Comparison
CompleteFlow vs Harvey AI
Harvey AI is the fastest-growing legal AI platform, used by 42% of AmLaw 100 firms. CoCounsel from Thomson Reuters has reached 1 million users. Both are cloud-only. For law firms where client data cannot leave the building, that's a problem CompleteFlow solves.
TL;DR
The short version
Harvey and CoCounsel are strong legal AI tools. Harvey excels at document analysis and due diligence. CoCounsel is grounded in Westlaw content for legal research. Both process data through third-party cloud infrastructure. Both are locked to the legal vertical. Both create dependency on content subscriptions (LexisNexis or Westlaw).
CompleteFlow deploys on your own infrastructure, works across your entire business and is not limited to the tasks it's been trained to do. No third-party content subscriptions required.
At a Glance
Three-way comparison
| Dimension | CompleteFlow | Harvey AI | CoCounsel |
|---|---|---|---|
| Deployment | ✓ Your infrastructure (Azure, AWS, on-prem) | Azure cloud (SaaS) | Cloud (SaaS) |
| Data sovereignty | ✓ Full. Data never leaves your environment | Data processed on Harvey's Azure infrastructure | Data processed through Thomson Reuters + OpenAI |
| Industry scope | ✓ Legal, insurance, finance, asset management | Legal only | Legal only |
| Workflow automation | ✓ Idempotent workflow engine, rerunnable without duplication | Legal-specific workflows and playbooks | Guided legal workflows |
| Content dependency | ✓ Works with your own data and knowledge bases | Requires LexisNexis integration for full capability | Requires Westlaw subscription for best features |
| Audit trail | ✓ Immutable, compliance-grade, full reasoning traces | Basic data retention controls | Basic data privacy controls |
| Governance | ✓ OPA + Cedar policy engine, approval gates | SOC 2 Type II, ISO 27001 | SOC 2, GDPR |
| Pricing model | ✓ Custom, book a call | ~$500–$1,000/lawyer/month (not publicly listed) | $225/user/month + Westlaw subscription |
| Vendor lock-in | ✓ Open architecture, you own everything | Proprietary + LexisNexis dependency | Deep Thomson Reuters ecosystem dependency |
The Key Question
Where does your client data go?
Harvey AI
Processed on Microsoft Azure. Harvey states they don't train on customer data and offer configurable retention (as short as 3 hours). But data still transits Harvey's infrastructure. For firms with strict SRA data sovereignty requirements or clients who contractually prohibit sending data to third parties, this is a barrier.
CoCounsel
Data processed through Thomson Reuters infrastructure and, for AI features, through OpenAI. The firm does not control the infrastructure their client data touches.
CompleteFlow
- ✓ Deployed on your own Azure, AWS, or on-premises infrastructure.
- ✓ Your encryption keys. Data never leaves your environment.
- ✓ No third-party cloud processing.
- ✓ Full compliance with SRA data sovereignty requirements.
Scope
Beyond legal
Harvey and CoCounsel are excellent at legal tasks. But law firms don't just do legal work. They manage client relationships, handle billing workflows, process compliance documents, and run business operations.
CompleteFlow's workflow engine handles arbitrary business processes, not just legal research. Build agents for contract review, compliance monitoring, client intake automation, regulatory change tracking, matter management, and operational workflows, all governed by the same audit trail and policy engine.
If you need AI across your entire business, not limited to pre-trained legal tasks, a vertical-only tool creates silos.
Which is right for you?
Choose Harvey if…
- → You're an AmLaw 100 firm focused on M&A and transactional work.
- → You're comfortable with cloud-hosted AI processing.
- → You want best-in-class document analysis accuracy (94.8% benchmark).
- → Your clients don't contractually prohibit third-party data processing.
Choose CoCounsel if…
- → Legal research is your primary AI use case.
- → You're already invested in the Westlaw / Thomson Reuters ecosystem.
- → You want the most affordable entry point for legal AI ($225/user/month).
- → Research grounded in authoritative primary law content matters most.
Choose CompleteFlow if…
- → Client data cannot leave your infrastructure (SRA requirements, client contracts).
- → You need AI across legal and business operations, not just research.
- → You want governed workflow automation beyond legal-specific tasks.
- → You need full audit trails with reasoning traces for regulatory review.
- → You want to avoid dependency on LexisNexis or Westlaw subscriptions.
Your clients trust you with their most sensitive data. Your AI should stay just as close.
Book a 30-minute strategy session to discuss your data sovereignty requirements and see the platform in action.
FAQ