Relativity vs Casetext CoCounsel (Thomson Reuters)
AI Legal Tools pricing comparison · 2026
Relativity pricing ranges from $500–$25000/month, while Casetext CoCounsel (Thomson Reuters) ranges from $225–$900/user/month. Casetext CoCounsel (Thomson Reuters) is typically 90% more affordable, though your actual cost depends on tier and team size.
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Relativity and Casetext CoCounsel (Thomson Reuters) both operate in the ai legal tools category. This page compares their list pricing.
Plan-by-Plan Pricing
| Plan | Relativity | Casetext CoCounsel (Thomson Reuters) |
|---|---|---|
| RelativityOne Pay As You Go | Free | $225 /user/month |
| RelativityOne Flex Commit (1-Year) | Free | $500 /user/month |
| RelativityOne Flex Commit (3-Year) | Free | $900 |
Cost at Scale
Total cost of ownership — licenses, implementation, and hidden costs included.
Relativity
6 scenarios$1,250
Boutique Litigation Firm (50GB active data)
$2,500/month for data hosting (50GB x $25-$50/GB). Add $1,750 for initial processing (50GB x $35/GB, one-time per matter). No per-user fees. Total annual cost for steady-state hosting: $15,000-$30,000 plus per-matter processing charges.
$7,500
Mid-Size Corporate Legal Department (500GB, Flex Commit)
$12,500/month ($90,000-$150,000/year) for committed data hosting at discounted rates. Early case assessment data at 33% rate saves $20,000-$40,000/year. Processing costs: $17,500 per 500GB collection (one-time per matter). Total first-year cost: $107,500-$207,500 depending on matter volume.
$50,000
Global Law Firm (5TB, 3-Year Flex Commit)
$100,000/month ($600,000-$1,200,000/year) for committed high-volume hosting with deepest discounts. Cold storage for archived matters at 25% rate provides significant savings. Processing costs: $175,000 per 5TB collection. Total annual cost: $775,000-$1,375,000 including estimated processing, plus potential third-party service provider markups of 20-50%.
Casetext CoCounsel (Thomson Reuters)
3 scenarios$2,700/year ($225/month)
Solo Attorney — Annual Subscription
$6,000/year ($500/month)
Small Firm — Annual Subscription + Supplemental Research
for CoCounsel + estimated $900–$1,500/year per attorney for supplemental research
Custom pricing; comparable enterprise Westlaw seats reported at ~$900/month per seat
Enterprise — Custom-Quoted
Contract Terms
| Term | Relativity | Casetext CoCounsel (Thomson Reuters) |
|---|---|---|
| Auto-renewal | — | Yes |
| Cancellation | — | — |
| Minimum commitment | 3 years for volume discount pricing | Annual (based on published annual pricing structure) |
| Price escalation | Volume commitments forced to increase year over year | Historical 'locked in for life' promotional pricing was not honored after Thomson Reuters acquisition; users report expectations of significant uplift at next renewal to align with Westlaw/Lexis tier pricing |