ languages, which makes it the clear choice for cross-border transactions.
Pricing: Enterprise only. Expect $50K+ annually for a mid-size deployment.
Ironclad
Best for: In-house legal teams managing the full contract lifecycle.
Ironclad is less about deep clause-level analysis and more about workflow automation. Their AI drafts contracts from templates, routes them for approval, tracks negotiations, and manages execution. The Salesforce integration is particularly strong for commercial contracts tied to deals. If your bottleneck is contract turnaround time rather than review depth, Ironclad is likely the better fit.
Pricing: Starts around $5,000/year for small teams.
Kira Systems (Litera)
Best for: Firms that need highly customizable extraction models.
Kira's strength is its machine learning approach to clause extraction. The platform ships with 100+ pre-built extraction models, but the real power is training custom models on your firm's specific clause libraries. This makes it ideal for firms with specialized practice areas or non-standard contract types. Widely used for lease abstraction and M&A due diligence.
Pricing: Volume-based enterprise pricing.
How to Choose
Ask yourself three questions:
- Volume: Are you reviewing hundreds of contracts per month, or dozens?
- Workflow: Do you need just review, or the full lifecycle (draft → negotiate → sign → manage)?
- Customization: Do your contracts follow standard patterns, or are they highly specialized?
High volume + review focus → Luminance. Full lifecycle → Ironclad. Custom extraction → Kira Systems.
For smaller firms just getting started with AI contract review, consider starting with a general-purpose AI like Claude, which can handle contract analysis through its long context window without the enterprise price tag.