Relativity aiR vs CoCounsel: E-Discovery AI Compared

Relativity aiR and CoCounsel are both enterprise legal AI platforms, but they solve completely different problems. Relativity aiR is a document review and e-discovery platform — privilege detection, key document identification, and large-scale review acceleration. CoCounsel is a legal research and multi-task assistant — Westlaw-grounded research, contract analysis, and deposition prep.

This is not a head-to-head competition. It is a budget allocation decision for litigation-heavy firms. Relativity aiR reduces document review costs. CoCounsel reduces legal research time. Both add to existing platform dependencies — Relativity to RelativityOne, CoCounsel to Westlaw. The question is which bottleneck costs your firm more.

Feature Comparison

Relativity aiR offers AI-powered document review, privilege detection, key document identification, sentiment analysis across document sets, and AI-generated review summaries. It processes massive document volumes — millions of documents in e-discovery matters. It operates within the RelativityOne ecosystem.

CoCounsel offers legal research with Westlaw citations, document review, contract analysis, deposition preparation, and timeline creation. It handles multi-step legal tasks grounded in the Thomson Reuters database.

Relativity aiR is a document processing tool — it works at scale across thousands or millions of documents. CoCounsel is a legal reasoning tool — it works on individual tasks with higher analytical depth. Relativity aiR finds the needle in the haystack. CoCounsel analyzes the needle.

Pricing and Cost

Relativity aiR is part of RelativityOne with per-GB pricing for hosting plus AI features. Enterprise contracts. Costs scale with data volume — a large e-discovery matter with terabytes of data generates significant hosting and processing fees.

CoCounsel costs an estimated $100-200/seat/month on top of existing Westlaw subscriptions. Seat-based pricing regardless of usage volume.

The pricing models reflect the use cases. Relativity costs more when you process more data. CoCounsel costs the same whether attorneys use it heavily or barely at all. For litigation firms with frequent large-scale discovery, Relativity's per-GB model can be substantial. For research-heavy firms, CoCounsel's seat model creates adoption pressure.

Data Privacy and Compliance

Relativity aiR is FedRAMP authorized, SOC 2 Type II certified, and HIPAA compliant. This is the highest security bar among legal AI tools — necessary because e-discovery data includes privileged communications, medical records, and trade secrets.

CoCounsel operates under Thomson Reuters enterprise data agreements. No training on queries. Enterprise-grade security.

Relativity aiR has the stronger security posture — FedRAMP authorization and HIPAA compliance are not typical for legal AI platforms. This reflects the sensitivity of e-discovery data. CoCounsel's security is adequate for legal research but does not require the same level because research queries are less sensitive than document contents.

Best For

Choose Relativity aiR if your firm handles large-scale document review and e-discovery. The AI features reduce reviewer hours on massive document sets — privilege detection alone can save thousands of hours on a major matter. Best for firms already on RelativityOne.

Choose CoCounsel if your firm's primary AI need is legal research and multi-task assistance. Citation-grounded research, contract analysis, and deposition prep cover the analytical side of litigation. Best for firms already on Westlaw.

Litigation-heavy firms need both at different stages. Relativity aiR for the document-intensive discovery phase. CoCounsel for the research-intensive briefing and trial prep phases. They do not overlap.

The Verdict

Relativity aiR and CoCounsel are not alternatives — they are sequential tools in the litigation workflow. Discovery comes first (Relativity). Research and analysis come second (CoCounsel). Firms choosing between them should ask: where do we spend more attorney hours? If document review eats your budget, Relativity aiR delivers ROI. If research and drafting consume the hours, CoCounsel does. Enterprise firms doing both need both.

The Bottom Line: Relativity aiR for document-heavy discovery, CoCounsel for research-heavy analysis — different stages of litigation, not competing tools.